Shibata Yuji, Cabunagan Rogelio C, Cabauatan Pepito Q, Choi Il-Ryong
International Rice Research Institute, Plant Breeding, Genetics and Biotechnology Division, DAPO Box 7777, Metro Manila, Philippines.
Plant Dis. 2007 Nov;91(11):1386-1391. doi: 10.1094/PDIS-91-11-1386.
Rice tungro disease (RTD) is caused by the interaction between Rice tungro spherical virus (RTSV) and Rice tungro bacilliform virus (RTBV), both of which are transmitted by green leafhoppers (GLH). In order to define the resistance against RTD in rice cv. Matatag 9 which was developed by interspecific hybridization between RTD-susceptible cv. IR64 and Oryza rufipogon, the reactions of Matatag 9 to the viruses and GLH were evaluated in comparison with RTD-susceptible and -resistant rice cultivars. The incidences of infection with RTSV and RTBV in Matatag 9 were significantly lower than those in the susceptible parent cv. IR64; however, no substantial differences in virus accumulation were observed between IR64 and Matatag 9 once infected with the viruses. Symptoms in Matatag 9 infected with RTBV and RTSV were milder than those observed in IR64. A higher level of antixenosis to GLH was observed in Matatag 9 compared with IR64. The levels of antibiosis against GLH in Matatag 9 were comparable with those in another GLH-resistant cultivar, and significantly higher than those in RTD-susceptible cultivars. Collectively, these results suggest that tolerance to tungro viruses and resistance to GLH both contribute to the apparent resistance to RTD in Matatag 9, although possible involvement of other resistance mechanisms cannot be excluded.
水稻东格鲁病（RTD）由水稻东格鲁球形病毒（RTSV）和水稻东格鲁杆状病毒（RTBV）相互作用引起，这两种病毒均由绿叶蝉（GLH）传播。为了确定通过RTD易感品种IR64与野生稻种间杂交培育的水稻品种Matatag 9对RTD的抗性，将Matatag 9对病毒和绿叶蝉的反应与RTD易感和抗性水稻品种进行了比较评估。Matatag 9中RTSV和RTBV的感染率显著低于易感亲本品种IR64；然而，一旦感染病毒，IR64和Matatag 9之间未观察到病毒积累的实质性差异。感染RTBV和RTSV的Matatag 9的症状比IR64中观察到的症状更轻。与IR64相比，Matatag 9对绿叶蝉表现出更高水平的忌避性。Matatag 9对绿叶蝉的抗生性水平与另一个抗绿叶蝉品种相当，且显著高于RTD易感品种。总体而言,这些结果表明，对东格鲁病毒的耐受性和对绿叶蝉的抗性均有助于Matatag 9对RTD的明显抗性，尽管不能排除其他抗性机制可能的参与。
