采后蛋氨酸处理对桃果实青霉病及活性氧代谢的影响
Effect of postharvest methionine treatment on blue mould and reactive oxygen metabolism in peach fruit
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摘要: 以桃果实为材料,研究了采后不同浓度蛋氨酸处理对损伤接种桃果实扩展青霉（Penicillium expansum）病斑扩展的影响,根据病斑直径的大小筛选出能够有效抑制桃果实青霉病的最佳浓度,并以最佳浓度处理桃果实分析对活性氧代谢的影响。结果表明,15 mmol/L蛋氨酸对P.expansum的抑制效果最好,并且处理显著（p≤0.05）提高了桃果实中抗坏血酸（AsA）和还原型谷胱甘肽（GSH）含量;谷胱甘肽还原酶（GR）活性、抗坏血酸过氧化物酶（APX）活性和过氧化氢酶（CAT）活性也显著提高,同时提高了H2O2含量。由此表明,采后蛋氨酸处理可以通过调节桃果实体内活性氧代谢来提高果实对青霉病的抗性。Abstract: Peach fruit was used as materials to study the effects of postharvest methionine treatment on lesion development of peach fruit inoculated with Penicillium expansum.The optimum concentration of methionine was selected according to the lesion diameter,and then to analyzing the effect of methionine on the reactive oxygen metabolism in peach fruit.The results indicated that methionine at the concentration of 15 mmol/L effectively inhibited lesion development of peach fruit inoculated with P.expansum.The results also indicated that methionine treatment significantly( p≤0.05) increased the content of ascorbic acid(AsA) and glutathione(GSH),enhanced the activity of glutathione reductase(GR),ascorbate peroxidase(APX) and catalase(CAT) and the content of H_2O_2 in peach fruit. The results suggest that postharvest methionine treatment could improve the resistance of peach fruit against P.expansum by regulating the reactive oxygen metabolism.
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