抗病基因Pi-ta在粳稻骨干亲本及其衍生品种中的传递

Transmission of resistance gene Pi-ta in japonica rice backbone parent and it's derivatives

利用Pi-ta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号衍生一代出现频率为63%,衍生二代出现频率为33%,衍生三代出现频率为9%,抗病基因Pi-ta传递与合江20号衍生系谱一致。抗谱分析表明,Pi-ta抗病基因在衍生代中出现与衍生品种的抗谱呈正相关,与后代选择过程中抗病基因丢失有关,是决定不同水稻品种稻瘟病发生程度的主要原因之一。

Hejiang20 is one of the most important backbone parents in cold region. In this paper, the rice blast resistance gene Pi-ta genetic between Hejiang20 and its 25 transmission in derivatives were analyzed by using the dominant rice Pi-ta gene markers. The results showed that frequency of resistance gene Pi-ta was 63% in the first-generations of Hejiang20 derivatives, and the frequency of occurrence in the second-generation derivative varieties was 33%, and the frequency of occurrence in the third-generation of derivative varieties was 9%. Disease transfer of gene Pi-ta Hejiang20 was just like derivative map. The spectral analysis of anti-Pi-ta results indicated that it was a positive correlation for resistance gene between which in the offspring and which in the derived varieties. These results could be caused by the loss of resistance genes in the species, which also might be one of the main reasons to determine rice blast levels of different rice varieties.