Phylogenetic position of Hamedan isolates of barley yellow dwarf virus using polymerase gene sequence: first report of BYDV-PAS species in Iran

Document Type : Short Article

Authors

1 Plant protection department- Faculty of agriculture- Bu-Ali sina university- Hamedan- Iran

2 Plant protection Department, Faculty of Agriculture, Bu-ali sina university, Hamedan, Iran

Abstract

Barley yellow dwarf virus (BYDV) causes a significant yield reduction and crop loss in cereal and grasses worldwide. Studies revealed that barley yellow dwarf virus is present in most regions of Iran. Wheat and barley plants showing the infection symptoms were collected from cereal fields in Hamedan Province during the springs of 2020 and 2021. Samples were tested for BYDV infection by Indirect ELISA. Positive reactions to BYDV antibody in most samples were detected. After total RNA extraction, RT-PCR was performed to amplify polymerase gene using specific BYDV-PAV primers. BYDV-PAV is the most prevalent species of BYDVs in Iran. Results confirmed BYDV infection. For molecular and phylogenetic comparison, two samples from Hamedan and Asadabad were selected and their polymerase genes were sequenced. The sequencing results revealed that Hamedan isolate had maximum homology with Kahnouj, Karaj, Yazd and Arak isolates (with 95% - 96% identity). The isolates in this group proposed as a distinct species due to their low similarity with other isolates in GenBank. Asadabad isolate had maximum homology with Estonia and America BYDV-PAS with more than 92% homology. The results of phylogenetic analysis revealed that Iranian isolates of BYDV clustered in three distinct groups which shows the presence of a high diversity in the polymerase gene of this virus. This study is the first report of BYDV-PAS species in Iran.

Keywords

Iranian Journal of Plant Pathology
Volume 58, Issue 1
March 2022
Pages 35-42

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