棉花杂种优势利用主要有三种途径:即人工去雄法、核雄性不育两系法和胞质不育三系法。胞质不育三系由于细胞质的减产效应和恢复系单一,未能实现商业应用;我国大部分单位采用人工去雄法生产杂交棉种子,但F1代种子生产的高劳动投入已成为人工去雄法大规模利用的“瓶颈”;以四川农 There are mainly three ways to utilize the heterosis of cotton: the artificial male-male method, the two-line nuclear male sterile method and the three-line method of cytoplasmic male sterility. Most cytoplasmic male sterility lines did not produce commercial applications due to the single cytoplasmic yield reduction and restore system. Most of the units in China used artificial de-homing methods to produce hybrid cotton seeds. However, the high labor input in the F1 generation seed production has become an artificial dehuman Large-scale use of law “bottleneck” to Sichuan agriculture