Changes of Freeze-Fracture Ultrastructure and 27 kD Polypeptide of Photosynthetic Membranes During the Germination of Lotus Seeds Under Light COMPAPATIVE ANALYSIS OF THE ULTRASTRUCTURE OF PHOTOSYNTHETIC MEMBRANK IN AMMOPIPTANTHUS MONGOLICUS AND ARTEMISIA ORDOSICA WITH RELATION TO DROUGHT STRESS THE ANALYSIS OF ULTRASTRUCTURE OF PHOTOSYNTHETIC MEMBRANE ON CREMAVTHODIUM DISCOIDEUM ANDACONITUM TANGUTCUM IN ALPINE PLANT