草酸对冷藏期间桃果实抗氧化系统和PPO活性的影响

园艺学报 ›› 2005, Vol. 32 ›› Issue (5): 788-792.

草酸对冷藏期间桃果实抗氧化系统和PPO活性的影响

郑小林^{1, 2};田世平^1*;李博强¹;徐　勇¹

(¹中国科学院植物研究所光合作用与环境分子生理学重点实验室, 北京100093; ²湛江师范学院生物系, 湛江524048)

收稿日期:2004-11-17 修回日期:2005-03-07 出版日期:2005-10-25 发布日期:2005-10-25

Changes in Antioxidant Systems and Polyphenol Ox idase Activity in PeachFruit Treated with Exogenous Oxalic Acid during Storage at Low Temperature

Zheng Xiaolin;Tian Shiping;Li Boqiang;Xu Yong

(¹Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; ²Biology Department, Zhanjiang Normal University, Zhanjiang 524048, China)

Received:2004-11-17 Revised:2005-03-07 Online:2005-10-25 Published:2005-10-25

摘要/Abstract

摘要： 桃( Prunus persica L. ) 栽培品种‘八月脆’果实采后经5 mmol·L ^{- 1}草酸溶液浸泡10 min后在低温条件下贮藏, 与对照相比, 果实的CAT和PPO活性提高, SOD和POD活性在贮藏10 d后较高; 还原型抗坏血酸(AsA) 含量下降减缓; 超氧阴离子(O₂· ) 生成速率随贮藏增加, 过氧化氢(H₂O₂) 含量先升后降, 但经草酸处理后O₂·生成速率和H₂O₂含量分别在5 d和5、10 d时显著低于对照。说明草酸处理通过提高果实抗氧化防御系统的能力和PPO活性来延缓果实成熟和增强果实抗病能力。

关键词: 桃, 草酸, 低温, 抗氧化酶, 多酚氧化酶, 活性氧, 贮藏

Abstract: Peach ( Prunus persica L.‘Bayue Cui’) fruit were dipped in a 5 mmol·L ^{- 1} oxalic acid solution for 10 min and then stored at low temperature for 20 days. Changes in antioxidant ability and polyphenol oxidase ( POD) activity in the fruit were investigated during storage. The results showed that, as compared
with control fruit, higher activities of superoxide dismutase ( SOD) , peroxidaes ( POD) , catalase (CAT) and PPO were observed and lose of ascorbate acid (AsA) was delayed. Moreover, to some extent, active oxygen species (AOS) production including superoxide (O₂· ) and hydrogen peroxide (H₂O₂ ) was inhibited in treated fruit. Itwas suggested that effects of oxalic acid on increases of antioxidant ability and PPO activitymight be beneficial in delaying ripening process and enhancement of disease resistance in peach fruit during storage at low temperature.

Key words: Peach, Exogenous oxalic acid, Low temperature, Antioxidant enzyme, PPO, AOS, Storage

中图分类号:

S662.1

郑小林;;田世平;李博强;徐　勇. 草酸对冷藏期间桃果实抗氧化系统和PPO活性的影响[J]. 园艺学报, 2005, 32(5): 788-792.

Zheng Xiaolin;Tian Shiping;Li Boqiang;Xu Yong. Changes in Antioxidant Systems and Polyphenol Ox idase Activity in PeachFruit Treated with Exogenous Oxalic Acid during Storage at Low Temperature[J]. ACTA HORTICULTURAE SINICA, 2005, 32(5): 788-792.

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