高压电场处理对贮藏番茄活性氧代谢的调节

为探讨高压电场调控采后果实成熟衰老的作用机理，研究了交变电场和稳恒电场处理对采后番茄活性氧代谢的影响。试验结果表明：交变电场处理可诱导贮藏前期番茄超氧化物歧化酶（SOD）和过氧化氢酶（CAT）活性，延缓贮藏后期SOD活性上升和CAT活性下降；稳恒电场处理对酶活性的诱导不显著。两种电场处理均延缓了过氧化物酶（POD）活性高峰出现的时间。稳恒电场处理果实整个贮藏过程中保持了高水平的抗坏血酸（AsA）以及还原型谷胱甘肽（GSH）含量。整个贮藏期间高压电场处理均显著抑制了番茄过氧化氢含量以及超氧阴离子的产生。

Regulation of high voltage electric field on metabolism of active oxygen species in tomato fruits during storage

In order to explore the regulatory mechanism of high voltage electric field (HVEF) on ripening and senescence of postharvest fruit, effects of steady electric field (SEF) or alternative electric field (AEF) treatment on metabolism of active oxygen species in harvested tomato fruits were studied. Results showed that AEF treatment could reduce SOD and CAT activities of tomato fruits on initial periods of storage, delay the increase of SOD activity and decrease of CAT activity on later periods of storage. However, SEF could not significantly increase the SOD or CAT activity. Both SEF or AEF treatments delayed the appearance of POD activity peak. Higher levels of AsA and GSH contents were observed in SEF-treated fruits than those in non-SEF and non-AEF treated fruits. During storage, high electric field treament significantly inhibited the production of H₂O₂ and O·₂- in tomato fruits.