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将Browder和Wolfe分别提出的两种毒力频率法的原理结合起来研究1991年河北省小麦叶锈菌群体毒性基因及其组合的频率,以反映其相应的抗性基因及其组合的可用性。结果表明:V_(2d),V_a 等10个毒性基因的相对频率在56.58%以上,是优势毒性基因;V_(2c),V_(24)等5个毒性基因的相对频率在7.92%以下,属稀少基因,V_1,V_(2a)等14个毒性基因的相对频率为12.07%～44.75%,介于以上二者之间。在7个与目前生产有密切关系的优势毒性基因中,以V_(3B?,10,17,23,26),V_(3B?,10,14ab,17,23,26),和V_(1,?Bg,10,14ab,17,23,26)为优势组合,达14.04%以上。在不同毒性基因组合中,出现频率较高的有V_(3B?,26),V_(?B?,10,26),V_(3Bg,10,23,36),V_(3Bg,10,17,23,26),和V_(?B?,10,14ab,17,23,26),其频率分别为89.47%,71.93%,61.40%,55.26%和34.21%,说明其相应的抗性基因组合的联合抗病性差,不宜在生产上同时利用。
The principles of two virulence frequency methods proposed by Browder and Wolfe respectively were combined to study the frequency of virulence genes and combinations of wheat leaf rust in Hebei Province in 1991 to reflect the availability of their corresponding resistance genes and combinations. The results showed that the relative frequency of 10 virulence genes such as V_ (2d) and V_a was above 56.58%, and the relative frequency of 5 virulence genes such as V_ (2c) and V_ (24) was below 7.92% The relative frequency of 14 virulence genes such as sparse genes, V_1 and V_ (2a) ranged from 12.07% to 44.75%, which ranged from above to above. Among the 7 dominant toxic genes closely related to the current production, V_ (3B ?, 10,17,23,26), V_ (3B ?, 10,14ab, 17,23,26) and V_ (1 ,? Bg, 10,14ab, 17,23,26) for the dominant combination, up to 14.04%. Among the different combinations of virulence genes, the most frequent occurrences were V_ (3B_26), V_ (B_10,46), V_ (3Bg_10,23,36), V_ (3Bg, 10,17 , 23,26), and V _ (~ B ?, 10,14ab, 17,23,26) with frequencies of 89.47%, 71.93%, 61.40%, 55.26% and 34.21%, respectively, indicating that their corresponding resistance genes Combination of joint disease resistance is poor, should not be used in the production at the same time.