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RISS 인기검색어
- 검색키워드
- 저자 : Mahmoud H. El_Komy (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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El_Komy, Mahmoud H.,Saleh, Amgad A.,Eranthodi, Anas,Molan, Younes Y. The Korean Society of Plant Pathology 2015 Plant Pathology Journal Vol.31 No.1
The use of novel isolates of Trichoderma with efficient antagonistic capacity against Fusarium oxysporum f. sp. lycopersici (FOL) is a promising alternative strategy to pesticides for tomato wilt management. We evaluated the antagonistic activity of 30 isolates of T. asperellum against 4 different isolates of FOL. The production of extracellular cell wall degrading enzymes of the antagonistic isolates was also measured. The random amplified polymorphic DNA (RAPD) method was applied to assess the genetic variability among the T. asperellum isolates. All of the T. asperellum isolates significantly reduced the mycelial growth of FOL isolates but the amount of growth reduction varied significantly as well. There was a correlation between the antagonistic capacity of T. asperellum isolates towards FOL and their lytic enzyme production. Isolates showing high levels of chitinase and ${\beta}$-1,3-glucanase activities strongly inhibited the growth of FOL isolates. RAPD analysis showed a high level of genetic variation among T. asperellum isolates. The UPGMA dendrogram revealed that T. asperellum isolates could not be grouped by their antagonistic behavior or lytic enzymes production. Six isolates of T. asperellum were highly antagonistic towards FOL and potentially could be used in commercial agriculture to control tomato wilt. Our results are consistent with the conclusion that understanding the genetic variation within Trichoderma isolates and their biochemical capabilities are required for the selection of effective indigenous fungal strains for the use as biocontrol agents.
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El-Komy, Mahmoud H. The Korean Society of Plant Pathology 2014 Plant Pathology Journal Vol.30 No.4
In this study, resistance responses were investigated during the interaction of Botrytis fabae with two faba bean cultivars expressing different levels of resistance against this pathogen, Nubaria (resistant) and Giza 40 (susceptible). Disease severity was assessed on leaves using a rating scale from 1 to 9. Accumulation levels of reactive oxygen species (ROS), lipid peroxidation and antioxidant enzymes (superoxide dismutase, catalase and ascorbate peroxidase) were measured in leaf tissues at different times of infection. The expression profiles of two pathogenesis-related proteins (PRPs) encoded by the genes PR-1 and ${\beta}$-1,3-glucanase were also investigated using reverse transcription RT-PCR analysis. The accumulation of these defense responses was induced significantly in both cultivars upon infection with B. fabae compared with un-inoculated controls. The resistant cultivar showed weaker necrotic symptom expression, less ROS accumulation, a lower rate of lipid peroxidation and higher activity of the enzymatic ROS scavenging system compared with susceptible cultivar. Interestingly, ROS accumulated rapidly in the resistant leaf tissues and peaked during the early stages of infection, whereas accumulation was stronger and more intense in the susceptible tissues in later stages. Moreover, the response of the resistant cultivar to infection was earlier and stronger, exhibiting high transcript accumulation of the PR genes. These results indicated that the induction of oxidant/antioxidant responses and the accumulation of PRPs are part of the faba bean defense mechanism against the necrotrophic fungus B. fabae with a different intensity and timing of induction, depending on the resistance levels.
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Mahmoud H. El-Komy 한국식물병리학회 2014 Plant Pathology Journal Vol.30 No.4
In this study, resistance responses were investigatedduring the interaction of Botrytis fabae with two fababean cultivars expressing different levels of resistanceagainst this pathogen, Nubaria (resistant) and Giza 40(susceptible). Disease severity was assessed on leavesusing a rating scale from 1 to 9. Accumulation levels ofreactive oxygen species (ROS), lipid peroxidation andantioxidant enzymes (superoxide dismutase, catalaseand ascorbate peroxidase) were measured in leaf tissuesat different times of infection. The expression profilesof two pathogenesis-related proteins (PRPs) encodedby the genes PR-1 and β-1,3-glucanase were also investigatedusing reverse transcription RT-PCR analysis. The accumulation of these defense responses was inducedsignificantly in both cultivars upon infection withB. fabae compared with un-inoculated controls. Theresistant cultivar showed weaker necrotic symptomexpression, less ROS accumulation, a lower rate of lipidperoxidation and higher activity of the enzymatic ROSscavenging system compared with susceptible cultivar. Interestingly, ROS accumulated rapidly in the resistantleaf tissues and peaked during the early stages of infection,whereas accumulation was stronger and moreintense in the susceptible tissues in later stages. Moreover,the response of the resistant cultivar to infectionwas earlier and stronger, exhibiting high transcriptaccumulation of the PR genes. These results indicatedthat the induction of oxidant/antioxidant responses andthe accumulation of PRPs are part of the faba beandefense mechanism against the necrotrophic fungus B. fabae with a different intensity and timing of induction,depending on the resistance levels.
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Mahmoud H. El_Komy,Amgad A. Saleh,Anas Eranthodi,Younes Y. Molan 한국식물병리학회 2015 Plant Pathology Journal Vol.31 No.1
The use of novel isolates of Trichoderma with efficient antagonistic capacity against Fusarium oxysporum f. sp. lycopersici (FOL) is a promising alternative strategy to pesticides for tomato wilt management. We evaluated the antagonistic activity of 30 isolates of T. asperellum against 4 different isolates of FOL. The production of extracellular cell wall degrading enzymes of the antagonistic isolates was also measured. The random amplified polymorphic DNA (RAPD) method was applied to assess the genetic variability among the T. asperellum isolates. All of the T. asperellum isolates significantly reduced the mycelial growth of FOL isolates but the amount of growth reduction varied significantly as well. There was a correlation between the antagonistic capacity of T. asperellum isolates towards FOL and their lytic enzyme production. Isolates showing high levels of chitinase and β-1,3-glucanase activities strongly inhibited the growth of FOL isolates. RAPD analysis showed a high level of genetic variation among T. asperellum isolates. The UPGMA dendrogram revealed that T. asperellum isolates could not be grouped by their antagonistic behavior or lytic enzymes production. Six isolates of T. asperellum were highly antagonistic towards FOL and potentially could be used in commercial agriculture to control tomato wilt. Our results are consistent with the conclusion that understanding the genetic variation within Trichoderma isolates and their biochemical capabilities are required for the selection of effective indigenous fungal strains for the use as biocontrol agents.
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