短季棉早熟性状及产量构成因素的遗传分析和选择策略

Inheritance Analysis and Selection Strategies on Earliness and Yield Components of Short-season Cotton

对9个早熟及产量性状的有关遗传参数进行了相关分析和通径分析,结果表明,高强度选择可使目前推广品种(系)的丰产性和早熟性得到进一步改善;育种选择策略应从提高株铃数和衣分入手,选择第一果枝节位低、开花早、脱落少和铃不太大的类型,其中早代果枝节位严选,开花期、结铃率和衣分大群体选择,株铃数连续选择,就可实现培育出高产、早熟品种(系)最终目标.

Correlation and path coefficient analyses were made on the main inheritance parameters of 9 earliness and yield characters. The result showed that the early-maturing and high-yielding capacities of varieties spreading at present could be improved through the intensive selection.In the selective strategies of breading of short-season cotton the increasing of boll number per plant and lint percentage should be taken as the point of departure. At the same time the attention should be paid to such characters as lower sympodium node, earlier blooming period, less boll abscission and medium-sized bolls. Among these characters the sympodium node should be. taken as focal point of selection in early generation, such characters as blooming period,boll-setting rate and lint percentage should be selected in large population, and character of boll number per plant should be selected successively. In this way the cotton varieties (lines) with high yield and earliness would be seccessfully cultivated,