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An analysis on the status of Tomato Yellow Leaf Curl disease

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Tomato yellow leaf curl disease (TYLCD) was reported firstly in tomato (Solanum esculentum) fields, association with outbreaks of the whitefly Bemisia tabaci, in the late 1930s in Jordan valley. Since 1960s, TYLCD has become the most destructive disease of tomato throughout the world. Tomato crops are severely affected by TYLCD and 93-100% yield losses have been recorded in some cases. Infected tomato plants have a few, small fruits and in some cases, flower abscission resulted to the loss of fruits. The viral nature of the disease agent and its transmission with whitefly was proved in 1964. The disease viral agent was then identified and named tomato yellow leaf curl virus (TYLCV) and its genome sequence was determined in the late 1980s. TYLCV is a member of the genus Begomovirus in the family Geminiviridae, which includes the viruses transmitted by the whitefly B. tabaci. In Iran TYLCD was first detected in tomato fields from two provinces (Hormozgan and Sistan-Baluchestan) in the south, in 1990. Thereafter, during one decade, the disease was reported from many other provinces such as Kerman, Khuzestan, Bushehr, Markazi, Isfahan, Tehran, Golestan, Mazandaran, Yazd and Khorasan-Razavi. TYLCD has now become a major agent of tomato yield reduction in the Iranian tomato fields.
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  
    
         
 
               
):     : (

     (Tomato Yellow Leaf Curl Disease, TYLCD)         
(Bemisia tabaci)    (Solanum esculentum)           
                  .      TYLCD 
              .          
     .                     
.  TYLCD      (B. tabaci)         .   
 TYLCD          )Tomato yellow leaf curl virus, TYLCV (    
           . TYLCV     (Geminiviridae)   
 (Begomovirus) . TYLCD               
                     
                         .
  :   TYLCV.
An analysis on the status of Tomato Yellow Leaf Curl disease
K. BANANEJ
Iranian Research Institute of Plant Protection, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran
Abstract
Tomato yellow leaf curl disease (TYLCD) was reported firstly in tomato (Solanum esculentum) fields, association with outbreaks of the
whitefly Bemisia tabaci, in the late 1930s in Jordan valley. Since 1960s, TYLCD has become the most destructive disease of tomato
throughout the world. Tomato crops are severely affected by TYLCD and 93-100% yield losses have been recorded in some cases. Infected
tomato plants have a few, small fruits and in some cases, flower abscission resulted to the loss of fruits. The viral nature of the disease agent
and its transmission with whitefly was proved in 1964. The disease viral agent was then identified and named tomato yellow leaf curl virus
(TYLCV) and its genome sequence was determined in the late 1980s. TYLCV is a member of the genus Begomovirus in the family
Geminiviridae, which includes the viruses transmitted by the whitefly B. tabaci. In Iran TYLCD was first detected in tomato fields from two
provinces (Hormozgan and Sistan-Baluchestan) in the south, in 1990. Thereafter, during one decade, the disease was reported from many
other provinces such as Kerman, Khuzestan, Bushehr, Markazi, Isfahan, Tehran, Golestan, Mazandaran, Yazd and Khorasan-Razavi.
TYLCD has now become a major agent of tomato yield reduction in the Iranian tomato fields.
Key words: Tomato, TYLCV, virus.
Corresponding author: k_bananej@yahoo.com
         
   
    (  ) 
 
       
          
     
)
Anonymous, 2016
.(
  
    
Fig. 1.
Status of field tomato cultivation in Iran
)(

) ( 
  
    
Fig. 2.
Status of greenhouse tomato cultivation in Iran
)(

)  ( 
  :
         
    
 

    

(    

) (  
 
)  (  
 
)  .(  
 
   
     


(  ) (

(  )  (
  
     
     

/ )

) (  
 
/ )
  
   
  
    . 
 
 / 
  )  
  
    

.    
  
    
 
( )/  (
 
(  )/   (
  
/ 
  
/   
 
     
  
  
 
   /  
   
 ) 
   
.(
 

          
     

  
Status of field tomato cultivation in Iran


)/(

  
Status of greenhouse tomato cultivation in Iran
 
)/(


 
    
  

   )

     :

) (
 
)  (
 
  
 
)  (  
     
  : )

 )

 ) .(
  
  
/   .
    

(   /

/ )  (
 
 (  .
  
    
  
/
 
)/  (  
   ( 
  
/   

   
  
   )/
 
 )/
 
  .  
  
/
  
/   
 
  . /
  
  
 
)/  (
   

  
) (
Fig. 3.
The area under cultivation of tomatoes (field) in each province (2014)

(
Fig. 4.

