Yassmin M Shebany

South Valley University, Luxor, Muhafazat al Uqsur, Egypt

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Publications (6)6.89 Total impact

  • M F Abou Alhamed, Y M Shebany
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    ABSTRACT: This study aims at characterisation of the impact of Chaetomium globosum on copper stress resistance of maize seedlings. Higher levels of copper treatment decreased maize dry weight and induced a marked increase in osmotic solutes, antioxidant enzyme activity and the level of lipid peroxidation. On the other hand, addition of the endophytic C. globosum alleviated the toxic effect of copper on maize growth. The combination of copper sulphate and Chaetomium increased seedling dry weight, osmotic solute content and antioxidant enzyme activity compared to copper sulphate alone, while lipid peroxidation levels were also decreased. The fungal scavenger system might be important for supporting the ability of maize seedlings to resist copper toxicity.
    Plant Biology 06/2012; · 2.32 Impact Factor
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    Acta Agronomica Hungarica 04/2012; 60(4):319–333.
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    ABSTRACT: Dried grapes (raisin) may carry a significant mycological load contaminated via cultivation, postharvest processing practices, and drying processing. The contamination of raisin with fungi can accelerate spoilage or illness, if pathogens are present. Since raisins are used as food additives in many dishes in Saudi kitchen, there are healthy concerns on the safety of raisins consumed. In this article, the mycological profile of raisins sold in different markets at Jeddah, Kingdom of Saudi Arabia, was studied. The black raisin samples showed high fungal load compared with the white samples. Aspergillus, Alternaria, Cladosporium, Epicoccum Fusarium, and Rhizopus were the most prevalent genera isolated from raisin samples. Among six Aspergillus species isolated in this study, As. carbonarius and As. niger were the most frequently isolated species. Ochratoxin A (OTA) production in raisins was investigated using a combination of chromatographical (thin layer) and molecular (random amplified polymorphic DNA and Multiplex polymerase chain reaction) techniques. The OTA was detected in 70% of the raisin samples. Also, As. carbonarius (14 out of 19 isolates) and As. niger (2 isolates out of 9) were recognized as potential producers for OTA. Also, some molecular markers for detecting the contamination of raisin samples with OTA directly without isolating the producers were tested.
    Foodborne Pathogens and Disease 07/2011; 8(11):1221-7. · 2.28 Impact Factor
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    ABSTRACT: The mycological profile of the retail wheat flour selling in different markets at Jeddah (Kingdom of Saudi Arabia) was studied. The most common genera were Aspergillus (isolated from 70% of the tested samples), Penicillium (30%), Eurotium (14%), and in a lesser extent Fusarium (20%) and Alternaria (18%). Twenty-nine strains of Aspergillus flavus were screened for their ability to produce aflatoxins (AFs). Four strains produced only aflatoxin B1 (AFB1), two strains produced AFB1 and aflatoxin B2, and one strain produced AFB1, aflatoxin G1, and aflatoxin G2. Random amplified polymorphic DNA-polymerase chain reaction technique could not differentiate between toxigenic and nontoxigenic strains of A. flavus. AF regulatory gene was detected in three flour samples and in seven A. flavus isolates.
    Foodborne Pathogens and Disease 09/2010; 7(9):1047-54. · 2.28 Impact Factor
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    ABSTRACT: Populations of the genus Fusarium in wheat fields were studied within the crop-growing season at Qena area (Upper Egypt) using two different types of media (DCPA and DRBA) at 25°C. Fourteen Fusarium species were isolated during this study, namely F. anthophilum, F. aquaeductuum, F. chlamdosporum, F. dimerum, F. merismoides, F. moniliforme, F. oxysporum, F. poae, F. proliferatum, F. sambucinum, F. scripi, F. solani, F. sporotrichioides and F. subglutinans. Fusarium merismoides, F. oxysporum and F. sambucinum were the most common Fusarium species isolated from different wheat plant parts (rhizosphere and rhizoplane) as well as from the wheat fields (soil and air). Fusarium spp. rarely appeared at the beginning of the season and increased sharply between January to March and decreased slightly or sharply at the end of the season according to the type of media and isolation source.
    Archives of Phytopathology and Plant Protection 10/2006; 39(5):365-377.
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    ABSTRACT: Potato (Solanum tuberosum) becoming a more and more important foodstuff in the world. Also, the visual quality of fresh potatoes became a dominant criterion and a significative economical issue in potato market. According the vegetative reproduction of this species, requirements for visual quality are also needed for potato tubers. As an organ for reserve and propagation, the tuber grows underground and is in contact with soil-borne microorganisms, making it potentially exposed to blemishes. Some blemishes are due to known pathogens and others whose causes are unknown are called atypical blemishes. Therefore, knowledge about the pathogens is needed to set up efficient control strategies and to help potato growers to better know the causes of these blemishes and find technical solutions for improving the potato quality. Therefore, the objective of this proposed research study is the possibility of using some modern methods of molecular diagnostics and rapid detection of the presence of fungal contaminants in potato blemishes in Al-Qasim (Saudi Arabia). Polygonal lesions was the most observed blemish type in the collected samples. One hundred and sixty isolates were collected from different types of blemishes recorded in this study. Fusarium , Penicillium, Ilyonectria, Alternaria and Rhizoctonia were the most common genera collected from different blemish types. Using ITS region sequencing all collected fungi identified the species level. All Fusarium strains colled during this study were use to detect its pathogenicity against potato tubers. The inoculated fungi were re-isolated from the diseased potato tubers to prove the Koch's postulates. This is the first comprehensive report on identity of major pathogenic fungi causing potato dry rot isolated from potato tuber blemishes in Saudi Arabia.