Hypobaric Treatment Effects on Chilling Injury, Mitochondrial Dysfunction, and the Ascorbate–Glutathione (AsA-GSH) Cycle in Postharvest Peach Fruit

APX公司 谷胱甘肽 谷胱甘肽还原酶 化学 生物化学 谷胱甘肽过氧化物酶
作者
Lili Song,Jinhua Wang,Mohammad Shafi,Yuan Liu,Jie Wang,Jiasheng Wu,Aimin Wu
出处
期刊:Journal of Agricultural and Food Chemistry [American Chemical Society]
卷期号:64 (22): 4665-4674 被引量:65
标识
DOI:10.1021/acs.jafc.6b00623
摘要

In this study, hypobaric treatment effects were investigated on chilling injury, mitochondrial dysfunction, and the ascorbate-glutathione (AsA-GSH) cycle in peach fruit stored at 0 °C. Internal browning of peaches was dramatically reduced by applying 10-20 kPa pressure. Hypobaric treatment markedly inhibited membrane fluidity increase, whereas it kept mitochondrial permeability transition pore (MPTP) concentration and cytochrome C oxidase (CCO) and succinic dehydrogenase (SDH) activity relatively high in mitochondria. Similarly, 10-20 kPa pressure treatment reduced the level of decrease observed in AsA and GSH concentrations, while it enhanced ascorbate peroxidase (APX), glutathione reductase (GR), and monodehydroascorbate reductase (MDHAR) activities related to the AsA-GSH cycle. Furthermore, comparative transcriptomic analysis showed that differentially expressed genes (DEGs) associated with the metabolism of glutathione, ascorbate, and aldarate were up-regulated in peaches treated with 10-20 kPa for 30 days at 0 °C. Genes encoding GR, MDHAR, and APX were identified and exhibited higher expression in fruits treated with low pressure than in fruits treated with normal atmospheric pressure. Our findings indicate that the alleviation of chilling injury by hypobaric treatment was associated with preventing mitochondrial dysfunction and triggering the AsA-GSH cycle by the transcriptional up-regulation of related enzymes.
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