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To address this issue, rice seedlings were treated with MT, the NO donor sodium nitroprusside (SNP), or the NO scavenger c\u2010PTIO, alone or in combination, under Zn\u2010deficient conditions. Zn starvation rapidly promoted endogenous MT accumulation in rice roots, together with a 90.2%\u2013179.5% rise in the transcript levels of MT biosynthetic genes. Exposure to Zn deprivation reduced root\/shoot length and root\/shoot biomass, by 46.2%\/31.3% and 27.5%\/39.6%, respectively. Among the tested concentrations, 10\u2009\u03bcM MT produced the strongest protective effect, increasing root length, shoot height, root biomass, and shoot biomass by 59.9%, 34.2%, 21.7%, and 51.8%, respectively, relative to plants that were merely deficient in Zn. In Zn\u2010deficient plants, MT raised Zn concentration in root and shoot both by 16.2% and xylem sap Zn concentration by 15.6%. MT also increased root cell\u2010wall Zn content, pectin abundance, and pectin\u2010associated Zn by 20.0%, 39.3%, and 31.9%, respectively. At the expression level, MT moderated the induction of\n                    <jats:italic>OsZIP4<\/jats:italic>\n                    ,\n                    <jats:italic>OsZIP5<\/jats:italic>\n                    ,\n                    <jats:italic>OsZIP8<\/jats:italic>\n                    ,\n                    <jats:italic>OsZIP9<\/jats:italic>\n                    ,\n                    <jats:italic>OsZIP10<\/jats:italic>\n                    , and\n                    <jats:italic>OsHMA3<\/jats:italic>\n                    by Zn deficiency and further repressed\n                    <jats:italic>OsZIP1<\/jats:italic>\n                    , implying feedback regulation of the Zn\u2010homeostasis network instead of direct activation of Zn\u2010transporter transcription. Root NO content rose by 29.8% after MT treatment, and SNP elicited increases in root and shoot Zn concentrations comparable to those associated with MT. Overall, the data suggest that an NO\u2010associated response contributes to MT\u2010mediated Zn\u2010deficiency tolerance by restoring Zn homeostasis, promoting apoplastic Zn remobilization and root\u2010to\u2010shoot transport, and limiting oxidative damage.\n                  <\/jats:p>","DOI":"10.1111\/jpi.70191","type":"journal-article","created":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T09:07:28Z","timestamp":1791536848000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Melatonin Coordinates Root Cell\u2010Wall Zinc Remobilization and Shoot Transport via Nitric Oxide Signaling Under Zinc Deficiency in Rice"],"prefix":"10.1111","volume":"78","author":[{"given":"Jing","family":"Huang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science Chinese Academy of Science Nanjing China"},{"name":"University of Chinese Academy of 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