Exogenous GSH protects tomatoes against salt stress by modulating photosystem Ⅱ efficiency, absorbed light allocation and H2O2-scavenging system in chloroplasts

查看全文 作　　者：ZHOU [1,2]Yan;DIAO [1,2]Ming;CUI Jin-[1,2]xia;CHEN Xian-[1,2]jun;WEN Ze-[1,2]lin;ZHANG Jian-[1,2]wei;LIU Hui-[1,2]ying

机构地区：[1]Department of Horticulture, Agricultural College, Shihezi University, Shihezi 832003, P.R. China;[2]Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization of Xinjiang Production and Construction Crops, Shihezi 832003, P.R.China

出　　处：《Journal of Integrative Agriculture》索引2018年第17卷第10期,共16页

基　　金：funded by the National Natural Science Foundation of China (31360478);the International Cooperation Project of Xinjiang Production and Construction Corps, China (2014BC002) 摘　　要：The effects of exogenous GSH(reduced glutathione)on photosynthetic characteristics,photosystem Ⅱ efficiency,absorbed light energy allocation and the H_2O_2-scavenging system in chloroplasts of salt-stressed tomato(Solanum lycopersicum L.)seedlings were studied using hydroponic experiments in a greenhouse.Application of exogenous GSH ameliorated saline-induced growth inhibition,the disturbed balance of Na^+ and Cl^- ions and Na^+/K^+ ratios,and the reduction of the net photosynthetic rate(P_n).GSH also increased the maximal photochemical efficiency of PSⅡ(F_v/F_m),the electron transport rate(ETR),the photochemical quenching coefficient(q_P),and the non-photochemical quenching coefficient(NPQ).In addition,GSH application increased the photochemical quantum yield(Y(Ⅱ))and relative deviation from full balance between the photosystems(β/α–1)and decreased the PSⅡ excitation pressure(1–q_P)and quantum yield of non-regulated energy dissipation(Y(NO))in leaves of salt-stressed tomatoes without BSO(L-buthionine-sulfoximine,an inhibitor of key GSH synthesis enzymeγ-glutamylcysteine synthetase)or with BSO.Further,the addition of GSH depressed the accumulation of H_2O_2 and malondialdehyde(MDA),induced the redistribution of absorbed light energy in PSⅡ reaction centers,and improved the endogenous GSH content,GSH/GSSH ratio and activities of H_2O_2-scavenging enzymes(including superoxidase dismutase(SOD),catalase(CAT),peroxidase(POD)and key enzymes in the AsA-GSH cycle and Grx system)in the chloroplasts of salt-stressed plants with or without BSO.Therefore,GSH application alleviates inhibition of salt-induced growth and photosynthesis mainly by overcoming stomatal limitations,improving the PSⅡ efficiency,and balancing the uneven distribution of light energy to reduce the risk of ROS generation and to mediate chloroplast redox homeostasis and the antioxidant defense system to protect the chloroplasts from oxidative damage.Thus,GSH may be used as a potential tool for alleviating salt stress in tomato plants. 关键词：H2O2 光能分配 GSH 叶绿体西红柿清除吸收系统

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Exogenous GSH protects tomatoes against salt stress by modulating photosystem Ⅱ efficiency, absorbed light allocation and H2O2-scavenging system in chloroplasts

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