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Introduction
Pejman Khodaygan currently works at the Department of Plant Protection, Vali-e-Asr University Of Rafsanjan. Pejman Khodaygan is the Head of Research and Development at Rishah Gostar Vira Company, a firm dedicated to producing plant probiotics, biofertilizers, and biocontrol agents. "Our primary project is dedicated to exploring the various dimensions of Rhizobium bacteria as a highly beneficial and versatile species."
Current institution
Publications
Publications (64)
Stalk and bulb decay of garlic (Allium sativum L.) was observed in commercial fields in Jiroft County, Kerman Province, Iran. The causal agent was isolated from symptomatic plants and identified as Rahnella perminowiae based on its morphological and biochemical characteristics and confirmed by specific primers and sequence analysis of 16S rRNA, gyr...
In May 2016, leaf spot symptoms were observed on five-year-old common fig trees, located in Sari county (Mazandaran province). Symptoms comprised irregular and brown necrotic spots, surrounded by yellow halos. Yellow-colored, mucoid bacterial colonies were consistently isolated from the infected samples. Bacterial isolates were identified by using...
Alnus subcordata, also known as the Caucasian alder, is a highly beneficial species for afforestation due to its rapid growth, nitrogen-fixing ability, and positive impact on soil fertility. This tree may change the soil microbial community and play a vital role in nutrient cycling. In Iran, Caucasian alder is one of the most valuable commercial sp...
Elaeagnus angustifolia L., also known as Russian live or Oleaster, is a species with multiple traits of economic, ornamental, and high ecological value. It is native to central and eastern Asia, southern Europe and can also be found in Canada and the western part of the United States. During the summer of 2020, naturally occurring nodules on the ro...
Camel thorn (Alhagi persarum L., Fabaceae) is an important perennial weed that can be found in nearly all regions of Iran. It is used as herbal medicine and more recently cultivated as animal fodder. Rhizobia are essential for sustainable agriculture due to their ability to fix atmospheric nitrogen and enhance plant growth. Their complex genetic ma...
In 2016, potato tuber soft rot symptoms were observed in major potato production fields in Jiroft county (southern Kerman province, Iran). Bacteria, which appeared as white to creamy colonies, were isolated from diseased tissues and shown to be pathogenic on potato tubers after inoculation and re-isolation of the isolates. Based on the assessment o...
Grapevine (Vitis vinifera L.) is one of the most economically important and widely cultivated fruit crops worldwide. In the summers of 2018 and 2019, a new disease of grapevine was observed in vineyards of Bojnurd (North Khorasan province) and Gorgan (Golestan province) in Iran. The affected grapevines displayed cankerous lesions on the stems, sunk...
The cultivation of Persian walnuts in Iran is concentrated in the mountainous regions of Zagros and Alborz, encompassing Kohgiluyeh and Boyer‐Ahmad, Isfahan and Fars provinces. Historically, these areas were renowned for their abundant growth of oak trees. However, due to environmental stressors, oak populations in the Zagros region have been decli...
Biocontrol agents are safe and effective methods for controlling plant disease pathogens, such as Fusarium solani, which causes dry wilt, and Pectobacterium spp., responsible for potato soft rot disease. Discovering agents that can effectively control both fungal and bacterial pathogens in potatoes has always presented a challenge. Biological contr...
The cultivation of Persian walnut (Juglans regia) in Iran is concentrated in the mountainous regions of Zagros and Alborz, encompassing the provinces of Mazandaran, Golestan, Semnan, Kurdistan, Hamedan, Lorestan, Isfahan, Kohgiluyeh and Boyer-Ahmad, Fars and Kerman. Due to the widespread distribution of walnut across Iran, these areas are prone to...
Die-back of pistachio (DBP) is a major disease affecting pistachio trees in Iran and has become a serious problem in Kerman province in recent years. In the current study, the role of bacteria as causal agents of DBP was investigated under laboratory and field conditions. Samples were collected from infected pistachio orchards in Kerman province fr...
Eucalypts are cultivated in many regions of the world because of their amenability to intensive plantation forestry (environmental adaptability and plasticity of clones, fast growth, easiness of rooting and strong re-sprouting after coppicing), quality of the timber for multiple uses and high economic performance. Symptomatic Eucalyptus camaldulens...
Among predatory bacteria, Bdellovibrio and Like Organisms (BALOs) have a high potential for application as biocontrol agents. The objective of this study was to isolate and characterize native BALO strains from different water and soil samples in Iran. Nineteen BALO strains were obtained from the samples using Escherichia coli as prey. Analysis of...
