Genetic association of within-boll yield components and boll morphological traits with fibre properties in upland cotton (Gossypium hirsutum L.)

摘要

Knowledge of genetic relationships between within-boll yield components and fibre quality is essential for simultaneous improvement of lint yield and fibre quality in upland cotton (Gossypium hirsutum L.). Nine parents and their F-1 progeny with reciprocals from a 3 x 6 factorial mating design were grown in 2008 and 2009. Seven within-boll yield components and two boll morphological traits and the three fibre quality parameters were analysed based on a conditional additive/dominance (AD) genetic model. Results showed that boll length contributed in the largest proportion of phenotypic, additive and dominance variances for UHM length; seed index contributed to the largest proportion of phenotypic and additive variances for fibre strength; boll width made the largest contribution to phenotypic and additive variances and the second largest contribution to dominance-by-environment interaction variance for micronaire, indicating that they played an important role than the other traits for fibre length, strength and fineness/maturity, respectively. It is worthy of note that those correlations between boll shape and fibre quality apply only to the nine parents and die resultant hybrids in this study and do not imply a cause and effect relationship