大豆孢囊线虫4号生理小种抗性遗传鉴定

STUDIES ON THE INHERITANCE OF SOYBEAN RESITANCE TO RACE 4 OF SOYBEAN CYST NEMATODE

用高抗、中抗、中感和高感４个品种配制１２个完全双列杂交组合，在抗×感的５个正反交组合中，Ｆ＿１全部感病，Ｆ＿２抗、感分离比率为１：１５，测交分离比率为１：３。在高抗×中抗正反交组合中，Ｆ＿１均抗病，Ｆ＿２抗感分离比率为１：３，测交分离比率为１：１，因而确定抗源品种抗性受１对显性基因和２对重叠的隐性基因控制。

Four resistance×susceptibility crosses were made,in which the segragation ratio between resistance and susceptibility in F1 are all susceptibility,in F2 is 1:15,in test cross is 1:3; the ratio between high resistance and medium -resistance in F1are all resistance,in F2 is 1:3,in test cross is 1:1,This indicated that soybean resistance to the race 4 of SCN were controled by one dominant gene and two duplicate recessive genes.