在一年只种一季水稻的低温地区,育成一个新品种通常要花费十多年时间。但通过加速早期世代的进程,可以缩短育种年限。早在三十年代初期,日本就开始实行冬季利用温室加代F_1。利用温室或异地加速吐代进程,特别是异地加代已在国际上广泛应用。美国把低代材料送到中美洲的哥斯达黎加去加代。南朝鲜在国际水稻所的加代研究,获得一年4代的显 Breeding a new breed usually takes more than a decade in low-temperature areas where there is only one season of rice a year. But by accelerating the process of earlier generations, breeding years can be shortened. As early as the early 1930s, Japan started to use winter greenhouse plus F_1. Accelerate vomiting by using the greenhouse or off-site process, especially in the off-site plus has been widely used in the international community. The United States sent the younger generation materials to Costa Rica in Central America. South Korea in the International Rice Research Institute, won four generations a year significant