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.
国家科技期刊平台
NSTL
万方数据
维普
