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This work investigated the effect of H2S on cucumber growth, photosynthesis, antioxidation, ion balance, and other salt tolerance pathways. The plant height, stem diameter, leaf area and photosynthesis of cucumber seedlings were significantly inhibited by 50 mmol\u00b7L\u22121 NaCl. Moreover, NaCl treatment induced superoxide anion (O2\u00b7\u2212) and Na+ accumulation and affected the absorption of other mineral ions. On the contrary, exogenous spraying of 200 \u03bcmol\u00b7L\u22121 sodium hydrosulfide (NaHS) maintained the growth of cucumber seedlings, increased photosynthesis, enhanced the ascorbate\u2013glutathione cycle (AsA\u2013GSH), and promoted the absorption of mineral ions under salt stress. Meanwhile, NaHS upregulated SOS1, SOS2, SOS3, NHX1, and AKT1 genes to maintain Na+\/K+ balance and increased the relative expression of MAPK3, MAPK4, MAPK6, and MAPK9 genes to enhance salt tolerance. These positive effects of H2S could be reversed by 150 mmol\u00b7L\u22121 propargylglycine (PAG, a specific inhibitor of H2S biosynthesis). These results indicated that H2S could mitigate salt damage in cucumber, mainly by improving photosynthesis, enhancing the AsA\u2013GSH cycle, reducing the Na+\/K+ ratio, and inducing the SOS pathway and MAPK pathway.<\/jats:p>","DOI":"10.3390\/plants12132450","type":"journal-article","created":{"date-parts":[[2023,6,26]],"date-time":"2023-06-26T03:14:56Z","timestamp":1687749296000},"page":"2450","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Foliar Spraying of NaHS Alleviates Cucumber Salt Stress by Maintaining N+\/K+ Balance and Activating Salt Tolerance Signaling Pathways"],"prefix":"10.3390","volume":"12","author":[{"given":"Shilei","family":"Luo","sequence":"first","affiliation":[{"name":"College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zeci","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zilong","family":"Wan","sequence":"additional","affiliation":[{"name":"College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xianxia","family":"He","sequence":"additional","affiliation":[{"name":"College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jian","family":"Lv","sequence":"additional","affiliation":[{"name":"College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jihua","family":"Yu","sequence":"additional","affiliation":[{"name":"College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China"},{"name":"State Key Laboratory of Aridland Crop Science, Lanzhou 730070, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guobin","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,6,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1016\/j.plaphy.2021.07.023","article-title":"Hydrogen sulfide and nitric oxide are involved in melatonin-induced salt tolerance in cucumber","volume":"167","author":"Sun","year":"2021","journal-title":"Plant Physiol. 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