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首页> 美国政府科技报告 >The Effect of Postinoculation Temperature on Seedling Reaction of Selected Wheat Varieties to Stem Rust
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The Effect of Postinoculation Temperature on Seedling Reaction of Selected Wheat Varieties to Stem Rust

机译：接种温度对小麦品种对锈病幼苗反应的影响

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The rust reactions of seedlings of 87 varieties of wheat to Puccinia graminis var. tritici races 17, 38, and 56 were determined at greenhouse temperatures of 70 and 85F. With respect to a given race, the varieties were: (1) resistant at both temperatures, (2) susceptible at both temperatures, or (3) resistant at 70 but susceptible at 85F. Certain varieties that became susceptible at high temperature (temperature-sensitive varieties) were further tested at 70, 77, and 85F. Twenty varieties inoculated with race 17, 12 inoculated with race 38, and 15 inoculated with race 56 were resistant at 70F but susceptible at 77 and 85F. The reactions of 7 temperature-sensitive varieties to races 11, 15B, 17, 38, and 56 were observed within the critical temperature zone in which breakdown in rust resistance occurs (70-77F). Individual differences in behavior were noted among the various host-race combinations but, in general, the varieties were: (1) resistant at 70F, (2) mixed in reaction at 72-74F, and (3) susceptible at 76F. (Author)

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