.       
     
 .  
 
      
     

  
     
(Diaz-
Pendon
.      
       
         

       
.   
    
   )  
    
(    
 
 
     ) (
  
The area under cultivation of tomatoes (field) in each province (2014)
    ) (   )

Fig. 4.
The tomato production (field) in each province (2014)

 
TYLCD

        
   
       
 .  
        

        
 
   
    
     
    
    
  
)  .( 
      
    
       
    
   

     

 
 
     

  
Pendon
et al., 2010)
       

         
       
    
    
  .
     : 
 
 
   :

        
       
        

        
    .
 
    

    
   
  
      
       
         
TYLCV
  
Fig. 5.
Leaves symptoms on infected tomato by TYLCV
Topocuvirus
Becurtovirus
Turncurtovirus

(Varsani et al., 2014)
.   
 
   
    
   

.     
  

(Bipartite)

  
      
Padidam
.(     
   

(Whiteflies)
   
(
Gemini
     
  
   
TYLCD
  
(Monopartite)
   
Tomato yellow leaf curl Thailand virus
 
Tomato yellow leaf curl Kanchanaburi virus
  
(Bipartite)
 .  
TYLCV
/
(Diaz-Pendon et al
., 2010)
.
 
(Recombination)
    
  
TYLCV
   
  :
         

           
TYLCV
Leaves symptoms on infected tomato by TYLCV
in Varamin and Behbahan
areas
    
 

Begomovirus

Geminiviridae

(Lazarowitz, 1991)
.
        
         
  
 )
(TYLCV
 
       
)  (  
(
Rybicki, 2015
.    
        
(TYLCD)
Diaz-Pendon et al
., 2010; Lefeuvre
 
    

 )
circular single-
   
 
(geminate)

 ×   
.
    
(genome organization)
   

(insect vector)
 

:
Mastrevirus
Curtovirus
Begomovirus
Topocuvirus
Eragrovirus

 
    
(Monopartite)


  
 
  
)
Padidam
et al., 1995
   

Gemini
viridae)

  
  

Tomato yellow leaf curl Thailand virus
Tomato yellow leaf curl Kanchanaburi virus

(Bipartite)
 
., 2010)
 

  



areas
  : 
)
(TYLCV
 
 
  
Geminiviridae
        

         

  
       

Rybicki, 2015
; Scholthof et al., 2010)
        
   )
., 2010; Lefeuvre
et al.,
2010
(.  
 
   
stranded DNA
( 
   
)  (  

 
(Lazarowitz, 1991)
.
 
(genome organization)
(host range)
  

   

     :     

       )Garcia-Andres et
al., 2007(.        
      )TYLCV-IR, Acc. No.
Aj132711(      )Intergenic
region(    )Tomato leaf curl Iran virus, Acc.
No. AY29792 ((Behjatnia et al., 2004)    
 ) (  )TYLCV-Mid, Acc. No. X76319(
 (Bananej et al., 2004).
      
(B. tabaci) )  (        
        
)dicotyledonous ( )Van Regenmortel et al., 2000 .(
  : TYLCV   
          
    .    
          
TYLCV  (Czosnek, 2007) . 
(S. esculentum)     TYLCV . 
      S. chilense
S. habrochaitesS. peruvianum S. pimpinellifolium
       .
 -a     × -b        ) (
     ) (-c  B. tabaci
(Czosnek, 2008)
Fig. 6. a- Twin bodies with size 30×20 nm b- symptoms of infection with TYLCV in tomato plant (left)
and healthy tomato (Right) c- B. tabaci
the insect vector of TYLCV(Czosnek, 2008)
        Maize streak virus, MSV http://www.sciencedirect.com/science/book/9780123846846)(
Fig. 7. Electron microscope image of Maize streak virus, MSV (http://www.sciencedirect.com/science/book/9780123846846)
  :         

  (Phaseolus vulgaris) 
)Petunia hybrida (  )Eustoma grandiflorum(
 TYLCV         
      .  
        Datura stramonium
Cynonchum acutum       
    Malva parviflora   
   .      
      (Gossypium hirsutum)
 (Solanum melongea)      
.    (Datura stramonium)  
       .  
  Nicotiana benthamiana tabacum
.
N 
          
           
       (infectious clone)
   .(Czosnek, 2008)
 TYLCV      
(Capsicum annuum)  )  (   
(Shirazi et al., 2008)   (Cucumis sativus)   
)Melilotus officinalis(  (Dacus sp.)  
(Trigonella sp.)  (Malva sp.)   
(Shirazi et al., 2010).        
      (Phaseolus vulgaris) 
(Cucumis sativus)       
(Physalis alkekenge)   (Malva sylvestris)  
 (Heliotropis sp.)   (Chenopodium album)
 (Solanum nigrum)   )Echinochloa crus-
galli(           
  (Azadvar et al., 2016).
  :    
         
TYLCV   .     
        
