Abstract: Cell ultrastructure of postharvest green mume being both treated and untreated were investigated.Reduction in chloroplast,appearance of chromoplast,degradation of mitochondria,rupture of vacuole,dissolution of middle lamella and relaxation of microfiber array caused the in softening of the fruit.The treatment of 20mg/L GA3,2％CaCl2 and 1.0g/kg ethylene absorbent aided in keeping middle lamella and vacuole intact respectively,while hot air 2d treatment had more effects on cytoplast than on cell wall.

Key words: Green mume Postharvest treatment Cell wall Ultrastructure