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Stylosanthes guianensis (stylo), a vital forage legume in the tropics, exhibits high tolerance to low P stress. While numerous phosphate (Pi) starvation response genes have been documented in stylo, its underlying regulatory mechanisms remain unclear. In this study, coordinated root morphological plasticity was observed in the response of P-tolerant stylo genotypes to P deficiency, achieved through enhanced root growth. SgPHR1 (Phosphate Starvation Response 1) was characterized as a Pi-starvation-induced MYB transcription factor localized to the nucleus. Transgenic studies revealed that SgPHR1 overexpression increased plant dry weight and Pi uptake, especially under low-P conditions, whereas SgPHR1 knockdown suppressed these traits in stylo, likely by modulating root growth. RNA-seq analysis identified many downstream targets of SgPHR1, including SgPAE1, which encodes a pectin acetylesterase. Biochemical analyses confirmed that SgPHR1 activated the transcription of SgPAE1 by directly binding to the P1BS cis-element in its promoter region. Furthermore, SgPAE1 overexpression enhanced low-P tolerance by promoting root growth and P accumulation, while its suppression impaired these adaptive responses. Further analysis demonstrated that SgPAE1 mediates pectin deacetylation, likely contributing to root cell wall modification. Notably, genes encoding cell wall-modifying enzymes were significantly enriched in roots of SgPAE1-overexpressing plants under P deficiency. Collectively, this study establishes the SgPHR1-SgPAE1 transcriptional module as a key regulatory framework for low-P adaptation in stylo, which is probably through linking Pi signaling to root cell wall remodeling, thereby optimizing root growth and Pi acquisition.<\/jats:p>","DOI":"10.1093\/plphys\/kiag676","type":"journal-article","created":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T11:47:41Z","timestamp":1789040861000},"source":"Crossref","is-referenced-by-count":0,"title":["SgPHR1-SgPAE1 module modulates root growth and increases low phosphorus tolerance in\n                    <i>Stylosanthes guianensis<\/i>"],"prefix":"10.1093","volume":"202","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-0963-1881","authenticated-orcid":false,"given":"Jifu","family":"Li","sequence":"first","affiliation":[{"name":"Tropical Crops Genetic Resources Institute & National Key Laboratory for Tropical Crop Breeding, Chinese Academy of Tropical Agricultural Sciences , No. 4 Xueyuan Road, 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58 Renmin Avenue, Haidian District, Haikou 570228 ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-8629-8317","authenticated-orcid":false,"given":"Hongming","family":"Zhou","sequence":"additional","affiliation":[{"name":"Tropical Crops Genetic Resources Institute & National Key Laboratory for Tropical Crop Breeding, Chinese Academy of Tropical Agricultural Sciences , No. 4 Xueyuan Road, Longhua District, Haikou\/Sanya 571101\/572024 ,","place":["China"]},{"name":"College of Tropical Agriculture and Forestry, Hainan University , No. 58 Renmin Avenue, Haidian District, Haikou 570228 ,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-1250-4990","authenticated-orcid":false,"given":"Ye","family":"Miao","sequence":"additional","affiliation":[{"name":"Tropical Crops Genetic Resources Institute & National Key Laboratory for Tropical Crop Breeding, Chinese Academy 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