柑橘日灼病果皮抗氧化代谢的变化

 以砂糖橘、贡柑、红江橙和暗柳橙为试材，调查其田间日灼率和果实日灼后果皮抗氧化水平的变化。结果表明，不同品种田间日灼率不同；果实发生日灼后果皮组织中超氧阴离子自由基大量积累，脂氧合酶（LOX）活性显著增强，脂质过氧化产物丙二醛（MDA）含量显著上升，加剧细胞膜脂过氧化。超氧化物歧化酶（SOD）活性、抗坏血酸（AsA）和谷胱甘肽（GSH）含量均显著下降，过氧化物酶（POD）和多酚氧化酶（PPO）活性均显著增强，说明其抗氧化代谢失调。

Changes in Antioxidant Metabolism in the Fruit Pericarps of Citrus During Sunburn Development

Fruit sunburn rates of four citrus varieties such as‘Shatangju’，‘Gonggan’，‘Hongjiang’sweet orange and‘Anliu’sweet orange were investigated. Fruits were used as materials to find out the changes of antioxidant level. The results showed that the fruit sunburn rates were different in different citrus varieties. After fruit sunburned，superoxide anion was significantly accumulated in pericarp，lipoxygenase（LOX）activity and malondialdehyde（MDA）content significantly increased，leading to aggravation of cell membrane lipid peroxidation. Correspondingly，superoxide dismutase（SOD）activity，ascorbic acid（AsA）and glutathione（GSH）contents decreased significantly，peroxidase（POD）and polyphenoloxidase（PPO）activities were significantly enhanced. These results indicated that the epidermal antioxidant metabolism in fruit was disordered after fruit sunburned.