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Hydrogen sulfide delays leaf yellowing of stored water spinach (Ipomoea aquatica) during dark-induced senescence by delaying chlorophyll breakdown, maintaining energy status and increasing antioxidative capacity

文献类型： 外文期刊

作者： Hu, Huali 1 ; Liu, Dan 1 ; Li, Pengxia 2 ; Shen, Wenbiao 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Life Sci, Lab Ctr Life Sci, Nanjing 210095, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Agr Prod Proc, Nanjing 210014, Jiangsu, Peoples R China

关键词： Ipomoea aquatica;Hydrogen sulfide;Chlorophyll degradation;Energy status;Antioxidant capacity

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：5.537； 五年影响因子：5.821 ）

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收录情况： SCI

摘要： During dark-induced senescence at 12-14 degrees C, changes of endogenous hydrogen sulfide (H2S) metabolism, chlorophyll degradation, energy status, and antioxidant capacity of Ipomoea aquatica fumigated with or without exogenously applied H2S donor sodium hydrosulfide (NaHS) were assessed. Compared to the control, NaHS treatment brought about higher contents of endogenous H2S and chlorophyll, both of which were matched with increased activities of H2S synthetic enzymes and decreased activities of chlorophyll-degrading enzyme. Electron microscopy confirmed that the breakdown of chloroplasts was reduced by NaHS. H2S not only sustained the energy status, but also decreased the respiration rate and increased antioxidant capacity. The inhibition of H2S production caused by the application of its synthetic inhibitor (DL-propargylglucine) aggravated the yellowing of I. aquatica, and this response could be rescued by exogenously applied NaHS. Nevertheless, no obvious differences were observed between treatment of hypotaurine (a scavenger of H2S) and control. These results suggest that NaHS fumigation-induced endogenous H2S might improve the energy status, leading to enhancement of antioxidant capacity and inhibition of the respiration rate, and consequently, reducing the senescence of I. aquatica. (C) 2015 Elsevier B.V. All rights reserved.

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