UV-C处理采后桃防御酶活性与贮藏效果研究

为探索无化学污染的UV-C处理果蔬保鲜途径及作用机制,用不同剂量UV-C照射采后"大久保桃",观察果实的发病率和发病指数,并对果皮防御酶活性变化进行了分析测定,结果表明,0.25～0.5kJ/m2剂量UV-C能较好地减轻果实贮期腐烂,推迟发病10～16d,发病率比对照降低5.1和3.2倍,显著降低了发病率,诱导了果实提高抗病性;0.25～0.5kJ/m2剂量UV-C诱导的果皮PPO、PAL与0.5kJ/m2剂量诱导的β-1,3葡聚糖酶活性提高的趋势与抗病性提高趋势相一致,表明这三个酶在诱导采后果实抗病性中发挥了相应的作用。

Study on Activity of Defense Enzyme and Storage Effects in Harvested Peach by UV-C Treatment

The disease incidence and disease index were counted and the activity of defense enzyme was analyzed in harvested "DA JIU BAO" peach after different UV-C doses irradiation in order to discover a new preservation method of fruits and vegetables which is no chemical remain in this paper. The results showed that 0.25～0.5 kJ/m2 dose UV-C irradiation can reduce the disease incidence and disease index, retard disease incidence 10～16 days; infection rate can decrease by significantly 5.1 and 3.2 fold with disease resistance of fruit induced. PPO, PAL and β-1,3 glucanase activity are enhanced by 0.25～0.5 kJ/m2 dose UV-C irradiation, these defense enzymes play important role in inducing disease resistance of harvested fruits .