Nitric oxide is involved in melatonin-induced cold tolerance in postharvest litchi fruit
文献类型: 外文期刊
第一作者: Liu, Jialiang
作者: Liu, Jialiang;Zhang, Wanli;Pan, Yonggui;Zhang, Zhengke;Jiang, Yueming;Jiang, Guoxiang;Jiang, Yueming;Jiang, Guoxiang;Liu, Jialiang;Hu, Meijiao;Jiang, Guoxiang
作者机构:
关键词: Litchi; Chilling injury; Melatonin; Nitric oxide; Antioxidant activity; S-nitrosylation
期刊名称:POSTHARVEST BIOLOGY AND TECHNOLOGY ( 影响因子:7.0; 五年影响因子:6.9 )
ISSN: 0925-5214
年卷期: 2023 年 196 卷
页码:
收录情况: SCI
摘要: Previous studies indicate that melatonin, as an important bioactive molecule, appreciably improves cold toler-ance in postharvest litchi fruit. However, whether other signaling molecules are involved in melatonin-induced cold tolerance in litchi fruit has not been clarified. In this study, the effect of the interplay between melatonin and nitric oxide (NO) on chilling stress tolerance in relation to redox homeostasis in litchi fruit was investigated. In the first experiment, exogenous applications of melatonin and sodium nitroprusside (SNP) showed similar effi-cacy in decelerating the development of chilling injury (CI), as indicated by lower CI index and higher retention of pericarp redness in litchi fruit during refrigeration, whereas the opposite effect was found with NO scavenger 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO). The ameliorating effect of mela-tonin on CI was evidently impaired under cotreatment with melatonin and cPTIO (melatonin + cPTIO). In the second experiment, the biochemical response of litchi fruit to melatonin and melatonin + cPTIO during cold storage was analyzed. The results exhibited that melatonin triggered NO accumulation by activating nitrate reductase (NR) and nitric oxide synthase (NOS) in refrigerated litchi fruit. Melatonin-induced NO accumulation was reduced under treatment with melatonin + cPTIO, but this combined treatment did not affect the NR and NOS activities when compared to melatonin alone. Reactive oxygen species (ROS) in melatonin-treated fruit were markedly quenched by activating antioxidant enzymes and increasing antioxidant metabolite contents, thus alleviating membrane lipid peroxidation and maintaining membrane integrity. Melatonin also led to increased expression of oxidized protein repair-related genes, including LcMsrA1, LcMsrA2, LcMsrB1, LcMsB2, LcTrx2 and LcNTR1. Moreover, an enhanced level of protein S-nitrosylation was observed in fruit upon melatonin treatment. However, the above physiological effect associated with improved fruit cold tolerance afforded by melatonin was partially counteracted by cPTIO. The results suggest that endogenous NO could mediate melatonin-induced cold tolerance in litchi fruit via regulation of redox status.
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