论文部分内容阅读
根据多年玉米制种的经验,对其杂种优势退化原因进行了探讨,并提出了预防措施。明确引起玉米杂种优势退化的原因主要有:自交系扩繁过程中的混杂、制种过程中的混杂、父母本杂株混杂、人为混杂等,其预防措施主要有:(1)坚持集中制种与统繁联供相结合;(2)对自交系进行提纯复壮;(3)减少世代繁殖次数;(4)提高制种量;(5)严禁父本再利用;(6)制种过程对亲本进行严格去杂去劣。
According to many years of experience in seed production, the reasons for the deterioration of heterosis were discussed, and preventive measures were put forward. The main reasons for the clear degradation of maize heterosis are as follows: (1) Adherence to centralized control system (2) Purification and rejuvenation of inbred lines; (3) Reduction of generation multiplication; (4) Improvement of seed production; (5) Re-use of male parents is forbidden; (6) Seed production The process of strict derogation to the parent.