河南省小麦白粉菌毒性结构与小麦品种抗白粉病性分析

Analysis on the Virulent Genes of Erysiphe graminis fsptritici and the Resistance of Wheat Cultivars in Henan Province

１９９４～１９９６年，用毒力频率测定结合异地鉴定方法分析了河南省小麦白粉病群体结构以及小麦品种对白粉病的抗性。结果表明，河南省小麦白粉菌对所有供试小麦材料都存在相应的毒性基因，但毒性基因频率有明显差异。对ｐｍ１、ｐｍ３ｂ、ｐｍ３ｃ、ｐｍ５、ｐｍ６和ｐｍ８的毒力频率较高（７６．５％～９５．２％），而对ｐｍ２、ｐｍ２ｘ、ｐｍ４ａ、ｐｍ４ｂ和ｐｍ２＋６的频率较低（０～１６．７％）；对１０个主要推广小麦品种毒力频率均较高（９２．２％～１００％）。还对抗源材料的有效性进行了评价。

The virulent genes of Erysiphe graminis f.sp.tritici and the resistance of wheat cultivars to powdery mildew were studied by the method of virulent frequency test and field test at 5 sites in Henan Province during 1994～1996.The result showed that the virulent genes for all wheat materials tested were found in pathogen population from Henan,but the virulent frequencies were different remarkably.The virulent frequencies on pm1,pm3b,pm3c,pm5,pm6 and pm8 were high(76.5%～95.2%),but that on pm2,pm2x,pm4a,pm4b and pm2+6 were very low(0～167%),and that on 10 commercial cultivars were very high (92.2%～100%).