Pathogenicity evaluation of the pathogenic fungi causing oak tree dieback in Kermanshah province

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Saber Nasab Mohammad; JAMALI SAMAD; Maaref Alireza; ABBASI SAEED

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Journal: Iranian Journal of Plant Protection Science Year:2020 | Volume:51 | Issue:1 Page(s): 79-92

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Title

Pathogenicity evaluation of the pathogenic fungi causing oak tree dieback in Kermanshah province

Author(s)

Saber Nasab Mohammad | JAMALI SAMAD | Maaref Alireza | ABBASI SAEED | Issue Writer Certificate

Keywords

Biscogniauxia mediterraneaQ1

molecular identificationQ1

oakQ1

IranQ2

Abstract

oak dieback is one of the most important diseases that presently affects the Zagros oak forests (Northwest to Southeast of Iran). The presence of Paecilomyces formosus, Biscogniauxia mediterranea, and Neoscytalidium novaehollandiae associated with oak trees that show dieback and declining symptoms in the forests of Kermanshah province and the molecular and pathogenic characteristics of these pathogenic isolates were investigated. In the molecular analysis using blast search tools, all three pathogens showed homology of 100% with the species mentioned in the GenBank. Pathogenicity tests revealed that all isolates of these three pathogens were capable of producing cankers on detached branches and inoculated seedlings of oak trees. Our results showed that all three species obtained from oak trees could produce cankers on excised branches of other trees. In comparison with pathogenicity on two-year-old seedlings under drought stress, there was a significant difference between the three species in terms of the rate of disease progression, so that B. mediterranea caused symptoms on seedlings inoculated under drought stress in a shorter time. Paecilomyces formosus caused symptoms in a longer period on the inoculated seedlings than the other two species. After inoculation, all cankers that extended upward and downward from the point of inoculation were evident on stems of all inoculated seedlings. Re-isolation was performed, and isolates were compared to original cultures providing evidence for fulfilling Koch’ s postulates. Investigation of the effect of temperature on the radial growth of pathogenic species showed that all three species are thermophilic fungi, which may be related to warming and drought.

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APA: Copy

Saber Nasab, Mohammad, JAMALI, SAMAD, Maaref, Alireza, & ABBASI, SAEED. (2020). Pathogenicity evaluation of the pathogenic fungi causing oak tree dieback in Kermanshah province. IRANIAN JOURNAL OF PLANT PROTECTION SCIENCE (IRANIAN JOURNAL OF AGRICULTURAL SCIENCES), 51(1 ), 79-92. SID. https://sid.ir/paper/370425/en

Vancouver: Copy

Saber Nasab Mohammad, JAMALI SAMAD, Maaref Alireza, ABBASI SAEED. Pathogenicity evaluation of the pathogenic fungi causing oak tree dieback in Kermanshah province. IRANIAN JOURNAL OF PLANT PROTECTION SCIENCE (IRANIAN JOURNAL OF AGRICULTURAL SCIENCES)[Internet]. 2020;51(1 ):79-92. Available from: https://sid.ir/paper/370425/en

IEEE: Copy

Mohammad Saber Nasab, SAMAD JAMALI, Alireza Maaref, and SAEED ABBASI, “Pathogenicity evaluation of the pathogenic fungi causing oak tree dieback in Kermanshah province,” IRANIAN JOURNAL OF PLANT PROTECTION SCIENCE (IRANIAN JOURNAL OF AGRICULTURAL SCIENCES), vol. 51, no. 1 , pp. 79–92, 2020, [Online]. Available: https://sid.ir/paper/370425/en

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