向日葵亲本配合力分析

Analysis of the Combining Ability of Parent Materials in Sunflower

摘要:

采用5×7不完全双列杂交设计，对5个不育系、7个恢复系的8个性状进行配合力分析，并计算了相应的遗传参数。结果表明：杂交种的产量与双亲的一般配合力及特殊配合力呈显著正相关，一般配合力效应大于特殊配合力效应；除空瘪率这一性状的加性作用与非加性作用同等重要外，其余7个性状的加性方差均大于非加性方差，加性效应占主导地位；株高、皮壳率、单株粒数的遗传方差大于环境方差，遗传力较高，可早代选择；百粒重、葵盘直径的遗传方差与环境方差之比近于1，遗传力不高；小区产量、单株粒重、空瘪率的环境方差大于遗传方差，这些性状不易早代选择。

Abstract:

Combining ability analysis were conducted for eight traits of 5A-lines and 7R-lines with 5 × 7 incomplete diallel design and corresponding genetic parameters were calculated. The results indicated: A significant positive correlation exists between the plot yield of hybrid and general combining ability and specific combining ability of parents. Additive varianles of 7 traits were higher than their non-additive variances exceptrate of the empty seed that additive effect was as important as non-additive effect.The additive effect was much more important than the non-additive effect. Gene variances of plant height, seed number per plant etc were higher than their environmental variances and have high heritability relatively, so the selection should he in early generations. Gene variances of hundred seed weight, diameter of flower dish were as same as their environmental variances more or less and their heritability were not high relatively. The environmental variances of the plot yield, seed weight per plant etc were higher than their genetic variances, they should not be selected in early generations.