       
  .TYLCV     
         . 
TYLCV       
    . TYLCV    
           
       
  .      
      
 .   TYLCV    
Guangxi   .     
    TYLCV    
Tomato yellow leaf curl Sardinia virus  
(TYLCV-Sar)  (TYLCV-Sic)   
  .         
 TYLCV       
  . TYLCV      
        .    
       
 .      
        
   .      
           
) (    .   TYLCV 
         
         
      .    
             
      .   
  TYLCV      
     :     

          
       .   
   TYLCV     
        .   
       TYLCV 
          
          TYLCV
   ) (    
    .(Czosnek, 2008)
   TYLCD   :
 (TYLCD)       
         
       
(Hajimorad et al., 1993) .    
  :     
       
(TYLCD)         
         
    )Hajimorad et al., 1996 .(
     TYLCD   
))(Shahriary and Bananej, 1997(   
)(  )(  )(  
) (  )    ( )Bananej
et al., 2003a; Bananej et al., 1998(  ) 
      
 ((Malekzadeh et al., 2008; Malekzadeh et al., 2011)
)       ( )Vahdat
et al., 2008(  ) ( )Bananej et al., 2009 ( 
.
    :  
    Tomato leaf curl Palampur virus
(ToLCPMV)        
 ) (   )Hessari et al., 2010(.
 :   )B. tabaci (     
          
    Misra and Lamba, 1929) (   
      )  Antarctica ( 
  )Martin et al., 2000 .(     
         
        
 )B. tabaci (  )Anderson and
Morales, 2005 .(   )B. tabaci (     
         
Aleyrodes tabci )Gennadius, 1889 (    
B. tabaci   )Russell, 1957 .( 
B. tabaci           
)Jones, 2003 (         
     )Navas-Castillo et al.,
2011 .( B. tabaci       
        . 
          
    .       
     )Crawler (      
         .   
  )      (   
           . 
        )Ghanim
and Czosnek, 2016(.
  TYLCV    B. tabaci
  (Persistent)   .B. tabaci 
         
         
 .         
   .    
  :         

        . 
             . 
           
    .       
              
  .         
          
    (Gerling and Mayers, 1996) . 
       TYLCV 
    .     
(Acquisition access period, AAP)   
(Inoculation access period, IAP)    
TYLCV  B      
   )Cohen and Harpaz, 1964; Mansour and
Al-Musa, 1992; Mehta et al., 1994.(
        
(AAP)    .     
        
            
      (latent period) 
 .         
     .    
 ) (   
    )   (   
  (Ghanim et al., 2001) .  
  TYLCV      
.        
            .
TYLCV          
  (Head)   .    
  (Esophgus)    (Midgut)
           
        .   
         
(Hindgut)    .  TYLCV 
         
.       
    (Midgut)      
     AAP  .     
         
        . 
          
GroEL       
         
.TYLCV  /         
  (Salivary gland, SG)   .
       (APP)  
(SG)         
    (SG)     
    .    
           
. TYLCV    
         
         
(Czosnek, 2008). (Gender)  (Age)  
      .      
           
          
  .    TYLCV 
      .   
          
          
  .       
      .     
     :     

       
           
           . 
          
   .    (TYLCSV)  
 (AAP)         
    (AAP)      . 
    (Viruliferous)   
    (Non-viruliferous) 
     .    
           
(Fertility)    . TYLCV  
           
    )Rubinstein and Czosnek, 1997;
Czosnek 2007.(
    :   )B. tabaci ( 
          
(Kiriukhin, 1947)         
       
      .   
(Habibi, 1975; Javanmoghadam, 1993).   
         
ITS1 ..       
         B
   .      
..   RAPD-PCR    H16
  B       Cv
   (Shahbazi et al., 2010) .   
    B  B. tabaci   
  (Rajaei Shoorcheh et al., 2008).
 
    
   :    
          
            
    .    
          
    TYLCV   
   .      
          
          
 TYLCV  (Jafari et al., 2010) . 
         )  
   (        
          
       
(Azadvar et al., 2016).
   :    
          .
          
         .  
         
)Polstone and Lapidot, 2007(
.
  
         
         .
          
         
           
           .
         
          . 
         
          
        )Ioannou,
  :         

1987( .     (Cynanchum acutum) 
        
          
   (Cohen et al., 1988) .  
     TYLCV    
  .         
     .     
         
