棉花海陆杂交纤维品质性状遗传参数分析

为了研究棉花海陆杂交纤维品质性状的遗传规律，本试验采用5个陆地棉品种（系）作母本与5个海岛棉品种（系）杂交，配制25个杂交组合，随机区组试验设计，重复2次。主要检测杂交种F1代纤维品质性状，以小区平均数进行相应的方差分析及遗传参数估计。结果表明：陆地棉亲本间变异除马克隆值外，其他纤维品质性状均差异显著或极显著，而海岛棉亲本间除伸长率外，其他性状均存在显著或极显著差异；各纤维品质性状双亲互作效应均不显著。另外，遗传参数结果表明：绒长、比强度和马克隆值的遗传变异系数与表型变异系数变化趋势基本吻合，且均大于环境变异系数。整齐度和伸长率的遗传变异系数均小于环境变异系数，说明整齐度和伸长率的变异中环境因素的作用不容忽视。绒长、比强度和马克隆值的广义遗传率较高，在采用海陆杂交改良棉花纤维品质性状时，适宜在早代选择优异株系。

Genetic Estimates for Fiber Quality Traits of Hybrids from Gossypium.Barbadense and Gossypium.Hirsutum

In order to study genetic analysis of fiber quality traits of interspecific hybrid of G.barbadense×G.hirsut um,five G.hirsutum varieties as female parents and five G.barbadense varieties were crossed,and 25 hybrids were obtained.The randomized block design was taken to 25 F 1 combinations.The results showed that there existed significant or extremely significant difference for main fiber traits except micronaire between upland cotton parents;in addition to elongation,other traits were significant or very significant difference between island cotton;and parents ＇ interaction for the fiber quality traits were not significant.The genetic parameters showed that the trend between genetic and phenotypic variation coefficient was consistent for fiber length,strength and micronaire,and all were greater than the environment.Uniformity and elongation of the genetic variation coefficient were less than the environment;this means that environmental factors can not be ignored in variation of the two traits.The broad inheritance of fiber length,strength and micronaire were high,so these traits should be selected in early generations,when good fiber quality traits of G.barbadense×G.hirsutum was utilized by interspecific crossing.