论文部分内容阅读
【目的】变褐时间是衡量烟叶耐烤性的一个重要指标,对其分析并阐明烤烟耐烤性遗传效应。【方法】通过在暗箱试验中统计烟叶变褐比例,算出变褐指数(BI=∑B/n)作为耐烤性量化标准,并应用主基因+多基因混合遗传模型的6世代联合分析方法,对2个杂交组合(云烟85×大白筋599和中烟100×翠碧1号)的6个世代群体(P1、P2、F1、B1、B2和F2)中部叶烤烟耐烤性状进行遗传分析。【结果】供试组合的烤烟品种耐烤性的遗传符合E-0模型,即由2对加性-显性-上位性主基因+加性-显性-上位性多基因混合控制。主基因都以负向加性效应为主,主基因遗传率都较高,其中F2群体最高;多基因遗传率都较低。【结论】基于烤烟品种耐烤性的遗传效应,重视亲本材料和高世代对耐烤性的选择是十分必要的。
【Objective】 Browning time is an important index to measure the roasted resistance of tobacco leaves, analyzing and clarifying the genetic effect of resistance to roasted tobacco. 【Method】 The browning index (BI = ΣB / n) was calculated as the quantitative standard of resistance to roasting by counting the percentage of browning of tobacco leaf in the black-box experiment. The 6-generation joint analysis method of mixed + The resistance traits of mid-leaf flue-cured tobacco from 6 cross-breeds (P1, P2, F1, B1, B2 and F2) of two crosses (Yunyan 85 × Daweijin 599 and Zhongyan 100 × Cuiwei 1) were analyzed. 【Result】 The results showed that the inheritance of resistance to roast tobacco of the tested combinations accorded with the E-0 model, which was controlled by two pairs of additive-dominance-epistatic major genes plus additive-dominance-epistasis polygene. The main genes are mainly negative additive effect, the main gene heritability is high, of which the highest F2 population; polygene heritability rates are low. 【Conclusion】 Based on the genetic effect of resistance to flue-cured tobacco, it is necessary to lay stress on the selection of roast resistance of parent material and high generation.