Vernalization of Seeds Effects on Bolting and Flowering of Different Varieties Chinese Cabbage on the Year

Seeds of embryonic root exposed of summer Chinese cabbage were studied on bolting and flowering through different vernalization days in fridge of four temperatures.The results showed that the longer Vernalization day,the larger bolting and flowering stage in the same one.Bolting and flowering stage of this three materials were difference in the same vernalization days.The verbalization day was nearly 25～35 days.