抗病基因Pi-ta在骨干亲本及其衍生品种的传递

Transmission of Resistance Gene Pi-ta in Rice Backbone Parent and It’s Derivatives

利用Pi-ta的显性分子标记对寒地稻区水稻骨干亲本合江20号及其衍生品种进行Pi-ta抗性基因传递分析。结果表明,抗病基因Pi-ta在亲本合江20号衍生子1代出现的频率为50%,子2代出现的频率为33.3%、子3代出现的频率为7.7%,抗病基因Pi-ta的传递与合江20号衍生系谱一致。抗谱分析表明,Pi-ta抗病基因在子代中出现与衍生品种的抗谱正相关,这可能与后代选择过种中抗病基因的丢失有关,这也可能是决定不同水稻品种的稻瘟病发生程度的主要原因之一。

Hejiang 20 is one of the most important backbone parents in cold region.In this paper,the rice blast resistance gene Pi-ta genetic transmission between Hejiang 20 and its 27 derivatives were analyzed by using the dominant rice Pi-ta gene markers.The results showed that frequency of resistance gene Pi-ta was 50% in the first generations of Hejiang 20 derivatives,and the frequency of occurrence in the second-generation derivative varieties was 33.3%,and the frequency of occurrence in the third-generation of derivative varieties was 7.7%.Disease transmission of the resistant gent Pi-ta just liked as Hejiang 20 derivative map.The spectral analysis of Pi-ta results indicated that it was a positive correlation for resistance gene between offspring and derived varieties.These results could be caused by the loss of resistance genes in the species,which was also might be one of the main reasons to determine the levels of rice blast for the different rice varieties.