水稻品种条纹叶枯病抗性稳定性评价

为了明确嘉兴市不同水稻品种对条纹叶枯病的抗性稳定性,对当地主栽品种及一批新育成品种(系)秧田期、本田期条纹叶枯病发病率进行调查,并比较不同年份间一系列品种(系)条纹叶枯病发病率的高低。结果表明,在自然发病条件下,秧田期表现抗性的品种,本田期发病率也较低,如HZ586、春江051、嘉禾218和嘉禾优555秧田期和本田期发病均较轻,水稻品种在秧田期、本田期对条纹叶枯病抗性高低保持一致。同一品种不同年份间发病率有差异,但从总体趋势看,抗性强弱保持一致,其中浙粳18 2a发病均最轻,2010年和2011年发病率分别仅为0.87%、0.36%。可见,水稻品种在不同生长期、不同年份间对条纹叶枯病的抗性保持相对稳定。

Evaluation of Resistance Stability of Rice Cultivars to Rice Stripe Disease

In order to determine the resistance stability of different rice cultivars to rice stripe virus in Jiaxing,the incidence rates of a series of major and new rice cultivars(lines) in the natural disease condition were investigated and compared in seedling and growing periods,and also in different years.The results showed that the resistance level of the rice cultivars kept consistent in seedling and growing periods,in which the incidence rates of HZ 586,Chunjiang 051,Jiahe 218 and Jiaheyou 555 were lower than other cultivars in both stages.The resistance level of the same cultivars changed slightly between years,but they were consistent in the general trend.For example,Zhejing 18 showed the lowest incidence rate both in 2010(0.87%) and 2011(0.36%).Theexperimental results show that the resistance of the tested rice cultivars to rice stripe virus remain stable basically in different growing periods and different years.