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However, whether GSNOR is involved in BR\u2010regulated Na<jats:sup>+<\/jats:sup>\/K<jats:sup>+<\/jats:sup> homeostasis to improve the salt tolerance in halophyte is unknown. Here, we firstly reported that high salinity increases the expression of BR\u2010biosynthesis genes and the endogenous levels of BR in mangrove <jats:italic>Kandelia obovata<\/jats:italic>. Then, salt\u2010induced BR triggers the activities and gene expressions of GSNOR and antioxidant enzymes, thereafter decrease the levels of malondialdehyde, hydrogen peroxide. Subsequently, BR\u2010mediated GSNOR negatively regulates NO contributions to the reduction of reactive oxygen species generation and induction of the gene expression related to Na<jats:sup>+<\/jats:sup> and K<jats:sup>+<\/jats:sup> transport, leading to the decrease of Na<jats:sup>+<\/jats:sup>\/K<jats:sup>+<\/jats:sup> ratio in the roots of <jats:italic>K. obovata<\/jats:italic>. Finally, the applications of exogenous BR, NO scavenger, BR biosynthetic inhibitor and GSNOR inhibitor further confirm the function of BR. Taken together, our result provides insight into the mechanism of BR in the response of mangrove <jats:italic>K. obovata<\/jats:italic> to high salinity via GSNOR and NO signaling pathway by reducing oxidative damage and modulating Na<jats:sup>+<\/jats:sup>\/K<jats:sup>+<\/jats:sup> homeostasis.<\/jats:p>","DOI":"10.1111\/pce.14745","type":"journal-article","created":{"date-parts":[[2023,10,23]],"date-time":"2023-10-23T08:24:37Z","timestamp":1698049477000},"page":"511-526","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Brassinosteroid enhances salt tolerance via <i>S<\/i>\u2010nitrosoglutathione reductase and nitric oxide signaling pathway in mangrove <i>Kandelia obovata<\/i>"],"prefix":"10.1111","volume":"47","author":[{"given":"Lin\u2010Lan","family":"Zeng","sequence":"first","affiliation":[{"name":"Key Laboratory for Subtropical Wetland Ecosystem Research of MOE, College of the Environment and Ecology Xiamen 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