自交系纯度的高低直接影响到杂交种的质量。在亲本自交系的繁育过程中,常把繁殖和提纯割裂开来的做法是不对的。面对当前玉米杂交种亲本自交系混杂的事实,总结经验,对今后进一步推广玉米杂交种,保持杂交优势大有好处。实践证明,从已经混杂的自交系中重新提纯,即使经过几代能使性状整齐一致,但与原来的自交系比较仍有很大的差异。为了做 The purity of inbred lines directly affect the quality of hybrids. It is wrong to often separate breeding and purification during the breeding process of the parental inbred lines. Faced with the fact that the current inbred lines of maize hybrids are interbred, summarizing the experience, it is of great benefit to further popularize the maize hybrids in the future and maintain the heterosis of hybridization. Practice has proved that, from the already inbred inbred lines in the re-purification, even after a few generations to make the characters neat, but compared with the original inbred lines are still very different. In order to do it