The six cultivars of Chinese cabbage that were significantly different in winter were used to study the effects of 4 vernalizational temperature on flower bud differentiation and bolting. Results showed,for weaker winter materials,the flower bud differentiation and bolting were finished in a short time,with the temperature range from 3℃~11℃.While for the strongest winter materials,the optimal temperature is within range of 3℃~11℃. On the contrary,when temperature excess 7 ℃, flower bud differentiation and ...