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采用 NC 设计方法 ,选用我国构建的 Bt( Bacillus thuringiensis)基因棉 GK3和美国构建的 Bt基因棉新棉 33B等 Bt基因棉为父本 ,配制杂交组合 ,分析了含 Bt基因杂交棉组合的性状优势表现及配合力效应。性状优势分析表明 ,组合的中亲优势和竞争优势明显 ,皮棉产量中亲优势率达 1 0 0 %,竞争优势率达 86.7%,多数品质性状较对照为优 ,表明转 Bt基因棉品系与常规品种间杂种优势利用潜力较大 ;通径分析表明 ,在增产因素中 ,铃重和铃数所起贡献较大 ;配合力分析表明 ,父本间和母本间的 GCA均方值均达显著或极显著水平 ,组合的 SCA均方值除子、皮棉产量性状外 ,其余均不显著 ,在 F1性状的遗传中 ,各性状的加性效应起主导作用 ;F1的性状表型值与父、母本的 GCA呈高度正相关 ,并达显著水平 ,表明选配含 Bt基因杂交组合时 ,选择GCA值大的亲本较为可靠
Using the NC design method, we selected the Bt gene cottons Bt (Bacillus thuringiensis) constructed in China and Gossypium barbadense Bt cotton constructed in the United States as the male parent to prepare hybrid combinations, and analyzed the advantages of hybrid cotton combinations containing Bt genes Performance and Cooperative Effect. The analysis of trait advantage showed that the middle parental advantages and competitive advantages of the combination were obvious. The pro-dominant rate of lint yield reached 100% and the competitive advantage rate reached 86.7%. The majority of quality traits were better than the control The potential utilization of the heterosis among cultivars was larger. Path analysis showed that the boll weight and boll number contributed more to yield increase. The analysis of combining ability showed that the GCA mean square values of male and female parents were all significant Or the extremely significant level. The additive mean effect of each trait played a leading role in the inheritance of F1 trait, except the squared mean squared SCA, lint yield trait, GCA of the female parent showed a highly positive correlation with a significant level, indicating that the selection of a parent with a large GCA value is more reliable when the hybrid combination containing the Bt gene is selected