          
 (Czosnek, 2007) .     
        
        
      )Azadvar et al.,
2016(.
  :      
  (Cucumis sativus)     
           
          
       
            
       (Al-Musa, 1982) .
          
  )   (  ) 
 (        
        
         
         
          
     )Bananej et al., 2003b .(
         
          
  (B. tabaci)    
          
(Czosnek, 2007).
 :      
          
(B. tabaci)        
)  (         
TYLCV   .        
      .    
          
     .     
          
    .         
       
(Berlinger et al., 1991) .      
          
        .  
          
         
           
        . 
          
           
          
          
    )Bananej et al., 2003b .(
  :      
      .    
       
          
        .  
           
     (Dobson, 1994) . 
     :     

           
      .     
         
(Mellor et al., 1997).      
           
 .(Selinger et al., 1994)   ) 
  (        . 
  Trialeurodes vaporariorum  
          
        
          )Coombe,
1982( .   (B. tabaci)    
           
        
 (Mound, 1962) .    
          
     (TYLCV) 
 (Cohen and Berlinger, 1986) .   
         
           
     )Cohen and Melamed-Madjar,
1978( .         
          . 
         
           
           .
        
 (Squash leaf curl begomovirus, SLCV)   
   .       
         
  (Antignus et al., 2005) .  
          
           . 
           
      .      
 UV      )UV-blocking
polyethylene films, UV-BPF(     
  .         
         
       . 
   UV-BPF    
         
         
          
   .        
(UV-BPF)         
TYLCV        .  
          
TYLCV      UV  
         
          
     (UV-BPF)    
        
    .      
          
       (UV-BPF)   
    (Antignus et al., 1996).
   :     
            
 TYLCV .       
          
       .   
       TYLCV  
           .  
  :         

  TYLCV     
            
         
     TYLCV   
(Czosnek, 2007) .
  
            
      .    
         
             
                
       )Perring et al.,
1999 .(   )TYLCV(    
    (Chlorinated hydrocarbons)
 (Organophosphates)  
(Neonicotinoids) (Pyridine-Azomethines)
 (Pyrethroides)     
     .    
        
         
.            
          
)Polstone and Lapidot, 2007 .(   
        
        (Leafminers)
  .(Rafie et al., 1999)    
)B. tabaci (        
  )TYLCV (     .
             
         
      )Sharaf, 1986 .(
     )Neonicotinoids ( 
          .
   )Thiomethoxam, Imidaclipride
Dinotefuron(       
  )TYLCV (     
   (Ahmed et al., 2001) . Bumblebee
        
  .         
         
   (Zaks, 1997) .       
           
   )Byrne et al., 2003 .(    
           
         
           
      )Czosnek, 2007.(
         
        :   
        
        
         
       :
       
         )  
 (       
        
            
      .
          
          
       .
 )Whitefly (       
    .       
     :     

          
   .
        .
         
     TYLCV   . 
             
   .     
         
 .
        
         .
      )TYLCV (  
  .
         
   .
         
    )       
(.
        
 .
     .
       
        .
        
.
   )bait plants (  .
        
         .
        
         .
          
       .
     TYLCV.
 
      
TYLCD       
      )    (
           
 B. tabaci        
         
 .         
(Recombination)      
           
      .    
         
         
        
   .       
        
        
  .          
         
           
 .        
  TYLCD       
          
          
  .          
        
TYLCD         
.
  :         

