通玉179六世代和DH世代4个穗部性状对比分析研究

Comparative Analysis and Research of Four Ear Traits of Six Generations and DH Generation of Tongyu 179

对穗长平均优势较大的通玉179的F_(1)(PH6WC×29,Reid)进行了单倍体自然加倍规模化育种,并组建六世代群体,就穗长、行粒数、穗行数、穗粒数进行了六世代和DH世代最适模型的遗传参数分析。结果表明,六世代分离世代穗长多基因遗传力为0;行粒数、穗行数和穗粒数主基因遗传力范围分别为56.80%~97.82%、0~58.59%和65.08%~93.70%。DH世代穗长、行粒数、穗行数和穗粒数主基因遗传力分别为99.21%、96.35%、98.24%和93.36%。以上说明常规育种母本系选育应以行粒数为首要目标,从而达到最大穗粒数。DH育种应以穗长为目标,同时兼顾穗行数,有效实现最大穗粒数的育种目标。

F_(1)(PH6WC×29, Reid) with higher average ear length advantage of Tongyu 179 was selected for haploid natural doubling large-scale breeding, and the six generation populations were established. The genetic parameters of the optimal genetic model for ear length, grain number per row, row number per ear and grain number per ear in six generations and DH generation were analyzed. The results showed that the polygenic inheritance of the ear length was 0 and the main genetic inheritance of grain number per row, row number per ear and grain number per ear were 56.80%-97.82%, 0-58.59% and 65.08%-93.70%, respectively, in the sixth generation. The heritability of the main genes for ear length, grain number per row, row number per ear and grain number per ear were 99.21%, 96.35%, 98.24% and 93.36% in the DH generation, respectively. The results showed that the grain number per row should be the primary goal when breeding female parent lines in conventional breeding in order to achieve the maximum grain number per ear. DH breeding should aim at ear length and at the same time take into account row number per ear in order to achieve the goal of the maximum grain number per ear more effectively.