1玉米自交系应尽量减少连续扩繁次数实践证明,玉米自交系连续扩繁次数越多种性退化愈严重,这是由玉米自交系本身特性决定的。玉米异交率高达95%以上,极易发生生物学混杂,因此,对骨干自交系应坚持一年繁多年用,搞好亲本储备。2繁殖区隔离要安全 Maize inbred lines should be to minimize the number of continuous propagation Practice has proved that the more continuous maize inbreds the more frequent sexual degeneration more serious, which is determined by the characteristics of maize inbred line itself. Outcrossing rate of maize up to 95%, prone to biological hybrid, therefore, the backbone of inbred lines should adhere to many years of year, do a good job of the parental reserve. 2 breeding area isolation to be safe