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

doi:10.1093/hr/uhae184

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	SlTrxh functions downstream of SlMYB86 and positively regulates nitrate stress tolerance via S-nitrosation in tomato seedling
	Zeng, Senlin; Sun, Xudong; Zhai, Jiali; Li, Xixian; Pedro, Garcia-Caparros; Nian, Hongjuan; Li, Kunzhi; Xu, Huini
	2024
发表期刊	HORTICULTURE RESEARCH
ISSN	2662-6810
卷号	11 期号:9 页码:uhae184
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.
DOI	10.1093/hr/uhae184
WOS记录号	WOS:001304271100004
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/75951
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Zeng, Senlin,Sun, Xudong,Zhai, Jiali,et al. SlTrxh functions downstream of SlMYB86 and positively regulates nitrate stress tolerance via S-nitrosation in tomato seedling[J]. HORTICULTURE RESEARCH,2024,11(9):uhae184.
APA	Zeng, Senlin.,Sun, Xudong.,Zhai, Jiali.,Li, Xixian.,Pedro, Garcia-Caparros.,...&Xu, Huini.(2024).SlTrxh functions downstream of SlMYB86 and positively regulates nitrate stress tolerance via S-nitrosation in tomato seedling.HORTICULTURE RESEARCH,11(9),uhae184.
MLA	Zeng, Senlin,et al."SlTrxh functions downstream of SlMYB86 and positively regulates nitrate stress tolerance via S-nitrosation in tomato seedling".HORTICULTURE RESEARCH 11.9(2024):uhae184.

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