Abstract: The differentiation of floral buds of spring rape(Brassica campestris L.)in QinghaiProvince was studied in the past five years.According to the investigation of paraffin section and directed observation under optical dissection microscope,it was found that thedifferentiation of the floral organ of s

Key words: Spring rapeseed（Brassica campestris L.）, Differentiation of floral bud, Petaline primordium, Size of floral bud