论文部分内容阅读
目前种子公司制种用玉米自交系,都有不同程度的混杂退化现象。众所周知,玉米是异花授粉作物,比白花授粉作物更容易混杂,所以在制种过程中防杂保纯尤为重要。据有关资料,用纯度不高的自交系制种比用纯度高的自交系配制成同名的杂交种,一般减产15～20%。用纯度低的自交系制种会降低杂种优势,杂交种高产性能就难以表现。
At present, seed production of corn inbred lines, have varying degrees of mixed degradation. As we all know, corn is cross-pollinated crops, pollination more easily than the white flowers mixed, so hybrid seed in the production process is particularly important. According to relevant information, it is generally 15% to 20% less than the purity of the inbred lines used to make the hybrids of the same name with the ones of the high purity inbred lines. The use of low purity inbred lines will reduce the heterosis, high yield hybrid performance is difficult to show.