摘要： 以6个转Bt基因陆地棉作为亲本材料,按完全双列杂交(Griffing4)设计,从16个性状指标上对其品种间杂种优势和配合力进行研究。结果表明,杂种F1具有明显的优势,测试的16个性状中有13个性状具有正向中亲优势,5个性状具有正向超高优势,14个性状具有正向竞争优势。通径分析表明:在增产因素中,株高、单铃重和衣分所起的作用大。配合力分析表明:16个性状的遗传变异主要产生于基因的加性效应,而籽棉产量、皮棉重、果枝数、单铃重、衣分、烂铃率、比强度和纤维长度的非加性效应也很强;冀棉616(P5)和衡棉4号(P1)是优良的高产亲本,冀棉228(P6)是良好的优质亲本;筛选出8个高优势组合,其中3个为丰产组合P1×P2、P4×P5、P1×P4,3个为优质组合P5×P6、P2×P5、P3×P4,2个为高产优质组合P2×P6、P3×P5。

关键词: 转Bt基因抗虫棉, 杂种优势, 配合力

Abstract: Crosses were made by Griffindesign,using 6 transgenic Bt cotton varieties as parents,to analyze heterosis of F₁ hybrids and the combining ability from 16 traits. F₁ hybrids showed an appreciable heterosis. 13 of 16 characters measured had mid-parent heterosis, 5 showed high-parent heterosis and 14 expressed competitive heterosis. Path analysis indicated that plant height, single boll weight and lint percentage contributed greatly to the increase of output of the yield components. Combining ability analysis showed that the additive effects were predominant in F₁ traits but non-dditive effects of seed cotton yield,lint yield,number of fruit branches,single boll weight lint percentage,rate of rotten boll fiber strength and fiber length were also very strong. Jimian 616 and Hengmian 4 were high vied parents and Jimian 228 was a good quality parent with high genetic combining ability. 8 excellent combinations were selected from 15 F₁ hybrids,3 of which were high yield P1 × P2,P4 × P5,P1×P4,3 were good quality PS × P6,P2 × P5,P3 × P4 and 2 were high yield and good quality P2 × P6,P3 × P5.

Key words: Transgenic Bt cotton, Heterosis, Combining ability

中图分类号: 

• S562.03