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选用５个水稻品种，按Ｇｒｉｆｆｉｎｇ方法２进行杂交设计，以其Ｆ２代为材料分析穗型构成性状的遗传特性，结果表明．水稻穗型构成性状主要是由基因的加性效应决定的；无论是某一性状的不同品种间，还是同一品种的不同性状的一般配合力相对效应值都不同，穗型构成性状的一般配合力效应值与亲本表现呈显著的正向相关；穗型构成性状的广义遗传力和狭义遗传力都很高，遗传变异系数也大，预期遗传进度很高，在一定选择压力下，通过选择穗长、一、二次枝梗数、穗粒数、穗粒重等性状，改良水稻穗粒结构是完全可能的。
Five rice cultivars were selected for hybridization according to Griffing method 2, and the genetic characteristics of panicle traits were analyzed by F2 generation materials. The traits of panicle formation in rice are mainly determined by the additive effect of genes. The relative combining ability of different traits of different traits is different, and the general combining ability of panicle traits The effect value had a significant positive correlation with the parental performance. The broad-sense heritability and narrow heritability of the trait-forming trait were high, the coefficient of genetic variation was also large, and the expected genetic progress was very high. Under certain selection pressure, , The number of primary branches and secondary branches, the number of grains per spike, and the grain weight per spike. It is quite possible to improve the grain structure of rice.