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本试验首次在小麦成株期把我国致病力较弱的优势小种21C3和致病力较强的低频或稀有小种34C2、34C4及116的新鲜夏孢子等量混合后,在长江流域选出的8个感病品种上继代转接。试验结果表明:温室转接5代与田间重复侵染3代后,小种21C3出现频率显著上升,小种34C2频率明显下降,小种34C4和116则下降更快,甚至完全消失。小种21C3与34C2、34C4和116相比或小种34C2与34C4和116相比,其出现频率都表现极显著差异。而小种34C4和116之间则差异不明显。说明小种21C3致病力虽不强,但竞争能力最强,故在自然界能维持优势;34C2竞争能力弱于21C3,但强于34C4和116,而且致病力较强,故在自然界也能维持一定数量。小种34C4和116致病力虽强,但竞争能力极弱,因此在自然界数量极少。
This experiment for the first time in the wheat adult stage of our weak pathogenicity race 21C3 and virulence of low frequency or rare races 34C2, 34C4 and 116 of fresh summer spores mixed equal, selected in the Yangtze River Basin Out of the eight susceptible varieties on the transfer from generation to generation. The results showed that the frequency of races 21C3 increased significantly, the frequency of races 34C2 decreased significantly, and races 34C4 and 116 decreased faster or even disappeared completely. Race 21C3 showed significantly different frequencies compared to 34C2, 34C4 and 116 or races 34C2 and 34C4 and 116. The races 34C4 and 116 between the difference is not obvious. Species racecity 21C3 although not strong, but the strongest competitiveness, it can maintain the advantage in nature; 34C2 competitiveness is weaker than 21C3, but stronger than the 34C4 and 116, and strong virulence, so in nature can Maintain a certain amount. Race 34C4 and 116 race pathogenicity is strong, but very weak competitiveness, so a very small number in nature.