高粱抗旱性状的变异系数与杂种优势

对6个杂交种及其相应亲本在水地、旱地两种环境条件下9个性状的变异系数和杂种优势进行了统计分析。变异系数旱地变幅较大，表现在二级技梗数的变异上，水地变异幅度相差2．3倍，而旱地变异幅度则相差4．4倍。在杂种优势的表现上，水地明显超过旱地，这说明培育高产抗旱杂交种的难度所在。从而提出在旱地育种上，在注意提高茎叶重的前提下，直接选择二、三级枝梗数多的材料，有可能培育出抗旱和杂种优势强的杂交种。

A Study on the Coefficient of Variation and Heterosis of Drought Resistant Characters in Sorghum

Six sorghum hybrids and their parents were used to study the coefficient of variation (C.V) and heterosis of 9 characters in irrigated and non-irrigated conditions. The results indicated that the C. V of the characters,especially the secondary branches of panicle were much more changable in non-irrigated condition than in irrigated condition. The heterosis of the characters under irrigated condition was greater than that under non-irrigated condition. The results a1so suggested that the emphasis of sorghum breeding for drought resistance should be placed on the selection of secondary and third branches.