Exogenous application of hydrogen sulfide donor sodium hydrosulfide enhanced multiple abiotic stress tolerance in bermudagrass (Cynodon dactylon (L). Pers.)

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• 作者：Haitao Shi ; Tiantian Ye ; Zhulong Chan
• 关键词：Hydrogen sulfide ; Bermudagrass ; Abiotic stress ; Reactive oxygen species ; Antioxidant ; Osmolyte
• 刊名：Plant Physiology and Biochemistry
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：71
• 期：Complete
• 页码：226-234
• 全文大小：3943 K

文摘

As a gaseous molecule, hydrogen sulfide (H₂S) has been recently found to be involved in plant responses to multiple abiotic stress. In this study, salt (150 and 300?mM NaCl), osmotic (15 % and 30 % PEG6000) and cold (4?¡ãC) stress treatments induced accumulation of endogenous H₂S level, indicating that H₂S might play a role in bermudagrass responses to salt, osmotic and cold stresses. Exogenous application of H₂S donor (sodium hydrosulfide, NaHS) conferred improved salt, osmotic and freezing stress tolerances in bermudagrass, which were evidenced by decreased electrolyte leakage and increased survival rate under stress conditions. Additionally, NaHS treatment alleviated the reactive oxygen species (ROS) burst and cell damage induced by abiotic stress, via modulating metabolisms of several antioxidant enzymes [catalase (CAT), peroxidase (POD) and GR (glutathione reductase)] and non-enzymatic glutathione antioxidant pool and redox state. Moreover, exogenous NaHS treatment led to accumulation of osmolytes (proline, sucrose and soluble total sugars) in stressed bermudagrass plants. Taken together, all these data indicated the protective roles of H₂S in bermudagrass responses to salt, osmotic and freezing stresses, via activation of the antioxidant response and osmolyte accumulation. These findings might be applicable to grass and crop engineering to improve abiotic stress tolerance.