CsGSTU8, a Glutathione S-Transferase From Camellia sinensis , Is Regulated by CsWRKY48 and Plays a Positive Role in Drought Tolerance

Glutathione S-transferases (GSTs) constitute a large family of enzymes with a wide range of cellular functions. Recently, plant GSTs have gained a great deal of attention due to their involvement in the detoxification of electrophilic xenobiotics and peroxides under adverse environmental conditions,...

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Published inFrontiers in plant science Vol. 12; p. 795919
Main Authors Zhang, Yongheng, He, Jingyuan, Xiao, Yezi, Zhang, Yingao, Liu, Yingqin, Wan, Siqing, Liu, Lu, Dong, Yuan, Liu, Huan, Yu, Youben
Format Journal Article
LanguageEnglish
Published Switzerland Frontiers Media S.A 09.12.2021
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Summary:Glutathione S-transferases (GSTs) constitute a large family of enzymes with a wide range of cellular functions. Recently, plant GSTs have gained a great deal of attention due to their involvement in the detoxification of electrophilic xenobiotics and peroxides under adverse environmental conditions, such as salt, cold, UV-B and drought stress. A previous study reported that a GST gene ( ) in tea plant was distinctly induced in response to drought, suggesting this gene plays a critical role in the drought stress response. In this study, by using quantitative real-time PCR (qRT-PCR) and β-glucuronidase (GUS) reporter lines, we further demonstrated that was upregulated in response to drought stress and exogenous abscisic acid (ABA) treatments. Overexpression of in resulted in enhanced drought tolerance as indicated by the improved scavenging of excess amounts of reactive oxygen species (ROS) under drought conditions. Furthermore, we found that CsWRKY48 acts as a transcriptional activator and that its expression is induced in response to drought stress and ABA treatment. Electrophoretic mobility shift assays (EMSAs), dual-luciferase (LUC) assays and transient expression assays in tea plant leaves revealed that CsWRKY48 directly binds to the W-box elements in the promoter of and activates its expression. Taken together, our results provide additional knowledge of drought stress responses in tea plant.
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Edited by: Rajeev K. Varshney, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), India
Reviewed by: Xinchao Wang, Tea Research Institute, Chinese Academy of Agricultural Sciences (CAAS), China; Huiying Li, Wuhan Botanical Garden, Innovative Academy of Seed Design (INASEED), Chinese Academy of Sciences (CAS), China
This article was submitted to Plant Abiotic Stress, a section of the journal Frontiers in Plant Science
ISSN:1664-462X
1664-462X
DOI:10.3389/fpls.2021.795919