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
... The disease symptoms include stunting, yellowing, reducing number and size of fruits, leaf rolling, leaf cupping, and yellowing of the leaf margin. Symptoms are more severe when plants are infected in early growth stages (Fig. 14.1; Diaz -Pendon et al. 2010;Bananej 2016). TYLCV, a causal agent of the disease, is considered as one of the ten most economically important plant viruses in the world (Rybicki 2015). ...
... The infected host plants exhibited the typical TYLCV symptoms, although in some cases no symptom was present. The analysis on the virus isolates tested indicated the absence of DNA-B component or DNAβ (Shahriary and Bananej 1997;Bananej et al. 1998aBananej et al. , 2003aBananej et al. , 2009Fazeli et al. 2009;Pakniat et al. 2010;Hosseinzadeh and Garivani 2014;Shirazi et al. 2014;Azadvar et al. 2016;Bananej 2016;Yazdani-Khameneh et al. 2016). ...
... 1 I A maximum-likelihood (ML) tree indicating the relationships between the full-length genomes of Iranian and worldwide isolates of Tomato yellow leaf curl virus (TYLCV). Twelve recombination events resulting in ten recombination patterns are shown in the right of the tree; sequences derived from TYLCV and non-TYLCV sources are indicated with green color and other colors, respectively; II an ML tree showing the relationships between the full-length genomes of variants of the virus strains from Iran and nearby geographical locations and other parts of the world; III symptoms associated with TYLCV infections on tomato (Reproduced fromLefeuvre et al. 2010;Bananej 2016) ...
Book
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Begomoviruses are one of the most interesting plant viruses to study for basic and applied research as they cause huge economic losses to agriculture industries and farmers all over the world. They belong to family Geminiviridae and are emergent plant viral pathogens which cause diseases in various crops in the tropical and subtropical regions. They are transmitted by the whitefly (B. tabaci) and have either one (monopartite DNA-A) or two (bipartite DNA-A and DNA-B) genomic components. DNA-A and DNA-B are of ~2600 - 2800 nucleotides each. A number of serious diseases of cultivated crops of the Fabaceae, Malvaceae, Solanaceae and Cucurbitaceae families are caused by Begomoviruses which are considered as threat to their cultivation in many countries. Accurate diagnosis is important for successful diseases management, since plants infected by Begomovirus do not recover, suffer serious yield losses and act as further sources of inoculum, which is then picked up and spread by their vector whitefly (B. tabaci). Reports of occurrence of new viruses and re-emergence of several known viruses in new niches have become regular event. In such a dynamic system, growth of several crop species relies on an accurate diagnosis, management and better understanding of the biology of the casual virus. This is crucial to evolve appropriate control practices and to prevent the virus infection. Researchers have achieved considerable progress in characterization, detection and management of virus on different crop species in the last decade. This book covers latest information in diagnosis of begomoviruses in the present scenario and explores the new vistas in the field of genomics and proteomics. Chapters in Section 1 illustrates the occurrence, genome organisation, transmission and diagnostics of begomoviruses. It also details the diseases caused by begomoviruses on different crops, detection techniques and management strategies in support of research findings by presentation of data, graphics, figures and tables. Section 2 is a chapterwise collection of occurrence, diversity and status of begomoviruses in Asian Africa counties where the diseases are most prevalent. This book will provide wide opportunity to the readers to have complete information and status of begomovirus in Asia and Africa. This will be useful resource for researchers and extension workers involved in the begomvirus disease diagnosis and molecular biology. Expert detection, accurate diagnosis and timely management play a significant role in keeping plants free from pathogens. In this book expert researchers share their research knowledge and literature which are vital towards the diagnosis of begomoviruses, addressing traditional plant pathology techniques as well as advanced molecular diagnostic approach. The book deals with the economically important crops including fruits, vegetables along with challenges in crop protection against diseases caused by begomovirus. This will be resourceful and handy for researcher, practitioners and also students. © Springer Nature Singapore Pte Ltd. 2017. All rights reserved.
... The disease symptoms include stunting, yellowing, reducing number and size of fruits, leaf rolling, leaf cupping, and yellowing of the leaf margin. Symptoms are more severe when plants are infected in early growth stages (Fig. 14.1; Diaz -Pendon et al. 2010;Bananej 2016). TYLCV, a causal agent of the disease, is considered as one of the ten most economically important plant viruses in the world (Rybicki 2015). ...
... The infected host plants exhibited the typical TYLCV symptoms, although in some cases no symptom was present. The analysis on the virus isolates tested indicated the absence of DNA-B component or DNAβ (Shahriary and Bananej 1997;Bananej et al. 1998aBananej et al. , 2003aBananej et al. , 2009Fazeli et al. 2009;Pakniat et al. 2010;Hosseinzadeh and Garivani 2014;Shirazi et al. 2014;Azadvar et al. 2016;Bananej 2016;Yazdani-Khameneh et al. 2016). ...
