Two galactinol synthases contribute to the drought response of Camellia sinensis

Main conclusion CsGolS2-1 and CsGolS2-2 are involved in the transcriptional mechanism and play an important role in the drought response of tea plants. GolS is critical for the biosynthesis of galactinol and has been suggested to contribute to drought tolerance in various plants. However, whether Go...

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Bibliographic Details
Published in:Planta 2023-11, Vol.258 (5), p.84-84, Article 84
Main Authors: Xiao, Yezi, Dong, Yuan, Zhang, Yongheng, Zhang, Yingao, Liu, Lu, Liu, Peiying, Wan, Siqing, Xu, Qingshan, Yu, Youben
Format: Article
Language:English
Subjects:
Agriculture
Biomedical and Life Sciences
Biosynthesis
Cell membranes
Drought
Drought resistance
Ecology
Forestry
Life Sciences
Original Article
Plant Sciences
Tea
Transgenic plants
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Summary:Main conclusion CsGolS2-1 and CsGolS2-2 are involved in the transcriptional mechanism and play an important role in the drought response of tea plants. GolS is critical for the biosynthesis of galactinol and has been suggested to contribute to drought tolerance in various plants. However, whether GolS plays a role in drought response and the underlying transcriptional mechanism of GolS genes in response to drought stress in tea plants is still unclear. In this study, we found that drought stress promotes the accumulation of galactinol in tea leaves and that the expression of CsGolS2-1 and CsGolS2-2 , which encode proteins capable of catalyzing galactinol biosynthesis, is continuously and dramatically induced by drought stress. Moreover, transgenic Arabidopsis plants expressing CsGolS2-1 and CsGolS2-2 were more drought-tolerant than WT plants, as evidenced by increased cell membrane stability. In addition, the drought-responsive transcription factor CsWRKY2 has been shown to positively regulate the expression of CsGolS2-1 and CsGolS2-2 by directly binding to their promoters. Furthermore, CsVQ9 was found to interact with CsWRKY2 and promote its transcriptional function to activate CsGolS2-1 and CsGolS2-2 expression. Taken together, our findings provide insights not only into the positive role played by CsGolS2-1 and CsGolS2-2 in the drought response of tea plants but also into the transcriptional mechanisms involved.
ISSN:0032-0935
1432-2048
DOI:10.1007/s00425-023-04238-5