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应用主成分分析法研究了２１个水稻品种对稻瘟病的９个抗性组分。结果表明：第一主成分为抗稻瘟病病害基本因子，它主要由产孢量、成株叶瘟严重度、成株病斑孢子层级指数、苗期叶瘟严重度和苗期病斑孢子层级指数５个有效组分构成；第二主成分为抗穗瘟因子，主要由穗颈瘟严重率构成。两主成分的特征根之和占全部特征根的９６．２％。该两综合因子几乎能反映原来抗性组分的全部信息量。此外，研究还表明，选用苗期病斑孢子层级指数、产孢量、成株期或苗期叶瘟严重度和穗颈瘟严重率作持久抗性的病区病圃抗性组分鉴定的定量指标是可行的。
Principal component analysis was used to study the resistance of 21 rice cultivars to rice blast. The results showed that the first principal component was the basic factor of resistance to rice blast disease. It mainly consisted of sporulation amount, the severity of the leaf blight of adult plant, the spore rank index of the adult plant, the severity of the leaf blight at seedling stage and the spore level Index five effective components; the second main component of the resistance to panicle blast factor, mainly composed of severe panicle blast rate. The sum of the characteristic roots of the two principal components accounts for 96.2% of the total characteristic roots. The combination of these two factors can reflect almost all the information of the original resistance component. In addition, the study also showed that the selection of seedling stage spore level index, sporulation, adult or seedling stage severity of pandemic and panicle severe disease rate of durable resistance of the disease area nursery resistance component identification Quantitative indicators are feasible.