Hazelnut (Corylus avellanae), a plant native to the temperate northern hemisphere, is cultivated in Iran mainly in the northern parts of the country. Irregular reddish-brown necrotic spots surrounded by a yellow halo on hazelnut leaves and fruit bracts, leading to wilting of leaves, defoliation, and branch dieback, were observed during 2018 and 201...
Fire blight, caused by Erwinia amylovora bacteria, is one of the well-known plant diseases in the world including major diseases of the fruit trees, especially apples and pears. In recent years, due to chemical nature of the pesticides damaging human health and environment, the importance of biological control is considered as alternative measure t...
Biofilm formation and rhizosphere colonization of the plants are the main infrastructures for the biological control of the plant diseases. Bacteria accumulation in the protective layer, which results from their self-production of Exopolysaccharides (EPS), is called the biofilm. The formation of these complex structures originates from the multicel...
Alginate is a common agent used for microencapsulation; however, the formed capsule is easily damaged. Therefore, alginate requires blending with other biopolymers to reduce capsule vulnerability. Whey protein is one polymer that can be incorporated with alginate to improve microcapsule structure. In this study, three different encapsulation method...
Crown and stem gall caused by agrobacterial species is one of the most devastating diseases on different crops worldwide. In spring 2018, an alert concerning a disease forming galls on seedlings of pistachio in nurseries was received from Rafsanjan county, Kerman province, Iran. After isolation of bacteria from the galls by using conventional bacte...
Preserving the efficacy of plant probiotic bacteria in soil is a major challenge to the biological control of plant diseases. The microencapsulation technique is an important step in preserving the viability and activity of probiotics in adverse environmental conditions. The main objective of this study was to choose an appropriate coating for prob...
In 2016, bacterial canker symptoms, often with dried ooze, were observed on Salix alba plants in municipal lands and parks in Kerman and Fars provinces, Iran. To determine the causative agent, samples were collected from symptomatic trees, and macerates of the affected bark tissues were plated on sucrose nutrient agar (SNA). Ten isolates were ident...
Russian olive (Elaeagnus angustifolia) is an economically important ornamental and crop plant. It has a wide range of biologically active compounds and is regarded as a unique medicinal plant with multiple applications. Members of the order Enterobacteriales isolated from trees are often associated with bacterial canker. During the growing season f...
The Gram-negative bacterium Xanthomonas translucens infects a wide range of gramineous plants with a notable impact on small grain cereals. However, genomics-informed intra-species population structure and virulence repertories of the pathogen have rarely been investigated. In this study, the complete genome sequences of seven X. translucens strain...
Common fig (Ficus carica) is an important food crop worldwide. A canker disease was observed on common fig trees in the Kerman province, Iran during 2016-2019. Symptoms included weak trees, brown to black lesions and canker formation on the trunks accompanied by exudation of black sap. A putative pathogen was isolated from infected tissues and char...
The Morus plants with a wide range of features and properties are widely used for their edible fruits, medicinal and other ornamental purposes worldwide. In summer and spring of 2016, a wetwood disease was observed on Morus trees (Black mulberry, White mulberry and Red mulberry), in municipal lands and parks of Rafsanjan city (Kerman Province), Ira...
Cabbage with excellent source of vitamins, antioxidants and minerals, is among the most popular vegetables worldwide. In 2016, during our surveys of cabbage diseases in the Mazandaran province, Iran, symptoms of blight and detaching of leaves, water soaking, browning and decline were observed on the mature plants of cabbage (Brassica oleracea var....
Gummosis (Phytophthora root and crown rot) is an important and destructive disease that affects fruit trees like pistachio (Pistacia vera L.). Although many studies have been performed on the possibility of biological control of gummosis, up to now few studies have been done on transcriptionally induced resistance genes in pistachio against Phytoph...
Lawson cypress (Chamaecyparis lawsoniana), an important landscape tree, is widely planted in gardens and parks throughout Iran. Crown gall disease on Lawson cypress trees was observed in Sari and Juybar Counties, Mazandaran province, northern Iran in 2017. Isolation from galls on potato dextrose agar (PDA) containing CaCO3 yielded bacterial colonie...
Aspergillus flavus:
is the main aflatoxin producer in food and feed and has wide ecological niches. Contamination of food products such as pistachio nuts and aflatoxin secretion directly affects food safety and international food product trades. Abilities of 13 yeast strains isolated from 200 soil and pistachio nut samples collected in Iranian orc...
