任何一个棉花新品种,随看推广应用面积的扩大,使用年限的延长,品种都会受天然异交生物的影响产生混杂退化,导致产量和纤维品质的下降。棉花杂交种同常规棉种一样,都存在着混杂退化的问题,而且它的防杂保纯,有 Any new varieties of cotton, with the extension of the popularization and application area and the extension of the service life of the varieties, will be mixedly degenerated by the effects of natural outcrossing organisms, resulting in the decline of yield and fiber quality. Cotton hybrids with the same conventional cotton species, there is the problem of mixed degeneration, and its anti-hybrid pure, there