陆地棉棉铃与纤维品质性状的遗传协方差分析  

Analysis of Covariance Components between Boll and Fiber Traits in Upland Cotton

作　　者：汤飞宇[1] 王晓芳[1] 莫旺成[1] 肖小红[2] 肖文俊[1] 

机构地区：[1]江西农业大学农学院/作物生理生态与遗传育种教育部重点实验室/江西省作物生理生态与遗传育种重点实验室,江西南昌330045 [2]江西农业大学经济管理学院,江西南昌330045

出　　处：《核农学报》2013年第9期1285-1292,共8页Journal of Nuclear Agricultural Sciences

基　　金：江西省农业科技支撑计划项目(2006IB0200500;2009BNA03800;20112BBF60024)

摘　　要：采用加性-显性及其与环境互作的遗传模型,分析了陆地棉棉铃性状与纤维品质性状的各项遗传协方差分量。结果表明,绒长与铃纵径呈显著的加性和显性正相关,麦克隆值与铃横径呈显著的加性负相关,与铃形指数呈显著的加性正相关,比强度与铃横径和纵径均呈极显著的加性正相关。除整齐度外,其它4个纤维品质性状与3个棉铃形态性状的基因型相关以正向加性遗传相关为主,因此在低世代间接选择棉铃形态性状对改良纤维品质是有效的。绒长与单铃重、单铃纤维重、单铃种子重和单铃种子数均存在极显著的正向显性遗传协方差,比强度与单铃种子重呈显著的显性遗传正相关。纤维品质性状与4个棉铃内产量因子的基因型相关主要来自正向的显性遗传相关,表明可以通过杂种优势利用实现两者的同步改良。Seven boll traits and five fiber quality traits of nine parents and their 36 F1 crosses of upland cotton （Gossypium hirsutum L.） for two years and their genetic covariance components between pair-wise characters were analyzed by additive-dominance genetic model with genotype by environment interaction effects. Additive and dominance covariances between fiber length and boll length were positive and significant. Fiber uniformity was significantly and positively correlated with boll length and width in dominance effects. Micromaire showed significant and negative genetic correlation with boll width but positive with ratio of boll length to boll width in additive effects. Elongation was significantly and positively related with ratio of boll length to boll width in additive effects, as were fiber strength and boll width and boll length. Positive additive covariance is a main component of genetic covariance between three boll morphological traits and fiber traits, except uniformity, suggesting indirect selecting of boll morphological traits helpful to the improvement of cotton fiber in early generation of hybrid. Fiber length exhibited positive dominance correlations with boll weight, fiber mass per boll, seed mass per boll and single boll seeds at 0.01 level, but negative additive correlation with single boll seeds at 0.05 level. Significant and positive dominance correlations were found between fiber elongation and fiber mass per boll and single boll seeds, as were fiber strength and seed mass per boll. Positive genotypic correlations between fiber traits and four within-boll yield components are due to dominance genetic covariance, indicating those traits can be improved simultaneously by heterosis utilization.

关 键 词：陆地棉 棉铃性状 纤维品质 遗传协方差 

分 类 号：S562[农业科学—作物学]