温热玉米杂交种基本营养生长期遗传的初步研究

A Preliminary Genetic Study on the Basic Vegetative Growth Stage of the Hybrids Between Subtropical and Temperate Lines in Maize

用 2个温热杂交组合的P1,P2 ,F1,F2 ,BC1,BC2 6个世代材料 ,对玉米抽雄、散粉、吐丝期进行遗传研究。结果表明 ,不同温热杂交组合基本营养生长期的遗传特点不同。由对光周期反应较迟钝的亚热带自交系CML32 2所配成的温热杂交组合 ,其基本营养生长期较之亲本有明显提早的趋势 ,符合加性—显性遗传模式 ;温带早对亚热带晚呈显性或部分显性 ;对光周期反应敏感的亚热带自交系CML312表现异常 ,基本营养生长期指标在自交系内及其F1内变异较大 ;对含有杂合基因型分离世代F1,F2 ,BC1,BC2 的比较可见 ,明显表现杂合基因型倾早的遗传特点 ,温带遗传成分在杂种后代中所占的比重 。

This paper reported genetic performance of the basic vegetative growth stage using P 1,P 2,F 1,F 2,BC 1,BC 2 generations from 2 temperate×tropical combinations. The results showed that the performance of the days to anther, days to shed and days to silk has an earlier tendency for the cross than for the parents in the combination of 340 (temperate line) ×CML322 (subtropical line with insensitive to photoperiod), and inheritance of the basic growth period belonged to the genetic model of additive dominance. The performance of the basic vegetative stage in the CML312 line with sensitivity to photoperiod is abnormal with higher CV within the line and F 1. The early tendency of heterogeneous genotype and the quantitative effect for earlier days to anther, days to shed, days to silk because of the different temperate genetic component ratio in 6 generations were observed.