Isolation and molecular analysis of SRBSDV isolates infecting rice in Vietnam
Keywords:
Fijivirus, Vietnam, Rice, Sequence analysis, EvolutionAbstract
Southern rice black-streaked dwarf virus (SRBSDV) is a newly described member of the sub-group 2 in the genus Fijivirus, family Reoviridae. SRBSDV genome has 10 segments encoding 13 opened reading frames (ORFs). In this study we cloned and sequenced 6 ORFs from SRBSDV isolates collected from 3 provinces in Vietnam. The sequence analysis suggested that SRBSDV populations in North Vietnam are closely related to those in South China. The viral isolates from Nghe-An and Quang-Tri provinces of Vietnam were closer to each other as compared to the Quang-Ngai province suggesting that the virus seems to be evolving while spreading in a southern direction. Moreover the analysis revealed the presence of DNA binding domains in gene 5.2 indicating that it may be playing an important role in the viral life cycle.
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