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利用CO39近等基因系及其累加系和4个稻瘟病菌的原始菌株及其突变体,研究稻瘟病抗性鉴定中经常考虑的几个因子。结果表明,接种孢子量与植株的病级、病斑数和发病叶面积呈正相关,品种对混合菌株接种的抗病性主要取决于致病性强的菌株,弱菌株的诱导抗性有限,过量施用氮肥可使部分抗病品种感病,被克服的主效基因没有明显的残效抗性。
Several factors frequently considered in the identification of rice blast resistance were studied using CO39 near isogenic lines, their additive lines and four original strains of M. grisea and their mutants. The results showed that the amount of inoculated spores was positively correlated with the disease grade, the number of infected spots and the area of diseased leaves. The resistance of the mixed strains to inoculation was mainly determined by the pathogenicity of the strains. The induced resistance of the weak strains was limited. Application of nitrogen fertilizer can make some disease-resistant varieties susceptible to overcome the major genes have no significant residual resistance.