SlTrxh functions downstream of SlMYB86 and positively regulates nitrate stress tolerance via S-nitrosation in tomato seedling

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外文摘要：Nitric oxide(NO)is a redox-dependent signaling molecule that plays a crucial role in regulating a wide range of biological processes in plants.It functions by post-translationally modifying proteins,primarily through S-nitrosation.Thioredoxin(Trx),a small and ubiquitous protein with multifunctional properties,plays a pivotal role in the antioxidant defense system.However,the regulatory mechanism governing the response of tomato Trxh(SlTrxh)to excessive nitrate stress remains unknown.In this study,overexpression or silencing of SlTrxh in tomato led to increased or decreased nitrate stress tolerance,respectively.The overexpression of SlTrxh resulted in a reduction in levels of reactive oxygen species(ROS)and an increase in S-nitrosothiol(SNO)contents;conversely,silencing SlTrxh exhibited the opposite trend.The level of S-nitrosated SlTrxh was increased and decreased in SlTrxh overexpression and RNAi plants after nitrate treatment,respectively.SlTrxh was found to be susceptible to S-nitrosation both in vivo and in vitro,with Cysteine 54 potentially being the key site for S-nitrosation.Protein interaction assays revealed that SlTrxh physically interacts with SlGrx9,and this interaction is strengthened by S-nitrosation.Moreover,a combination of yeast one-hybrid(Y1H),electrophoretic mobility shift assay(EMSA),chromatin immunoprecipitation-quantitative PCR(ChIP-qPCR),and transient expression assays confirmed the direct binding of SlMYB86 to the SlTrxh promoter,thereby enhancing its expression.SlMYB86 is located in the nucleus and SlMYB86 overexpressed and knockout tomato lines showed enhanced and decreased nitrate stress tolerance,respectively.Our findings indicate that SlTrxh functions downstream of SlMYB86 and highlight the potential significance of S-nitrosation of SlTrxh in modulating its function under nitrate stress.

作者：

Senlin Zeng、Xudong Sun、Jiali Zhai、Xixian Li、García-Caparrós Pedro、Hongjuan Nian、Kunzhi Li、Huini Xu

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作者单位：

Faculty of Life Science and Technology,Kunming University of Science and Technology,Jingming South Street,Kunming,Yunnan 650224,China

Yunnan Key Laboratory of Crop Wild Relatives,The Germplasm Bank of Wild Species,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China

Department of Agronomy,University of Almeria,04120,Almeria,Spain

出版年：

2024

DOI：

10.1093/hr/uhae184

园艺研究(英文)

CSTPCD

ISSN：

年,卷(期)：2024.11(9)