China is an origin center of Chinese cabbage {Brassica rapa L. ssp. pekinensis) which is one of the most important vegetables in Far East. Under the co-effects of natural evolution and artificial selection the leaf head serving as the nutrition deposited organ has been formed. Studying the mechanism of heading process is very important in practice, especially for the aim of increasing the yield and quality of Chinese cabbage. Unfortunately, the pace for studying the mechanism of heading formation is just at...