摘要： 运用多元遗传分析法分析了高粱16个数量性状的相关遗传力参数。结果表明，多数性状间相关遗传力小于性状遗传力。当选择强度相等时，对一级枝梗数表型的选择可以明显提高二级枝梗数和穗粒数。对其他性状的间接选择相对效率都比性状的直接选择效率要低。相关遗传力通径分析表明，穗粒数表型对穗粒重的直接作用最大，其次为千粒重和二级枝梗数。各性状通过穗粒数都有最大的正向间接作用。因此，穗粒数对产量的贡献超过其他性状，是提高产量的关键因素。相关遗传力的应用，拓展了遗传力的概念，符合高粱育种实践，对确定杂交育种选择方案有很好的参考价值。

关键词: 高粱, 相关遗传力, 数量性状

Abstract: Multivariate genetic analysis was used to analyse 16 quantitative characters in sorghum.The results showed that most of the correlative heritabilities between characters were lower than heritabilities of characters. When selection intensity being equal, efficiencies of indirect selection to many characters were lower than that of the direct selection, and selecting primary branches according to its phenotype could increase secondary branches and grains per head obviously. The results of correlative heritabilities path analysis indicated that both the direct effect of grains per head on grain weight per head and the indirect effect of each character on grains per head were the highest among 10 yield characters. Grains per head,therefore,played a key role in improving sorghum yield.The analytic results of correlative heritabilities were coincided with the practices in sorghum breeding.

Key words: Sorghum, Correlative heritability, Quantitative character

中图分类号: 

• S514.01