2个辣椒疫病抗性资源的抗性遗传分析

Genetic Analysis of the Resistance to Phytophthora capsici in Two Phytophthora Blight Resistant Varieties of Pepper

采用经典遗传分析方法,对来源于泰国和印度的2个辣椒疫病抗性资源Bangchang和P038的疫病抗性遗传规律进行了研究.试验将2个抗性资源分别与高感疫病自交系020和L23-9配对组合,建立各自的抗感亲本、F1(正反交)、F2及BC1(回交)4个世代群体,选用分离自广东的辣椒疫霉菌菌株ZLT0566作为侵染病原菌,用苗期灌根接种法对其各世代群体植株进行抗性鉴定,F2及BC1群体的抗感植株分离比例采用2测验进行适合性检测,结果表明:Bangchang对广东辣椒疫霉菌菌株ZLT0566的抗性遗传符合1对不完全显性基因控制模式,而P038的抗性遗传符合2对相互独立的不完全显性互补基因控制模式.

The inheritances of resistance to Phytophthora capsici in two phytophthora blight resistant varieties, a pepper cultivar Bangchang from Thailand and a wild pepper P038 from India were studied by the traditional genetic analysis method. In the present study, the F1 , F2 and reciprocal cross （ BC1 ） populations were developed by two phytophthora blight resistant varieties hybridization with highly susceptible inbred line 020 and L23-9, respectively. The resistance of plants of each population was evaluated by irrigating method using a Guangdong isolate ZLT0566 of P. capsici as inoculum. The segregation ratios of the resistant to susceptible plants in F2 and BC1 populations were analyzed byX^2 test. The results showed that Bangchang carries a single incomplete dominant gene controlling the resistance to Guangdong isolate ZLT0566, and the resistance of P038 is governed by two incomplete dominant complementary genes.