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This mutant, identified through a screen for defects in LR development, has been designated <jats:italic>dlr1\u20101<\/jats:italic>. The <jats:italic>dlr1\u20101<\/jats:italic> mutant exhibits impaired LR emergence rather than defects in the LR primordium (LRP) formation, particularly under potassium (K<jats:sup>+<\/jats:sup>)\u2010deprivation conditions. This impairment likely stems from inhibited cell proliferation caused by the <jats:italic>dlr1\u20101<\/jats:italic> mutation. K<jats:sup>+<\/jats:sup> deprivation specifically leads to the accumulation of salicylic acid (SA) in the <jats:italic>dlr1\u20101<\/jats:italic> mutant, consistent with the upregulation of SA biosynthesis genes. Moreover, exogenous application of SA to wild\u2010type plants (B73) mimics the <jats:italic>dlr1\u20101<\/jats:italic> phenotype. Conversely, treatment of the <jats:italic>dlr1\u20101<\/jats:italic> mutant with 2\u2010aminoindane\u20102\u2010phosphonic acid, an SA biosynthesis inhibitor, partially restores LR emergence, indicating that elevated SA levels may be responsible for the mutant's developmental defects. MutMap analysis and allelism tests confirmed that the phenotypes of the <jats:italic>dlr1\u20101<\/jats:italic> mutant results from the loss of the Na<jats:sup>+<\/jats:sup>\/H<jats:sup>+<\/jats:sup> antiporter, ZmNHX7. Additionally, the application of NaCl exacerbates the <jats:italic>dlr1\u20101<\/jats:italic> mutant phenotype, suggesting that the root defects in <jats:italic>dlr1\u20101<\/jats:italic> mutant depend on ion homoeostasis. In conclusion, our findings demonstrate that maize DLR1\/NHX7 is essential for root development under potassium deprivation.<\/jats:p>","DOI":"10.1111\/pce.15246","type":"journal-article","created":{"date-parts":[[2024,10,24]],"date-time":"2024-10-24T05:04:32Z","timestamp":1729746272000},"page":"1329-1343","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Maize DLR1\/NHX7 Is Required for Root Development Under Potassium Deficiency"],"prefix":"10.1111","volume":"48","author":[{"given":"Kang","family":"Guo","sequence":"first","affiliation":[{"name":"The Zhongzhou Laboratory for Integrative Biology, State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences Henan University Kaifeng China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daojun","family":"Li","sequence":"additional","affiliation":[{"name":"The Zhongzhou Laboratory for Integrative Biology, State Key Laboratory 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