Construction of rice stripe virus NS2 and NS3 Co-RNAi transgenic rice and disease-resistance analysis / 病毒学报

NS2 and NS3 are two post-transcriptional gene silencing suppressors that are encoded by Rice stripe virus. Gene silencing suppressors are always related to the pathogenicity of viruses. In this study, the cDNA of NS2 and NS3 were recombined by overlapping PCR assays, ligated to the RNAi vector, and inserted into the PXQ expression vector using Pst I; the expressed vector was transferred into calluses induced from seeds of the japonica rice cultivar, 'Nipponbare', using an Agrobacterium-mediated method. Thirty-one T0 transgenic plants were selected by G418 screening. PCR and southern blot analyses confirmed that the target gene was transformed into transgenic rice successfully, and different transgenic plants contained various copies of the gene. The disease resistance assay revealed that T0 transgenic rice had a delayed onset of RSV for approximately 10-20 d, and the accumulation of virus in the transgenic plants was reduced by 30%-50%. This was related to the delayed onset of disease.

Rapid detection of molecular variation of Rice stripe virus in China by PCR-SSCP assay / 中国病毒学

A reverse transcription polymerase chain reaction (RT-PCR) and single-strand conformation polymorphisms (SSCP) assay were applied to rapidly detect the molecular variability in CP and SP genes among seven isolates of Rice stripe virus in China. The PCR results showed that the CP gene of JD isolate and SP gene of PJ isolate could not be amplified. SSCP analysis showed that there were completely different electrophoretic pattern of CP gene among six isolates. To SP gene, SSCP results also discovered polymorphisms. There were five patterns among these isolates, and the pattern of YL and BS isolates were same.