摘要： 通过对48个不同来源玉米自交系间的遗传距离测定和聚类分析，将其分为12类；探讨了遗传距离与杂种优势的关系。结果表明:(1)聚类结果与材料的亲缘关系和地理来源没有必然的内在联系，遗传距离不能代表亲本间遗传差异的大小，它可能反映的是材料间的形态差异。(2)玉米在籽粒产量上存在着明显的杂种优势，但与亲本间遗传距离的直线相关不显著，用遗传距离预测玉米杂种优势有其局限性。

关键词: 玉米, 自交系, 遗传距离, 杂种优势

Abstract: Forty eight inbre’s-lines of corn were divided into 12 groups by measurement of genetic distances and clustering analysis.The relationship between the genetic distance and heterosis in corn was also discussed.Conclusions were as follows: (1) None inevitable inner relation existed between the clustering results and the consanguinity, and geographical sources of these materials used in this study.Genetic distance could not stand for the genetic divergences of inbred-lines of corn; it might reflect the morphological differences of the inbred-lines.(2)Evident heterosis existed in yield, but had no significant linear correlation with the genetic distance.Therefore, to predict the heterosis in corn by means of genetic distances of inbred-lines is restricted.

Key words: Inbred-line of corn, Genetic distance, Heterosis

中图分类号: 

• S513