对墨西哥半野生棉转育后代中的显性无短绒具长绒和隐性核不育光Ａ材料进行遗传鉴定表明，光Ａ不育性受ｍｓｃ１基因控制。控制光籽特性基因与显性光籽Ｎ１为非等位基因。光Ａ光籽纯合态为低衣分，杂合态为高衣分。在遗传背景相同下，光籽组合产量优于毛籽组合。但因光Ａ纯合态的低衣分，其亲本繁殖和杂交制种时皮棉产量降低，故光Ａ不育系在杂种优势中的利用有优势又有劣势。 Genetic identification of the dominant non-cashmere plush and recessive nuclear-infecting light A materials from progeny of semi-wild cotton in Mexico indicated that light A sterility was controlled by the msc1 gene. Control of light-trait gene and dominant light-seed N1 are non-alleles. Light A light-seed homozygous low-coat points, heterozygous for high-coat points. Under the same genetic background, the yield of light-seed combination is better than the combination of wool seed. However, due to the light A homozygous low-lint, the lint yield of its parental breeding and hybrid seed production is reduced, so the utilization of the light-A male sterile line in heterosis has advantages and disadvantages.