Melatonin delays leaf senescence of postharvest Chinese flowering cabbage through ROS homeostasis
文献类型： 外文期刊
作者： Tan, Xiao-li 1 ; Zhao, Ya-ting 1 ; Shan, Wei 1 ; Kuang, Jian-fei 1 ; Lu, Wang-jin 1 ; Su, Xin-guo 3 ; Tao, Neng-guo 4 ; L 1 ;
作者机构： 1.South China Agr Univ, State Key Lab Conservat & Utilizat Subtrop Agrobi, Guangdong Prov Key Lab Postharvest Sci Fruits & V, Minist Educ,Coll Hort,Engn Res Ctr Southern Hort, Guangzhou 510642, Peoples R China
2.Lingnan Guangdong Lab Modern Agr, Guangzhou 510642, Peoples R China
3.Guangdong AIB Polytech, Guangzhou 510507, Peoples R China
4.Xiangtan Univ, Sch Chem Engn, Xiangtan 411105, Peoples R China
5.Southwest Univ, Coll Resources & Environm, Interdisciplinary Res Ctr Agr Green Dev Yangtze R, Chongqing 400715, Peoples R China
6.Guangxi Acad Agr Sci, Sugarcane Res Inst, Nanning 530007, Peoples R China
7.Univ Queensland, Queensland Alliance Agr & Food Innovat, St Lucia, Qld 4072, Australia
关键词： Chinese flowering cabbage; Leaf senescence; Melatonin; ROS homeostasis
期刊名称：FOOD RESEARCH INTERNATIONAL （ 影响因子：6.475； 五年影响因子：6.508 ）
ISSN： 0963-9969
年卷期： 2020 年 138 卷
页码：
收录情况： SCI
摘要： Reactive oxygen species (ROS) trigger and accelerate leaf senescence. Melatonin, a low molecular compound with several biological functions in plants, is known to delay leaf senescence in different species, including Chinese flowering cabbage. However, the mechanism(s) underpinning melatonin-delayed leaf senescence remains unclear. Here, we found that melatonin lowered the expression of chlorophyll catabolic genes (BrPAO and BrSGR1) and senescence-associated genes (BrSAG12 and BrSEN4), decreased chlorophyll loss, minimized the alteration in Fv/Fm ratio and remarkably delayed senescence of Chinese flowering cabbage after harvest. Moreover, the over-accumulation of O-2(center dot-), hydrogen peroxide (H2O2) and malondialdehyde contents and the expression of respiratory burst oxidase homologues (RBOH) genes (BrRbohB, BrRbohC, BrRbohD, BrRbohD2 and BrRbohE) were significantly inhibited by melatonin treatment. Melatonin-treated cabbages also showed higher O-2(center dot-), OH center dot and DPPH radical scavenging capacity and enhanced activities of peroxidase (POD), superoxide dismutase (SOD) and their gene expressions. Up-regulation of key components of ascorbate-glutathione (AsA-GSH) cycle, the metabolic pathway that detoxify H2O2, was also observed in melatonin-treated cabbages. These findings suggest that melatonin-delayed postharvest leaf senescence of postharvest Chinese flowering cabbage may be mediated, at least in part, by maintaining ROS homeostasis through restraining RBOHs-catalyzed ROS production and enhancing the activity of ROS-scavenging system including major antioxidant enzymes and AsA-GSH cycle.
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