Effects Of Vernalization On Chinese Cabbage Flower Bud Differentiation

Using four Chinese cabbage cultivars, the effect of temperatures, days, different GA3 concentrations and the times of using GA₃ on flower bud differentiation and bolting were studied. The aim was to provide theoretical basis and technical assistance for collecting seeds of Chinese cabbage. The main results were as follows:The developing process of the flower bud differentiation of Chinese cabbage is divided into six stages: no differentiation phase; prepared differentiation phase; flower bud initiation; sepal differentiation phase; stamen and pistil differentiation phase and petal differentiation phase. The top flower of the inflorescence differentiated earlier than lateral flower.The Chinese cabbage went to sexual development earlier and faster after its seeds vernalized under the treatment of 4⁸℃. At 10℃, Chinese cabbage could be vernalized, but relative longer time is needed. The longer time of illumination is beneficial to the process of flower bud differentiation and bolting.The experiment indicated the index of flower bud differentiation for 20 days at 6℃ was the best. At the same time, if more generations are required in a year, the time can be shorten to 15days.Chinese cabbage bolting and bloom can be accelerated remarkably by spraying 1500 mg/L gibberellin's(GA3) for two times, so the number of the first divarication and the seed quality and yield can be increased.