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

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 by 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.