... 1 I A maximum-likelihood (ML) tree indicating the relationships between the full-length genomes of Iranian and worldwide isolates of Tomato yellow leaf curl virus (TYLCV). Twelve recombination events resulting in ten recombination patterns are shown in the right of the tree; sequences derived from TYLCV and non-TYLCV sources are indicated with green color and other colors, respectively; II an ML tree showing the relationships between the full-length genomes of variants of the virus strains from Iran and nearby geographical locations and other parts of the world; III symptoms associated with TYLCV infections on tomato (Reproduced fromLefeuvre et al. 2010;Bananej 2016) ...
Chapter
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The family Geminiviridae primarily constitutes an important family of circular single-stranded DNA (ssDNA) plant-infecting viruses, which pose severe constraints in agricultural production globally and serious threat to food security in sub-Saharan Africa. There are seven known genera, Mastrevirus, Begomovirus, Curtovirus, Becurtovirus, Eragrovirus, and Turncurtovirus of viruses belonging to the family Geminiviridae. Of these, the best characterized economically important species belong to the genus Begomovirus. Begomovirus species are either monopartite (possessing only DNA-A) or bipartite (having both DNA-A and DNA-B components). Majority of the monopartite begomoviruses also have subviral ssDNA satellite components, called DNA α or DNA β. In some cases, defective interfering DNAs can be found in the helper virus due to deletions of some genomic parts associated with bipartite and monopartite begomoviruses. New begomoviral species and their associated subviral components continue to emerge globally, thereby, constituting a formidable challenge to the profitable production of vegetables and other crops. Key begomoviruses associated with major crops in Nigeria are documented in this review.
... The disease symptoms include stunting, yellowing, reducing number and size of fruits, leaf rolling, leaf cupping, and yellowing of the leaf margin. Symptoms are more severe when plants are infected in early growth stages (Fig. 14.1;Diaz-Pendon et al. 2010;Bananej 2016). TYLCV, a causal agent of the disease, is considered as one of the ten most economically important plant viruses in the world (Rybicki 2015). ...
... The infected host plants exhibited the typical TYLCV symptoms, although in some cases no symptom was present. The analysis on the virus isolates tested indicated the absence of DNA-B component or DNAβ (Shahriary and Bananej 1997;Bananej et al. 1998aBananej et al. , 2003aBananej et al. , 2009Fazeli et al. 2009;Pakniat et al. 2010;Hosseinzadeh and Garivani 2014;Shirazi et al. 2014;Azadvar et al. 2016;Bananej 2016;Yazdani-Khameneh et al. 2016). ...
... . 14.1 I A maximum-likelihood (ML) tree indicating the relationships between the full-length genomes of Iranian and worldwide isolates of Tomato yellow leaf curl virus (TYLCV). Twelve recombination events resulting in ten recombination patterns are shown in the right of the tree; sequences derived from TYLCV and non-TYLCV sources are indicated with green color and other colors, respectively; II an ML tree showing the relationships between the full-length genomes of variants of the virus strains from Iran and nearby geographical locations and other parts of the world; III symptoms associated with TYLCV infections on tomato (Reproduced fromLefeuvre et al. 2010;Bananej 2016) ...
Chapter
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The diverse climatic conditions, high-grade and fertile soil, and potential access to water resources have provided favorable platform for the extensive cultivation of different crops in Iran and subsequently proper conditions for the activity of a variety of plant viruses, including members of the genus Begomovirus. Several mono- and bipartite begomoviruses have been reported to infect various crops in the country; some of them seem to be new species/strains. Widespread occurrence and high economic impacts of a number of Begomovirus species across the country have been well documented. In recent years, reports of the natural occurrence of these viruses from new regions/hosts in Iran have been significantly increased. This is mainly because of the suitable climate conditions (especially in the southern areas), presence of various host plants, high activity of whitefly vectors in climatically different regions, and emergence of pesticide-resistant whitefly populations. Moreover, neighboring with some countries where a broad range of genetically variable begomoviruses exist and the presence of common hosts to different begomoviruses, that favor mixed infections and recombination events, have made Iran as a center for diversification of these viruses. These aspects, coupled with global warming, which possibly provides appropriate environmental conditions for both viruses and vectors in other regions of the country, show the serious and continuous threats of begomoviruses in the mid-Eurasia of Iran and indicate the necessity to develop new strategies for their efficient control.
... TYLCV virus was also detected in other plant species such as cucumber (Cucumis sativus), pepper (Capsicum annuum), alfalfa (Medicago sativa), cowpea (Vigna unguiculata), cantaloupe (Cucumis melo var. cantalupensis), and red pepper (Capsicum sp.) (Hosseinzadeh and Garivani 2014;Azadvar et al. 2016;Bananej 2016). Five strains of TYLCV have been identified in Iran including TYLCV-IL, TYLCV-IR, TYLCV-Bou, TYLCV-Ker, and TYLCV-OM. ...
