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利用有标记性状的棉花自交系，提高杂种个体的杂合程度和群体基因型纯度，Ｆ１代产量性状表现出了较强的生产优势和优亲优势。４４个不同组合的杂种一代，有３３个组合皮棉比对照中棉所１２增产。其中１５个强优势组合平均生产优势为４９．２６％，超过了目前品种×品种生产优势在３０％左右的幅度；有优亲优势的２９个组合，平均超亲６３．２５％。自交系Ｙ２－２具有无腺体、超鸡脚叶的标记性状，易繁种保纯。衣分、铃重、配合力高。杂种二代分离严重，生产上不能再利用。通过标记性状选育纯合自交系，利用品种（系）和自交系杂交，是提高杂种优势的一条途径。
Using indica-trait cotton inbred lines to improve hybrid heterozygosity and population genotype purity, the F1 generation yield traits showed strong production superiority and superior superiority. Forty-four hybrids with different combinations had 33 combinations of lint yielding more than CK. Among them, the average production superiority of 15 strong combination was 49.26%, which surpassed that of current cultivar × cultivar with the advantage of 30%. There were 29 combinations with superior progeny with an average of 63.25% super-progeny. Inbred line Y2-2 has no gland, super chicken foot leaf marked traits, easy breeding species of pure. Clothing points, boll weight, with high. Second generation of hybrids severely separated, the production can not be reused. Breeding of homozygous inbred lines by marker traits, using varieties (lines) and inbred lines, is a way to improve heterosis.