Change Of Active Oxygen Metabolism In Postharvest Apricot Fruit And Its Regulation

In this prosentation,the auther has studied the changes of active oxygen metabolism and chemical regulation in Apricot (Prunus armeniace L) fruit after harvesting .By researching the change of active oxygen metabolism in natrul ripening and senescence process of postharvest apricot fruit, analying the delayed colour change between green matirty and yellow matirty apricot fruit in ripening and senescence process after harvesting by GA3 and effect of GA3 and CEPA on active oxygen metabolism in posthavest apricot fruit,and a chemstory fresh-keeping agents using GA3 as core, the auther proposes a large-scale,simple, energy-savig apricot storage operation and technology.The results were summaried as follows:(1) The colour metabolism was very active druing natrul ripening and senescence process of apricot fruit. The levels of chlorophyll and flavonoids were obviously decreased, a lot while the contents of carotenoid and anthocyanin were considerably increased. The changes may be caused by reducing of POD activity and extreme significant accumulation of H2O2, which weill accelerate the damage of membrance lipid perioxidation.(2)There were the obvious characters of chlorophyll degradation and anthocyanin accumulation during ripening and senescence in postharvest apricot fruit. GA3 treatment on green and yellow matirty apricot fruit can significantly inhibite degradation of chlorophyll, caroteniod and anthocyanin accumulation, increase activity of POD, and decrease activity of PPO compared with control group. GA3 treatment prerentes the colour changes of apricot fruit afterharvesting and prolonges its storage period.(3)The fruit ripening and senescence process is the telangiectasin of membrance lipid preoxidation process. GA3 treatment can signifecantly enhance ethylene releasing and production of active oxygen, increase activities of SOD and POD, reinforced cleaning action of active oxygen, and decline the damage of membrane lipid preoxidation. All these results indicated that GA3 treatment can delay ripening and senescence process of postharvest apricot fruit. On the countary, CEPA treatment can obviously stimulateendogenous ethylene forming, promote production and accumulation of active oxygen, reduce activities of SOD and POD, accelerate ripening and senescence process and fruit softening of apricot fruit.(4)After coordinating correlated storage methods, the chemstory fresh-keeping agents using GA3 as core can effective prolong fruit storage preoid 5 to 7 days, the intacted nut percentage is up 85%. It indicates that the preseventin as a simple, energy-saving technology and was worth to entension and application.