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Glucose-6-phosphate dehydrogenase and alternative oxidase are involved in the cross tolerance of highland barley to salt stress and UV-B radiation

文献类型： 外文期刊

作者： Zhao, Chengzhou 1 ; Wang, Xiaomin 1 ; Wang, Xiaoyu 1 ; Wu, Kunlun 2 ; Li, Ping 1 ; Chang, Ning 1 ; Wang, Jianfeng 1 ; Wan 1 ;

作者机构： 1.Lanzhou Univ, Sch Life Sci, Minist Educ, Key Lab Cell Activ & Stress Adaptat, Lanzhou 730000, Peoples R China

2.Qinghai Acad Agr & Forest

关键词： Alternative pathway;Cross tolerance;Glucose-6-phosphate dehydrogenase;Highland barley;Oxidative stress

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：3.549； 五年影响因子：4.164 ）

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收录情况： SCI

摘要： In this study, a new mechanism involving glucose-6-phosphate dehydrogenase (G6PDH) and alternative pathways (AP) in salt pretreatment-induced tolerance of highland barley to UV-B radiation was investigated. When highland barley was exposed to UV-B radiation, the G6PDH activity decreased but the AP capacity increased. In contrast, under UV-B + NaC1 treatment, the G6PDH activity was restored to the control level and the maximal AP capacity and antioxidant enzyme activities were reached. Glucosamine (Glucm, an inhibitor of G6PDH) obviously inhibited the G6PDH activity in highland barley under UVB +NaC1 treatment and a similar pattern was observed in reduced glutathione (GSH) and ascorbic acid (Asc) contents. Similarly, salicylhydroxamic acid (SHAM, an inhibitor of AOX) significantly reduced the AP capacity in highland barley under UV-B +NaC1 treatment. The UV-B-induced hydrogen peroxide (H2O2) accumulation was also followed. Further studies indicated that non-functioning of G6PDH or AP under UV-B +NaC1+ Glucm or UV-B +NaC1+ SHAM treatment also caused damages in photosynthesis and stomatal movement. Western blot analysis confirmed that the alternative oxidase (AOX) and G6PDH were dependent each other in cross tolerance to UV-B and salt. The inhibition of AP or G6PDH activity resulted in a significant accumulation or reduction of NADPH content, respectively, under UV-B + NaC1 treatment in highland barley leaves. Taken together, our results indicate that AP and G6PDH mutually regulate and maintain photosynthesis and stomata movement in the cross adaptation of highland barley seedlings to UV-B and salt by modulating redox homeostasis and NADPH content. (C) 2015 Elsevier GmbH. All rights reserved.

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