水稻品种抗褐飞虱不同生物型的稳定性

采用Tai氏方法分析估测12个水稻品种抗褐飞虱不同生物型的稳定性，以期为选育抗虫稳定性好的水稻品种提供较为有效的分析和监测方法.结果表明：光照强度、苗龄、施氮量对不同水稻品种对褐飞虱不同生物型的抗性表现及抗性稳定性有明显影响.抗褐飞虱生物型Ⅱ的品种中，RHT、RP1976-18-6-4-2、Ptb33的抗性较稳定，IR56的抗性不稳定，IR36、ASD7的抗性极不稳定；感褐飞虱生物型Ⅱ的品种中，TN1的感虫性稳定，桂华占、佛山油占、IR26的感虫性较稳定，国粳4号、Mudgo的感虫性不稳定.抗褐飞虱孟加拉型的品种中，RP1976-18-6-4-2、RHT、Ptb33的抗性不稳定，IR56的抗性极不稳定；感褐飞虱孟加拉型的品种中，桂华占、佛山油占、IR26的感虫性稳定；TN1、IR36的感虫性不稳定；国粳4号、Mudgo、ASD7的感虫性极不稳定.

Resistance stability of rice varieties to different biotypes of brown planthopper.

In order to develop an effective analytical and monitoring method in b reeding rice varieties with higher resistance stability to brown planthopper (BP H), Tai’s method (1971) was employed to estimate the resistance stability of tw elve rice varieties to different biotypes of BPH. It was shown that light intens ity, seedling age, and nitrogen application rate had significant effects on the resistance performance and stability of rice varieties to different BPH biotypes . Among the varieties with resistance to BPH biotype Ⅱ, the RHT, RP1976-18-6 -4- 2, and Ptb33 showed stable, IR56 showed unstable, while IR36 and ASD7 showed the most unstable resistance; whereas among the varieties susceptible to BPH biotyp e Ⅱ, the TN1 showed stable, Guihuazhan, Foshanyouzhan and IR26 showed relativel y stable, while Guojing No.4 and Mudgo showed unstable susceptibility. For the r ice varieties resistant to BPH biotype Bangladesh, the RHT, RP1976-18-6-4-2 and Ptb33 presented unstable, and IR56 presented very unstable resistance; whereas f or the varieties susceptible to BPH biotype Bangladesh, the Guihuazhan, Foshanyo uzhan and IR26 performed stable, TN1 and IR36 performed unstable, and Guojing No .4, Mudgo and ASD7 performed the most unstable susceptibility.