SO_2对龙眼果实的氧化作用与衰老的影响

Effects of SO_2 Treatm ent on the Oxidation and Senescence of Longan Fruit

以‘石硖’龙眼（Ｄｉｍ ｏｃａｒｐｕｓｌｏｎｇａｎ Ｌｏｕｒ．ｃｖ．Ｓｈｉｘｉａ）为试材，研究了冷藏（４ ℃）条件下，适当的ＳＯ２ 熏蒸预处理对果实氧化作用与衰老的影响。结果表明：硫处理果实，呼吸速率比对照显著降低（Ｐ＜ ０．０１），使果实受到不可逆抑制；果皮膜透性和丙二醛（ＭＤＡ）含量比对照明显增加（Ｐ＜ ０．０１），超氧物歧化酶（ＳＯＤ）活性成倍提高，并出现新的ＳＯＤ同工酶带。贮藏效果表明：合理的ＳＯ２ 处理能够延缓果实的衰老进程。

The effects ofsulphur dioxide (SO2)treatm ent on the oxidation and senescence of lon- gan fruits (Dim ocarpus longan Lour.cv.Shixia) stored at 4 ℃w ere studied.The results indicated that com pared w ith the control,the respiration rate of longan fruitfum igated w ith SO2 w as obvi- ously reduced(P< 0.01) and inhibited irreversibly;the m em brane perm eability and m alonaldehyde (MDA) content ofthe pericarp oflongan fruit w ere obviously increased (P< 0.01).The increase of superoxide dism utase(SOD) activity and appearance of som e new SOD isoenzym e bands en- hanced the antioxide ability offruit.The storage effects show ed thatappropriate SO2 treatm entde- layed the senescence and prolonged the storage life oflongan fruit.