[Identification and genetic study of major genes of resistance to Cerospora Sojina Hara in soybean].

Soybean frogeye leaf spot is one of the main diseases in Heilongjiang province. Usually, under several physical races of Cerospora Sojina Hara existed condition, the inheritance of resistance to this disease is controlled by equal-effect polygene. While high resistant parent 'Dongnong 9674 and other sensitive parents were used to make the three resistance-sensitive combinations in this paper, the resistance to Cerospora Sojina Hara had appeared the significant major gene effect. When P1, P2, F1, F2, B1, and B2 six generations were used to study and estimate the gene effects, major genes of resistance to Cerospora Sojina Hara were identified and the genetic parameters were also estimated in three combinations. The inheritance of genes resistant to this disease was fitted to the major gene and polygene mixed inheritance model or two gene loci inheritance model. The estimation of genetic parameters indicated that the additive, dominance and epistasis effects were existed and played an important role in the resistance to Cerospora Sojina Hara. It is meaningful in soybean resistance breeding to frogeye leaf spot.