| This paper used the korla fragrant pear as test material, in order to control the fruit of fragrant pear postharvest black spot disease as the main purpose, respectively studied the UV-C treatment on fragrant pear postharvest storage quality and physiological activity, UV-C treatment inhibited the influence of occurrence mechanism of fragrant pear fruit postharvest black spot disease and UV-C combined with1-MCP treatment on fragrant pear fruit postharvest physiology and black spot disease. The results of the study on effective prevention and control, storage quality improvement and the delay aging of fruit of fragrant pear fruit postharvest black spot disease development, advocating green, non-pollution preservation methods in the use of horticultural products have very important practical applications.Researched UV-C treatment on the impact of quality and physical activity of fragrant pear, using different UV-C irradiation dose (2.5kJ/m2,5kJ/m2,7.5kJ/m2,10kJ/m2) on pear processing at room temperature (20°c,80%～85%RH) during storage. UV-C treatment can inhibit the decline in pear firmness and soluble solids, and slow down the degradation of chlorophyll;7.5,10kJ/m2dose UV-C treatment can effectively inhibit the growth of the pear black spot, reduce the incidence of fruit, reduce peak breathing, slow down the respiration rate, maintain a good quality and value of the goods in pear. In the UV-C treatment tested, the most significant effect of UV-C treatment is7.5kJ/m2.The fragrant pear by7.5kJ/m2UV-C treatment injury vaccination, at low temperature (-1℃,90%-95%RH) environment storage. From four aspects of storage quality, physical activity, active oxygen metabolism and disease resistance of fragrant pear, UV-C treatment inhibition fragrant pear fruit postharvest black spot disease the effect of occurrence mechanism. UV-C treatment can significantly inhibit the respiration rate and Increased cell membrane permeability, delayed breathing peak, slowed down fragrant pear hardness, soluble solids, chlorophyll content, Vc content, better to preserve the quality of the fragrant pear; UV-C treatment reduced the rate of O2produce rate and improved the activity of CAT, effectively reduced the membrane lipid peroxidation, delayed ripening and senescence of fragrant pear fruit; UV-C treatment increased PAL, POD, CHT, GLU defense enzyme activity, inhibited the growth of the disease spots, reduced the disease prevention rates of fragrant pear black spot, prolonged the fragrant pear storage life.Using lppm1-MCP combined with7.5kJ/m2UV-C composite treatment, after treatment divided into two groups, one group directly stored at low temperature(-1℃,90%-95%RH); another group after injury inoculation, stored at low temperature(-1℃,90%～95%RH). The fragrant pear storage quality, physical activity, ethylene synthesis and metabolism, active metabolism and disease resistance in five aspects, the study on the influence of physiology and black spot postharvest fragrant pear fruit by UV-C combined with1-MCP.The korla fragrant pear by the UV-C combined with1-MCP processing can significantly inhibit the growth of fruit disease spot and decline of its hardness, reduce the cell membranes permeability of the fruit peel, slow down the consumption of chlorophyll, inhibit the fruits of fragrant pear postharvest respiration, postpone the breathing peak. UV-C combined with1-MCP significantly slowed down produce rate of O2and maintain a higher SOD, CAT activity. Fragrant pear vaccination by UV-C combined with1-MCP treatment significantly enhanced the fruits defense enzymes PAL, POD, CHT, GLU activity, effectively restrained the growth of the black spot disease of fragrant pear, reduced the incidence of fruit, kept good quality and commodity value of fragrant pear. |
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