THE STUDY OF ULTRASTRUCTURAL CHANGES IN THE SHOOT APEX OF BRASSICA CAMPESTRIS SSP. PEKINENSIS (LOUR) OLSSON. VAR. CEPHALATA TSEN ET LEE. DURING ITS ONTOLOGENY

Miao Mingsheng, et at (Department of Biology)  

We have studied the ultrastructural changes in the shoot apex of Brassica campestris ssp. pekinensis(Lour.)Olsson by means of electron microscopy. From the investigation of ultrastructure in the shoot apex, it was shown that the vegetative shoot apex comprises promeristem, general meristem and fundamental tissue. While in the reproductive apex only the latter two ones occured. And it was found that in the cells of reproductive apex there are a great many crystal structures and concentric ringed cisternae,of which only a few are found in the cells of vegetative apex. So the two kinds of apex are not only different in morphology, but also different in physiological metabolic patterns.

【Key Words】： vegetative apex reproductive apex concentric ringed cisternae crystal structure

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