Chapter
Geminiviruses (family: Geminiviridae) are plant pathogenic viruses with single-stranded DNA (ssDNA) genome. Geminiviruses are classified into nine genera: Begomovirus, Mastrevirus, Curtovirus, Becurtovirus, Topocuvirus, Turncurtovirus, Capulavirus, Grablovirus, and Eragrovirus. Begomoviruses constitute the largest number of viruses in Geminiviridae family infecting most economically important crops in Australia, China, Europe, and the Middle East countries. Crops that have been infected with begomoviruses belong to the families, Malvaceae (cotton and okra), Cucurbitaceae (melon, watermelon, squash, and gourds), Euphorbiaceae (cassava), Solanaceae (tobacco, potato, tomato, and pepper), and Fabaceae (soybean, cowpea, common bean, and mungbean). Mastreviruses infect chickpea and pepper crops in Australia, Oman, Yemen, Jordan, Syria, and Iraq. Becurtoviruses infect some crops like sugar beet and tomato in Iran. Capulaviruses have been recorded in France and Finland infecting Alfalfa and Plantago plants, respectively. The geminiviruses pose a great challenge to the countries by their fast spread and infecting economic crops. Cooperation among these countries in exchanging information and adopting the most up-to-date system in quarantine can prevent further introduction of new viruses into new geographic regions.
Chapter
The Middle East is an important agricultural region that produces a variety of important crops including fruits, vegetables, oil crops, and cereals. The family Geminiviridae has become one of the factors limiting crop production in the Middle East, including Iraq. It includes members that are causing devastating diseases that have resulted in serious losses in crop production both in quantity and quality. Geminiviruses were introduced into Iraqi agriculture decades ago, causing severe damage to both local and domesticated varieties. The activity of whiteflies (Bemisia tabaci) and leafhopper (Jacobiasca lybica) may enable several geminiviruses to spread quickly nationwide. This chapter discussed the incidence of geminiviruses infecting crops grown in Iraq, the geminiviruses reported so far, their spread nationwide, their transmission and host range, some applications applied to manage geminiviruses in Iraq, the phylogenetic relatedness to geminiviruses in the Middle Eastern neighbors, the epidemic status, and possible entry from the Middle Eastern countries to Iraq.
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To evaluate the effect of mixed infection of two main pathogens of tomato in Iran, the interaction between tomato big bud phytoplasma (TBBP, 16SrII-D) and Tomato yellow leaf curl virus (TYLCV) was investigated under greenhouse condition. Tomato plants were graft-inoculated either with TBBP or TYLCV alone or together simultaneously and non-simultaneously. Symptoms expression and incubation period of the diseases were evaluated on all inoculated plants. To assess pathogen development, the concentrations of TBBP and TYLCV were compared at 10, 20, 40 and 70 days post-inoculation using quantitative PCR assays. In all replications, the tomato plants doubly inoculated with TBBP + TYLCV showed milder symptoms and longer incubation period than those singly inoculated with TBBP or TYLCV. Results also showed a reduction of TYLCV and TBBP concentrations in doubly inoculated plants when compared to single infection, although these reductions were not always statistically significant. In the tomato plants simultaneously inoculated with TBBP and TYLCV, the phytoplasma and virus concentrations were significantly lower at 70 days post-inoculation. These results suggest an antagonism between TYLCV and TBBP when infecting the tomato plant.
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Begomoviruses are an emerging group of plant viruses, exclusively transmitted by the whitefly Bemisia tabaci in a persistent-circulative manner. Despite the economic importance of both, very little is known about begomovirus-whitefly interactions. Specific topics of interest that have been a subject of intensive research during the last decade include the route of the virus in the insect organs and cells, the influence of the virus on the insect's behavior and transcriptome, the proteins that mediate begomovirus translocation and the role of bacterial symbionts in this phenomenon. These topics are summarized and discussed in this chapter.
Conference Paper
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The sweet potato whitefly, Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae), is one of the most economically important pests of agricultural and horticultural crops in Iran. Economic losses from this pest may be through direct damage to the plant due to excretion of honey dew and indirect loss through transmitting plant viruses. In this study leaves infested with whitefly nymphs and pupae were collected in different provinces of Iran and transferred to the laboratory for identification of B. tabaci biotypes. After identification of whitefly species as B. tabaci based on their morphological characteristics, some samples were dried and sent to Australia and some were stored in 70% ethanol for DNA extraction and RAPD-PCR analysis. All samples sent to Australia were identified as B biotype based on ITS1 region of ribosomal DNA. However, based on genomic DNA PAPD-PCR band patterns using H16 primer, in addition to B biotype, other biotypes including Cv biotype were also detected. The results suggest that B biotype of B. tabaci forms the dominant population of B. tabaci in Iran. Since different biotypes require different managements, more research is needed to identify the role of each biotype on direct damage of the insect to the host plants and on geminiviruses transmission.
