陆地棉隐性核不育系与海岛棉种间杂种优势及配合力分析

以 4个陆地棉隐性核不育系和 2个海岛棉品种为试材 ,按 NC 设计 ,对陆地棉隐性核不育系在陆海杂种优势中的利用进行了研究。结果表明 ,多数组合皮棉产量具有中亲优势 ,最大达到 1 7.1 %。单株铃数、子指具有明显的中亲优势 ,而衣分、铃重的中亲优势为较大的负值。与陆地棉对照相比 ,全部组合均明显减产。配合力分析表明 ,铃重、衣分、子指、衣指、纤维伸长率和马克隆值主要受基因加性效应控制 ,而皮棉产量、单株铃数、单株果枝数、2 .5%跨距长度和比强度同时受基因加性和非加性效应作用 ,双 56和抗 A1是两个较好的不育系

Heterosis and Combining Ability of Interspecific Crosses between Recessive Nuclear Male Sterile Lines of Gossypium hirsutum and G. barbadense

Heterosis and combining ability of interspecific crosses between 4 recessive nuclear male sterile lines of Gossypium hirsutum and two cultivars of G. barbadense were studied. Most of the crosses had mid-parent heterosis for lint yield , the largest one reached 17.1%. Bolles/plant and seed index had marked mid-parent heterosis, while lint percent and boll weight′s was markedly negative value. Compared with a commercial upland cotton ,the marked reduction (28.8%) in fiber yield was received in all crosses. Analysis of combining ability showed that lint yield , bolls/plant , branches/plant , 2.5% length and strength were controlled by both additive and non-additive gene effects , while boll weight , lint percent , seed index , lint index , fiber elongation and micronaire were controlled by additive gene effects. The double recessive male sterile (ms5ms6) line and Kang A1 were both good parents for the most traits.