Crosses were made by using the new varieties (lines) of Hebe i province and Nucotn 33B, to analyze heterosis in the hybrids of transgenic Bt cotton.

• 利用河北省审定的棉花品种或新品系与美国抗虫棉新棉 3 3 B及我国自育的 2个抗虫棉品系配制杂交组合 ,分析了转 Bt基因杂交抗虫棉的优势表现。