Article
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The concept of "Top Ten" lists of plant pathogens is in vogue in recent years, and plant viruses are no exception. However, the only list available has more to do with historical and scientific worth than it has to do with economic impact on humans and their animals. This review will discuss the most important plant viruses that cause serious harm to food plants that sustain the bulk of humankind.
Article
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The family Geminiviridae includes plant-infecting circular single-stranded DNA viruses that have geminate particle morphology. Members of this family infect both monocotyledonous and dicotyledonous plants and have a nearly global distribution. With the advent of new molecular tools and low-cost sequencing, there has been a significant increase in the discovery of new geminiviruses in various cultivated and non-cultivated plants. In this communication, we highlight the establishment of three new genera (Becurtovirus, Eragrovirus and Turncurtovirus) to accommodate various recently discovered geminiviruses that are highly divergent and, in some cases, have unique genome architectures. The genus Becurtovirus has two viral species, Beet curly top Iran virus (28 isolates; leafhopper vector Circulifer haematoceps) and Spinach curly top Arizona virus (1 isolate; unknown vector), whereas the genera Eragrovirus and Turncurtovirus each have a single assigned species: Eragrostis curvula streak virus (6 isolates; unknown vector) and Turnip curly top virus (20 isolates; leafhopper vector Circulifer haematoceps), respectively. Based on analysis of all of the genome sequences available in public databases for each of the three new genera, we provide guidelines and protocols for species and strain classification within these three new genera.
Article
The occurrence of Tomato yellow leaf curl virus (TYLCV; genus Begomovirus, family Geminiviridae) in the major tomato-growing areas of Iran was determined using TAS-ELISA and PCR. The nucleotide sequences of the coat protein (CP) gene and intergenic region (IR) of eight Iranian isolates were determined. CP nucleotide identities among the Iranian isolates were 96–98%, and showed 94–96% identity with TYLCV-IR [IR:Ira:98] and TYLCV-IL [IL:Reo:86]. However, they showed low identity (68–69%) with ToLCIRV-[IR:Ira]. Sequence analyses of IR indicated that seven Iranian isolates had sequence identity of 93–100% with each other, and 76% identity with the Jiroft isolate; identities of 75–79% with TYLCV-IR[IR:Ira:98] were observed in every case, and 59–62% identity with ToLCIRV-[IR:Ira]. The IR nucleotide sequences of Iranian isolates showed 92–93% identity with TYLCV-IL[IL:Reo:86], except the Jiroft isolate (75%). The CP and IR sequence analyses suggested that eight Iranian TYLCV isolates probably differ from ToLCIRV-[IR:Ira]. Based on IR sequence comparisons and phylogenetic analyses, the Iranian isolates were divided into two groups. The first major group (A), consists of seven virus isolates, was most closely related to TYLCV-IL[IL:Reo:86], and relatively divergent from TYLCV-IR [IR:Ira:98] and ToLCIRV-[IR:Ira]. However, the Jiroft isolate from group B did not show high similarity with TYLCV-IR[IR:Ira:98], ToLCIRV-[IR:Ira], and TYLCV-IL[IL:Reo:86], suggesting that the isolate may be a divergent variant. The differences are in a range that suggests different strains or species from TYLCV-IR[IR:Ira:98] and ToLCIRV-[IR:Ira] are probably associated with tomato yellow leaf curl disease in Iran.
Article
The groundnut, Arachis pintoi, was grown as a ground cover with bell pepper, Capsicum annum cv. Tropical Irazui to determine its effects on reducing numbers of the sweet potato whitefly, Bemisia tabaci (Gennadius), and associated gemini virus diseases. In 1996, whitefly population levels were relatively low and no differences in the numbers of whiteflies per plant were detected during the initial two observations. Although the number of whiteflies never surpassed 2.7 per plant in 1996, at the final observation, approximately four times as many whiteflies were observed on bell pepper plants grown without ground cover than on plants with cover. Whitefly numbers were higher in 1997 and reached a maximum of 8.10 per plant in plots without A. pintoi. The greatest number of B. tabaci in the 1997 plots with the ground cover was only 0.38 per plant on the final observation date. Disease onset was earlier and frequency was greater in plants without cover. At the final sample date in 1996, 81.5% of the plants grown without cover were diseased while only 52.6% of the plants with ground cover expressed symptoms. This difference was more pronounced at the last sample date in 1997 when 39.0 and 4.5% of the plants expressed symptoms in plots without and with A. pintoi, respectively. On different dates, 50 samples were taken from plots of A. pintoi to determine the presence of whitefly on foliage of the ground cover. Only one whitefly was found on one of the samples taken. Accumulative yields at the conclusion of the 1996 study were 5.11 and 1.35 kg plant-1 for plants with ground cover and without ground cover, respectively. A similar trend was observed in 1997 when yields were 1.64 and 0.82 kg plant-1 in plots with and without A. pintoi, respectively.