籼稻穗部性状的相关遗传力分析

Correlative Heritabilities of Panicle Characters in indica Rice

以２６个籼稻品种（系）为材料，研究了水稻穗部性状的相关遗传力．结果表明，单株产量与穗长、一次枝梗数、二次枝梗数、一次枝梗总长、二次枝梗总长、主穗粒重、百粒重、着粒密度的表型相关变异中大部分是由遗传成分引起的，环境造成的相关变异很小，它们的相关遗传贡献率均大于７０％．主穗粒重、单株有效穗数。

Correlative heretabilities of panicle characters of rice were studied with 26 indica rice varieties(lines)as materials. According to the results, the phenotypic covariances between grain yield per plant and panicle length, the number of primary branches, total length of primary branches, total length of secondary branches, the number of secondary branches,main panicle weight,100 grain weight,as well as grain density, were mostly resulted from genetic components , all of their rates of correlative heritable contributions were over 70%. The direct contributions of main panicle weight, panicle number per plant, and grain density to grain yield per plant were relatively higher.