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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。
In 1991, 4 breeds of resistant to Soybean Cyst Nematode (SCN) (No. 4) were crossed with two varieties (black bean, middle sense or medium resistant (Yingxian black bean) 12 combinations were made by hybridization, and F1 was susceptible to F2, moderately susceptible (moderately resistant) and moderately susceptible Sense separation ratio of 1:15, measured by the separation of 1: 3 ratio. F1 showed disease resistance in reciprocal combinations with resistance to mid-resistance (mid-resistance), with a ratio of F2 to mid-sensitivity of 3: 1 separated by a 1: 1 ratio. The results of these combinations were determined by x2 The determination is in line with the expected ratio. Therefore, it was determined that the resistance of the above two resistant varieties was controlled by one pair of dominant genes and two pairs of overlapping recessive genes.