论文部分内容阅读
两年分别用两个 T 型不育系和两个恢复系轮配成4个杂交组合、连同亲本和对照、设置7种密度、研究了群体密度对 T 型杂种小麦主要性状及其杂种优势的影响.结果表明,各性状在密度间都存在着显著的差异、且有一定的变化规律;各性状的杂种优势、恢复度和自然结实率都随密度增加而下降。通过对杂种小麦产量及杂种优势标准化回归方程联立求解和对产量回归方程求导的方法、确定了杂种小麦的适宜密度范围。最后提出了合理利用密度效应、充分发挥小麦的杂种优势应采取的栽培措施.
Two crosses of two T-type CMS lines and two restorer lines were made into four crosses for two years. Seven densities were set with the parents and controls to study the effects of population density on the main characters and their heterosis The results showed that there was a significant difference in the density among all traits, and there was a certain variation trend. The heterosis, the recovery degree and the natural seed setting rate of all the traits decreased with the increase of density. Through the simultaneous solution of the regression equation of the yield and heterosis of hybrid wheat and the method of derivation of the regression equation of yield, the suitable density range of hybrid wheat was determined. In the end, the cultivation measures should be taken to make rational use of the density effect and give full play to the heterosis of wheat.