陆地棉纤维细度相关性状的遗传及相关性分析

Genetic and Correlation Analysis on Fiber Fineness-related Traits in Upland Cotton(G.hirsutum L.)

利用主基因与多基因混合遗传模型的P1、P2、F1、F2四世代联合分析方法,研究了棉花纤维细度相关性状的遗传,进一步明确了主基因存在的普遍性。同时,对麦克隆值密切相关的纤维线密度及成熟度比率进行了F2、F2:3家系的主基因-多基因单世代分析,初步判定线密度也存在一对主基因。性状间的遗传相关分析表明,麦克隆值及成熟度比率与整齐度分别呈极显著正相关和不相关,该两个性状与其它性状的相关性两个世代表现不一致;线密度与整齐度呈正相关,与伸长率呈极显著负相关,与长度、强度及衣分不相关。线密度与各性状的相关性要比麦克隆值和成熟度比率稳定,受环境影响小,有必要加强线密度的选择及深入研究。

The method of joint analyses of multiple generations with P1, P2, F1 and F2 of major gene plus polygene mixed inheritance model was used to analyze the genetics of fiber fineness related traits in the study. The results showed that fiber strength, length and uniformity were controlled by one or two major gene and poly genes. Micronaire was as an indication of both fineness （linear density） and maturity （degree of cell-wall development）. The method of major gene plus polygene inheritance model with single segregating generation of F2 or F2：3 were used to analyze the traits of linear density and maturity ratio. The results showed that there was one major gene for linear density. And the correlation analysis indicated that it was possible to produce long, strong and uniform fibers with good elongation. Micronaire was positive significantly correlation with uniformity and the inconsistent correlation of two generations with length, strength and elongation. Maturity ratio was not significantly correlated with uniformity and the inconsistent correlation with other traits. Linear density was positive significantly correlated with uniformity, negative significantly with elongation and no signification with fiber length, strength and lint percentage. This indicated linear density was more stable than micronaire and maturity ratio, so it is necessary to strengthen the study of linear density.