Abstract
Genetic diagnosis method of Virion Captured (VC)/RT-PCR for Rice stripe virus (RSV) and Rice black-streaked dwarf virus (RBSDV), Korean major rice viruses transmitted by small brown plant hopper, Laodelphax striatellus, was developed. Virion extraction buffer for rice plant was 0.01M potassium phosphate buffer, pH 7.0, containing 0.5% sodium sulfite. However, the extraction buffer for L. striatellus was 0.01M potassium phosphate buffer, pH 7.0, containing 0.5% sodium sulfite and 2% polyvinylpyrrolidone wt 40,000 (PVP-40). Specific primers for detection of RSV and RBSDV were selected for VC/RT-PCR method. The specific primers were used as a duplex primer to detect viruliferous small brown plant hopper collected from Gimpo, Pyeongtaek and Siheung areas in Gyeonggi province. The genetic diagnosis methods of single and duplex VC/RT-PCR for RSV and RBSDV could be used easily and economically, especially on the diagnosis of L. striatellus. The rate of viruliferous insect (RVI) for RSV was compared with ELISA and VC/RT-PCR for L. striatellus collected from fields. RVI by ELISA was same as 9.2% with RVI by VC/RT-PCR. However, there were some different detection results between the methods. It could be suggested that there is a possibility of serological and/or genomic differences among RSV isolates. The portion of RVI detected simultaneously by ELISA and VC/RT-PCR was 71.0%, and the detection rate from VC/RT-PCR was higher as 3.2% than that from ELISA, which had a reason of simultaneous detection ability both RSV and RBSDV of VC/RT-PCR.
우리나라 벼에 발생하는 주요 바이러스 중 애멸구에 의하여 전염하는 벼줄무의잎마름병(RSV)과 벼검은줄오갈병(RBSDV)에 대한 간편한 유전자 진단법인 VCHT-PCR 방법을 개발하였다. 벼 잎의 경우 즙액 추출 완충액은 0.5% sodium sulfite를 첨가한 0.01 M 인산완충액(pH 7.0)을 기본 완충액으로 이용하고 애멸구를 진단할 경우에는 기본 완충액에 2% PVP을 첨가하였을 때 VC/RT-PCR 진단이 잘 되었다. VC/RT-PCR을 이용한 진단에 적합한 RSV와 RBSDV 프라이머를 선발하였고 이것을 이용하여 동시진단으로 경기도 김포, 평택, 시흥지역에서 채집한 애멸구의 RSV와 RBSDV의 보독충을 쉽고 경제적으로 진단 할 수 있었다. ELISA에 의한 진단결과와 비교할 때 세 지역을 합하여 RSV에 대한 평균 보독충률은 9.2%로 동일하였으나 보독충 중 일부가 ELISA와 VC/RT-PCR 두 방법에 의한 진단결과가 다르게 나온 것은 RSV의 혈청학적, 유전적 계통 존재 가능성을 제시하고 있다. 포장에서 채집한 애멸구의 VC/RT-PCR 진단효율은 RSV와 RBSDV를 동시에 진단하므로 써 RSV만 진단이 가능한 ELISA 결과 보다 3.2% 높았다.
