陆地棉早熟性状多世代联合遗传分析

摘要

[Objective] This study aimed to research patterns of inheritance of earliness-related traits in continuous generations of upland cotton.[Method] The inheritance of six earliness traits was analyzed by joint segregation analysis under a mixed genetic model comprising a major gene plus polygenes in five generations (P1,P2,F1,F2 and F2:3) derived from a Zhong 751213 × Lumianyan 28 cross.[Result] Plant height and the node of the first fruiting branch were fitted by a model involving a pair of additive-dominant major genes plus additive-dominant-epistatic polygenes (D).Time from sowing to flowering was fitted by a model corresponding to a pair of completely dominant main genes plus additive-dominant polygenes (D-3).The entire growing period was fitted by a model representing a pair of additive-dominant-epistatic major genes plus additive-dominant-epistatic polygenes (E).The flowering and boll-setting period and the height of the node of the first fruiting branch were fitted by a model consisting of a pair of negatively completely dominant main genes plus additive-dominant polygenes.[Conclusion] The results of this genetic analysis of earliness traits using a major gene plus polygene mixed inheritance model should aid the elucidation of genetic mechanisms underlying earliness characteristics of upland cotton.%[目的]旨在探讨连续世代陆地棉早熟性状遗传规律.[方法]以陆地棉中751213和鲁棉研28为亲本,通过对P1,P2,F1,F2和F235个世代联合分析,研究株高、果枝始节、始节高度、花铃期、播种至开花和全生育期等早熟性状的遗传模型.[结果]株高和果枝始节的最佳模型为1对加性-显性主基因+加性-显性-上位性多基因混合模型(D);播种至开花时间最佳模型为1对完全显性主基因+加性-显性多基因模型(D-3);全生育期最佳模型为2对加性-显性-上位性主基因+加性-显性-上位性多基因模型(E);花铃期和始节高度最佳模型均为1对负向完全显性主基因+加性-显性多基因模型(D-4).[结论]上述对陆地棉早熟性状的混合遗传模型分析结果,有助于阐明陆地棉早熟性状遗传规律.