{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,29]],"date-time":"2025-12-29T14:12:45Z","timestamp":1767017565436,"version":"3.48.0"},"reference-count":30,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T00:00:00Z","timestamp":1760227200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Plant Cell &amp;amp; Environment"],"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Root hairs enlarge root surface and facilitate plant exploration for edaphic resources, particularly under nutrient\u2010limiting conditions. While magnesium (Mg) deficiency is known to markedly stimulate root hair development, the underlying molecular mechanisms remain poorly characterised. Here, we elucidate the critical role of SHADE AVOIDANCE 4 (SAV4) in regulating Mg deficiency\u2010induced root hair elongation through modulating epidermal auxin level in\n                    <jats:italic>Arabidopsis<\/jats:italic>\n                    . Root hair elongation under Mg deficiency was significantly suppressed in\n                    <jats:italic>sav4<\/jats:italic>\n                    mutant, and\n                    <jats:italic>SAV4<\/jats:italic>\n                    epidermal\u2010specific expression partially rescued its root hair elongation defect. Further analysis revealed that SAV4 expression was upregulated in root tips under Mg deficiency. Attenuated root hair elongation in\n                    <jats:italic>sav4<\/jats:italic>\n                    mutants is explained by reduced basipetal auxin transport in the root epidermis, caused by an inability to maintain the abundance of the membrane\u2010localised auxin efflux carrier PIN2. The endocytosis of PIN2 is delayed in\n                    <jats:italic>Arabidopsis<\/jats:italic>\n                    roots under Mg deficiency, which is released in\n                    <jats:italic>sav4<\/jats:italic>\n                    mutant and thus impairs basipetal auxin transport. Our findings establish a molecular framework wherein SAV4\u2010mediated dynamics of PIN2 at the epidermal membrane under Mg deficiency ensures proper basipetal auxin transport, thereby facilitating root hair elongation.\n                  <\/jats:p>","DOI":"10.1111\/pce.70235","type":"journal-article","created":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T06:29:08Z","timestamp":1760336948000},"page":"478-488","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["SHADE AVOIDANCE 4 Regulates Magnesium Deficiency\u2010Induced Root Hair Development by Regulating Auxin Transport in\n                    <i>Arabidopsis<\/i>"],"prefix":"10.1111","volume":"49","author":[{"given":"Nan","family":"Sun","sequence":"first","affiliation":[{"name":"State Key Laboratory of Soil Pollution Control and Safety Zhejiang University Hangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhen","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Soil Pollution Control and Safety Zhejiang University Hangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peifan","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Soil Pollution Control and Safety Zhejiang University Hangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bidan","family":"Yin","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Soil Pollution Control and Safety Zhejiang University Hangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xianyong","family":"Lin","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Soil Pollution Control and Safety Zhejiang University Hangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1399-6591","authenticated-orcid":false,"given":"Chengliang","family":"Sun","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Soil Pollution Control and Safety Zhejiang University Hangzhou 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