海岛棉单株成铃性状的发育遗传研究

采用包括基因型与环境互作的加性-显性-母体遗传模型,分析了两年的海岛棉7个亲本及其21个F1组合不同发育期的单株成铃数资料。遗传方差分析表明,成铃前期遗传主效应与遗传×环境互作效应所占比例相当;成铃中期加性效应和显性效应的影响降低,显性×环境互作效应及母体×环境互作效应增加;成铃后期遗传×环境互作效应在8月2日上升至最大,之后逐渐下降但仍然起重要作用。控制单株成铃数的基因在成铃前期到7月17日表达比较活跃。同一遗传效应的非条件遗传相关多为显著的正值,而条件遗传相关则检测到显著负值与正值。两种分析方法的结合能充分阐明海岛棉成铃发育中的基因活动特点。结果表明:海岛棉单株成铃性状的发育遗传特点与陆地棉存在差异。

Genetic Analysis for Developmental Behavior of Boll Number Per Plant in Island Cotton

An additive-dominant-matemal model with genotypexenvironment interaction was applied to analyze developmental genetics for the boll number per plant at different stages in two years. The experimental data were obtained from seven island cotton varieties and their 21 F_1 crosses. It was showed that genetic main and GxE effects were predominant at the early boll stage.Additive and dominant effects reduced at the middle stage while D×E and M×E effects increased continually. At the late boll stage G×E effects increased to maximum at August 2, it reduced gradually since then but played a more important role than other effects. Gene expression was very active during prior stage of bolling to July 17. Significant unconditional positive correla-tion was detected for the same genetic effect while conditional correlation was positive or negative. The combination of two ana-lytic methods can explain clearly the gene expression feature for developmental behavior of boll number per plant. The results showed that the genetic developmental features of boll number per plant are different from upland cotton in island cotton.