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在小麦条锈病抗病性的定量鉴定中,供试品种的病指本身以及相对病指(供试品种的病指/感病对照的病指)都不能反映出品种本身的抗病性,因为这些数指都受诱发强度(包括接种菌量和环境条件)影响很大,极不稳定。通过理论推导并根据多年多地试验数据,导出了一个“相对杭病性指数”的数学模型;a=L_n X/1-X-L_n Y/1-Y其中,a为相对抗病性指数,X为感病对照的病指,Y为供试品种的病指。经检验, a值较为稳定可靠,能反映出品种本身的相对抗病性。就这一模型应用的范围和条件作了讨论。
In the quantitative identification of the disease resistance of wheat stripe rust, the disease index of the tested varieties and the relative disease index (pathological index of the tested varieties / pathological index of the susceptible control) can not reflect the disease resistance of the varieties themselves These numbers are affected by the induced strength (including inoculated bacteria and environmental conditions) a great impact, very unstable. A theoretical model of relative relative pathogenicity index was deduced from the theory and based on many years of experimental data. A = L_n X / 1-X-L_n Y / 1-Y where a is the relative disease resistance index, X is the pathogeny of disease control, Y is the disease index of the tested varieties. After testing, a value is more stable and reliable, can reflect the relative disease resistance of the species itself. The scope and conditions of the application of this model are discussed.