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繁育指的是不育系的繁育,制种指的是供应大田生产用的杂种一代种子的配制。 (一)不育系的繁育 1.不育系的保纯繁殖不育系,就是以不育系与保持系进行回交而产生下一代不育系的种子。因此,不育系使用的年代越多,它的回交世代也越高。由于不育系长期连续使用,难免不出现少数恢复育性的现象。几年来的观察,确实是如此。育性恢复的原因,大体有四种:(1)在繁育过程
Breeding refers to the breeding of a sterile line, which refers to the preparation of a hybrid seed that is supplied to the field for production. (A) sterile line breeding 1 sterile line of pure breeding male sterile line, is the sterile line and the maintainer line back to produce the next generation of sterile seed. Therefore, the more the male sterile lines are used, the higher their backcross generation. Due to long-term continuous use of sterile lines, it is inevitable that there will be no minority fertility restoration phenomenon. Observations over the years, it is true. Reasons for fertility restoration, there are generally four: (1) in the breeding process