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用4个具有不同毒力的小麦白粉菌生理小种，分别接种贵在21与5个抗感不同白粉菌小种的品种杂交的F1、F2和部分组合的BC1F1，群体的幼苗离体叶段，定单株编号和统计，初步鉴定出贵农21具有2对独立的显性抗病基因，其中1对只抗1和11号小种，与P38携带的抗1和11小种的基因相同；另1对还抗311和313号小种，与P38携带的另1对基因不同。
Four F1 powdery mildew strains with different virulence were inoculated with F1, F2 and some combinations of BC1F1, which were crossed with 5 cultivars with different resistance to powdery mildew, , Order line number and statistics. It was initially identified that Guinong 21 has two pairs of independent dominant resistance genes, of which only one is resistant to race 1 and 11, which is the same as that of P17-resistant race 1 and 11; The other pair was also resistant to breeds 311 and 313, which was different from the other pair of genes carried by P38.