摘要：为了分析转Bt基因棉花蛋白高表达品系的杂种优势和配合力，采用NCII设计，利用4个生产上推广应用的棉花品种与9个转Bt基因棉花蛋白高表达品系进行杂交组配，对36个组合的F1产量性状的杂种优势和配合力进行分析，结果表明：大多数组合的竞争优势明显，皮棉和籽棉的产量均具有较大的竞争优势，两者分别为16.1%和6.8%，皮棉和籽棉的产量的竞争优势率分别达到83.3%和80.6%。产量性状的优势大小依次为衣分、铃重和单株铃数，分别为3.7%、2.0%和0.8%。对组合的配合力方差进行分析，结果显示：九个转基因抗虫棉品系各产量性状的一般配合力差异较大，对这些组合特殊配合力进行分析，发现有3个组合具有较高的特殊配合力。

Abstract: For analysis on the heterosis and combining ability among Bt transgenic cotton high epression lines. The crosses were made by NCII design, using four elite commercial cotton culrivars as female parent and nine transgenic Bt cotton protein high epression lines as male parent, to analyze the competitive heterosis and combining ability effect for 36 combinations.The results showed that the heterosis for yield and yield traits were obvious in most combinations. of which lint and seed cotton yield were with more competitive advantage, both of them were 16.1% and 6.8%, respectively lint and seed cotton yield competitive advantage rate reached 83.3% and 80.6% respectively. There were positive heterosis in lint percentage,boll weight and boll number in most F1 hybrids; leading to average hetersises in three traits for 3.7%,2.0% and 0.8%, respectively. The results of variation analysis of combining ability showed that there are significant difference for general combining ability among nine transgentic Bt cotton protein high epression lines. three F1 hybrids taking on elite special combining ability were selected,