NGHIÊN CỨU ĐA DẠNG DI TRUYỀN NGUỒN GEN VIRUS GÂY BỆNH VÀNG LÙN (RGSV) VÀ LÙN XOẮN LÁ (RRSV) HẠI LÚA Ở VIỆT NAM

Totally 68 and 55 partial sequences of target genes (P3, Pc3, P5 and Pc5 for RGSV; P1, P3 and P9 for RRSV) from 17 and 21 isolates of Rice grassy stunt virus and Rice ragged stunt virus, respectively, were selected and analyzed for their genetic diversities. The diversities of both RGSV and RRSV are very low though diffirent genes diverse at different levels. Phylogenic trees reconstructed from different genes on the same RNA segment of RGSV are similar in clustering structures while they are different on different RNA segments. The too low genetic diversites of all RRSV genes lead to the unwell structured of their phylogenic trees. The structures of RGSV phylogenic trees all prove that there is no link between the genetic diversity of virus isolates and their geographic origins.