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RBOH1-dependent apoplastic H2O2 mediates epigallocatechin-3-gallate-induced abiotic stress tolerance in Solanum lycopersicum L.

文献类型： 外文期刊

作者： Li, Xin 1 ; Li, Yang 1 ; Ahammed, Golam Jalal 4 ; Zhang, Xue-Ning 1 ; Ying, Le 5 ; Zhang, Lan 1 ; Yan, Peng 1 ; Zhang, Li 1 ;

作者机构： 1.Chinese Acad Agr Sci, Tea Res Inst, Minist Agr, Key Lab Tea Qual & Safety Control, Hangzhou 310008, Zhejiang, Peoples R China

2.Hebei Acad Agr & Forestry Sci, Inst Plant Protect, Key Lab Integrated Pest Management Crops Northern, Minist Agr, Baoding 071000, Peoples R China

3.Hebei Agr Univ, Coll Hort, Baoding 071000, Peoples R China

4.Henan Univ Sci & Technol, Coll Forestry, Luoyang 471023, Peoples R China

5.Hudson Inst Med Res, 27-31 Wright St, Clayton, Vic 3168, Australia

关键词： Abiotic stress; Epigallocatechin-3-gallate; Reactive oxygen species; Hydrogen peroxide; NADPH oxidase; RBOH1

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：5.545； 五年影响因子：5.99 ）

ISSN： 0098-8472

年卷期： 2019 年 161 卷

页码：

收录情况： SCI

摘要： Responses of plants to abiotic stimuli are mediated by a plethora of bioactive compounds. Flavonoids are a large group of plant secondary metabolites, playing diverse roles in plant growth, development and responses to stress. Despite the recent report on epigallocatechin-3-gallate (EGCG, a bioactive flavonoids)-induced enhanced tolerance to salt stress, the underlying molecular mechanisms of stress tolerance remain unclear. Moreover, whether such stress protective role of EGCG is common for other environmental stressors also remains elusive. In the current study, we showed that EGCG functions as a broad spectrum stress protectant that alleviates a variety of abiotic stresses such as cold, heat, salinity and drought in tomato plants. While those abiotic stresses inhibited leaf photosynthetic activity by enhancing reactive oxygen species (ROS) production and membrane damage, exogenous EGCG protected photosynthetic apparatus by reducing ROS accumulation. Furthermore, EGCG-induced attenuation of ROS accumulation was largely attributed to the enhanced activity of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX). Analysis of sub-cellular localization of ROS revealed that EGCG preferentially induced apoplastic H2O2 production by activation of RESPIRATORY BURST OXIDASE HOMOLOGI (RBOH1)-encoded NADPH oxidase. Further investigation using virus-induced gene silencing showed that suppression of RBOH1 expression aggravated abiotic stress-induced ROS accumulation and compromised EGCG-induced ROS scavenging, implying that RBOH1-dependent H2O2 production is critical for the EGCG-induced tolerance to abiotic stress. This study advances our current understanding of stress protective role of flavonoids and unveils a critical mechanism of EGCG-induced abiotic stress tolerance in tomato plants.

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