During the surveys in the major cactus-growing regions of Mazandaran Province of Iran, symptoms of soft rot were observed on the Eve's pin (Austrocylindropuntia subulate) plants. Cactus samples with typical symptoms including soft rot, black colored and water-soaked lesion at the entire of plants stem were collected and transferred to the laborator...
This study provides a phylogeographic insight into the population diversity of Xanthomonas translucens strains causing bacterial leaf streak disease of small-grain cereals in Iran. Among the 65 bacterial strains isolated from wheat, barley, and gramineous weeds in eight Iranian provinces, using multilocus sequence analyses and typing (MLSA/MLST) of...
The genus Alder with twenty species is one of the important sources of wood production in the northern hemisphere. Caucasian alder (Alnus subcordata), in addition to its high economic importance, has a unique ecological role in the natural regeneration of damaged stands in Hyrcanian forests of Northern Iran. Symptoms of canker accompanied by liquid...
Russian olive (Elaeagnus angustifolia L) as a medicinal plant, with having diverse and valuable chemical compounds has a special importance in medical industry. This tree, with distribution in different parts of the country with different climatic conditions, has shown a wide range of ecological tolerance. Russian olive widely used in the developme...
Lawson Cypress (Chamaecyparis lawsoniana), is an evergreen native tree to USA and Europe, also is an important amenity tree widely planted in gardens and parks throughout the country and forests of northern Iran. An alert concerning new disease in nurseries of Lawson cypress has received in Mazandaran Province. In this research during sampling proc...
Crown-gall disease; as one of important bacterial disease in the nurseries, causes significant economic damage. This disease is characterized by a tumor-like growth or gall on the infected plant which reduces the growth and weakens the infected plants. The causative agents of this disease are belonged to Agrobacterium species. In the Spring and sum...
Walnut is one of the important nuts with a high economic value. Shallow bark canker, caused by Brenneria nigrifluens, is one of the most dangerous diseases of the walnut trees. Early detection of the causal agent has an important role in preventing economic and irreparable losses caused by this disease. In this study, 57 bacterial strains were isol...
The date palm hopper, Ommatissus lybicus de Bergevin, is one of the most important pests of the date palm in the Middle East and North Africa. This insect uses its needle-like sucking mouthparts to feed on phloem, which is devoid of most essential amino acids and many vitamins. The absence of essential nutrient in its diet is suggested to be amelio...
Frost damage is one of the major factors threatening pistachio production in southern part of Iran. In the present study, an attempt was made to screen and characterize ice nucleation bacteria associated with frost damage among some predominant epiphytic microflora. A large number of epiphytic bacteria was isolated from different regions in Kerman...
Microorganisms isolated from soil samples using enrichment culture technique have been grown in the minimal growth media where diazinon served as a sole carbon source. The in vitro biodegradation of diazinon by four bacterial strains entitled S1, S2, S3 and S4 that isolated from soil was studied in liquid medium. The High-Performance Liquid (HPLC)...
Ice nucleation active (INA) bacteria are common epiphytic inhabitants that cause frost damage in many plants in the near-zero temperatures. Yet, no studies were found in ice nucleation bacteria associated with pistachio trees. In our earlier study some INA strains were identified and reported. These were assigned as Pseudomonas fragi, P. putida, P....
Variation in bacterial endosymbionts associated with the date palm hopper, Ommatissus lybicus populations – CORRIGENDUM - S. Karimi, H. Izadi, M. Askari Seyahooei, A. Bagheri, P. Khodaygan
Microorganisms isolated from soil samples using an enrichment culture technique have been in the minimal media where diazinon favoured as a sole carbon source. A diazinon biodegradation study was performed in liquid medium with four bacterial strains labeled S 1 ,S 2 ,S 3 and S 4 that were isolated from lately agricultural soil. All these isolates...
The date palm hopper, Ommatissus lybicus , is a key pest of the date palm, which is expected to be comprised of many allopatric populations. The current study was carried out to determine bacterial endosymbiont diversity in the different populations of this pest. Ten date palm hopper populations were collected from the main date palm growing region...
This study focuses on the potential of Pectobacterium carotovorum subsp. carotovorum (Pcc) strains producing bacteriocin as a tool to control potato soft rot disease. Thirty out of 48 purified bacterial strains were characterized as Pcc using specific PCR and phenotypic tests. The pathogenicity and pectate degrading assays were recorded positive fo...
