论文部分内容阅读
玉米是异花授粉作物,每个品种就是一个杂种群体。因此,品种间杂交种的杂种优势不显著。只有选育成自交系再杂交,产生的杂种一代,才能表现出强大的杂种优势。玉米自交系的选育方法是:在一个品种中选择若干优良单株套袋自交,第二年将自交第一代接穗种成行,淘汰生长差的穗行,继续进行自交。第三年再种成穗行,选优去劣,进行自交,这样连续自交若干代,得到性状稳定、生长整齐一致的植株,就是自交
Corn is cross-pollination crops, each species is a hybrid population. Therefore, the hybrid heterosis between varieties is not significant. Only breeding inbred lines and then hybrid, resulting hybrid generation, to show a strong heterosis. Breeding methods of maize inbred lines are as follows: selecting some elite bagging self-inbreds in one variety, self-crossing first-generation scion line in the second year, eliminating poor-growing ear lines and continuing selfing. In the third year and then grow into a row, select the best to poor, self-self, such self-continuous generations of generations, get stable and consistent growth of plants, is self-self