陆地棉品种间杂种优势利用研究

以８个陆地棉品种为亲本，配制了６个单交组合和３个复交组合，对杂种的一些重要性状进行了研究。结果表明，单交种Ｆ１代比对照有明显的竞争优势，Ｆ２代优势下降，但大多数经济性状在Ｆ１与Ｆ２代之间存在正相关，Ｆ２代优势的衰退程度也因不同的组合而在较大差异，有的组合Ｆ２代仍具有较好的竞争优势，筛选出连续利用Ｆ１和Ｆ２代的高优势组合是完全可能的。

UTILIZATION OF HETEROSIS OF INTRASPECIFIC HYBRID OF Gossypium hirsutum LINES

single crosses and 3 double crosses derived from 8 G. hirsutum lines were used to test of Some important characters heterosis. The result showed that competitive heterosis existed signifincently in F1 progenies of single crosses, but depressed in F2 progenies. Most economic characters in F2 progenies were related with those in F1 progenies. Given high competitive heterosis of some crosses existed in F2 progenies, it was possible to select crosses with high competitive heterosis both in F1 and F2 generations.The reasons why hybrid has high yield were discussed.