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在大白菜的育种和良种扩繁工作中,利用萌动种子低温春化理论,可以省去营养生长阶段而直接开花、结籽,有效地缩短了生育周期,加快了育种进程。人工春化处理大白菜种子,一般20天即可。种子虽然放置在0～6℃的低温条件下,却仍在缓慢的生长。到播种时,胚根一般长达15～25毫米,子叶比刚萌动时也增长了2～3倍,自身顶上能力基本丧失,对环境条件的适应能力也大为下降。此时若措施不当,必然会严重地影响成活率。笔者在多年的大白菜育种、良繁和科学实验工作中,积累了一些经验,使成活率由30.3～68.8%,提高到95.7%。
In cabbage breeding and propagation of improved varieties, the use of germination seed low temperature vernalization theory, you can save the vegetative growth stage directly flowering, seed, effectively reducing the growth cycle and speeding up the breeding process. Artificial vernalization of Chinese cabbage seeds, generally 20 days can be. Although the seed is placed in the low temperature of 0 ~ 6 ℃, it is still growing slowly. To the sowing, the radicle is generally up to 15 to 25 mm, cotyledons also increased 2 to 3 times than just sprout, the basic loss of their ability to adapt to the environmental conditions greatly reduced. If improper measures are taken at this time, it is bound to seriously affect the survival rate. The author in many years of Chinese cabbage breeding, good propagation and scientific experiments, and accumulated some experience, so that the survival rate from 30.3 ~ 68.8%, increased to 95.7%.