【摘要】 １９９１年以抗大豆孢囊线虫（ＳＣＮ）４号生理小种的兴县灰布支黑豆、中感或中抗（应县小黑豆）、感和高感４个品种为亲本，采用完全双列杂交配制１２个组合，在抗、中感（中抗）×感和高感５个正交和４个反交组合中，Ｆ１全部感病，Ｆ２抗、中感（中抗）和感与高感分离为１：１５的比率，测交分离为１：３比率。在抗×中感（中抗）的正反交组合中，Ｆ１表现抗病，Ｆ２抗和中感（中抗）分离３：１比率，测交为１：１比率，这些组合的结果经ｘ２测定均符合予期比率。因此，确定上述两个抗源品种的抗性受１对显性基因和２对重叠的隐性基因控制。更多还原

【Abstract】 soybean crosses was made by using diallel cross with varieties which was different on resistance, medium resistance or medium susceptibility,susceptibility and high susceptibility to soybean cyst nematode(SCN).F1 of the 5 resistant and medium resistant×suseeptible,and highly susceptible crosses and their 4 reciprocal crosses were all susceptible.In F2 the segregation ratio was 1: 15 between medium susceptible (medium resistant)and susceptible (highle susceptible).The segregation ratio of test cross was 1: 3 .In the reciprocal crosses with resistance and medium sensitivity (medium resistance). F1 progeny was resistance.The segregation of resistance to medium sensitivity in F2 was 3: 1 and the segregation ratio in testcross progeny was 1:1 ,These results were not significantly different from expected ratio through x2 test.We suggested that a pair of dominant genes and two pairs of overlapping genes controlled SCN resistance in resistant varieties, such as Xingxian Huibuzhiheidou and Yingxina Xiaoheidou.更多还原