In Summer and Autumn of 2010, blighted cucurbits suspected of bacterial infection were observed in the East Azarbayejan province of Iran. Infected plants exhibited spots on the leaves which, in the early stages of the disease, appeared as small, yellow and water-soaked with chlorotic haloes. As time went by, the spots enlarged, necrotized and coale...
Plant diseases are among the main constraints affecting the production and productivity of crops both in terms of quality and quantity. Use of chemicals continues to be the major tactic to mitigate the menace of crop diseases. However, because of the environmental concerns, health conscious attitude of human beings and other hazards associated with...
Samples of leaf, twig and fruit from ‘Mexican’ lime (Citrus aurantifolia) and grapefruit (Citrus paradisi) with symptoms of bacterial canker were collected from different provinces throughout Iran during spring and summers of 2010 and 2011. Yellow, gram-negative colonies were isolated from infected tissue samples. Results of pathogenicity assays in...
Evaluation of phytoplasmas infection was conducted in the pistachio-growing areas of Iran (Rafsanjan in Kerman province) in early autumn of 2011. A total of 30 pistachio trees collected from a pistachio orchard in Rafsanjan showing Psylla damage symptoms and 10 samples with different abnormal symptoms from miscellaneous orchards were tested for the...
Bacteria use an unique and sophisticated system for regulating diverse physiological processes in function of their population size. This regulatory procedure, called "quorum sensing" (QS), depends on the synthesis and perception between bacteria of small signal molecules such as acyl-homoserine lactones (AHLs). It is now evident that plants can li...
In summer and autumn of 2010, blighted cucurbits suspected of bacterial infection were observed in East Azarbayejan province in Iran. Infected plants exhibited necrotic spots that were confined to their leaves. At the early stages of disease, these appeared as small, yellow, water-soaked spots with chlorotic haloes. These spots enlarged and usually...
Pectobacterium carotovorum subsp. carotovorum (Pcc) is the causal agent of soft rot of potato tubers. This study was conducted to assess the genetic variation of a collection of 32 Pcc isolates from three different potato cultivars grown in the eastern parts of Iran using subspecies-specific PCR, 16S rDNA sequencing and rep-PCR analyses and compari...
VUPf5 genetic stability as a superior strain (of the 900 bacterial strains that were isolated from the rhizosphere of different regions of Iran) for the control of take-all disease of wheat was studied. The genetic stability of the strain in terms of, whether or not, the mass and reproduction of bacteria in liquid medium was determined. VUPf5 produ...
About 900 bacterial strains obtained from plants rhizosphere from different areas of Iran and biocontrol ability were widely survey in vitro and greenhouse conditions against Gaeumannomyces graminis var. tritici the causal agent of take-all disease. Finally the best strain (VUPf5 strain) in the additional tests biocontrol ability in vitro and green...
Angular leaf spots of sleepy mallow Malvaviscus penduliflorus have been observed in some areas of Mazandaran and Golestan provinces. The spots were angular, brown and necrotic. A levan positive and oxidase negative pseudomonad was isolated from the symptomatic leaves. The biochemical and physiological characteristics and profile of fatty acid methy...
The incidence of Aspergillus species on grape (Vitis vinifera) and raisin in Rafsanjan, Kerman province, was studied. Samples including grape and raisin were taken from markets. In order to isolate Aspergillus species the samples were assayed in three methods; culturing on PDA either with or without surface disinfection as well as putting on filter...
The incidence of Aspergillus species on grapes (Vitis vinifera) in West Azarbayjan province was studied. Samples were collected in July 2011 from different vineyards. Single conidial heads were used for isolation and purification. According to morphological criteria A. niger aggregate, Aspergillis flavus, A. ochraceus, Eurotium repens, A. carbonari...
Pistachio is one of the main agricultural products and non-petroleum exports of Iran. The main problem concerning export of pistachio nuts is contamination of nuts by mycotoxins. Contamination of food and feed with mycotoxins represents a high risk for human and animal health. Aspergillus species cause not only physical damage on pistachio nuts but...
During spring 2002, wild rocket (Sisymbrium irio) plants showing leaf spot symptoms were observed in Polor Tehran province. The spots were 0.5-1.5 mm in diameter, circular to irregular brown to black, and necrotic, surrounded by faint to conspicuous chlorotic halos. A levan positive pseudomonad was isolated from the symptomatic leaves on sucrose nu...
