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Here, we examine the physiological and molecular responses of tomato (\n                    <jats:italic>Solanum lycopersicum<\/jats:italic>\n                    L.) to the combination of Pi, Zn and\/or Fe nutrient stresses during symbiosis with\n                    <jats:italic>Rhizophagus irregularis<\/jats:italic>\n                    , revealing the existence of a tripartite Pi\u2010Zn\u2010Fe cross\u2010talk in AM symbiosis. Interestingly, the mycorrhiza\u2010activated\n                    <jats:italic>SlPT3<\/jats:italic>\n                    , a member of the\n                    <jats:italic>PHOSPHATE TRANSPORTER 1<\/jats:italic>\n                    (\n                    <jats:italic>PHT1<\/jats:italic>\n                    ) gene family in tomato, is remarkably induced upon the simultaneous Pi and Zn deficiencies. Reverse genetics analysis revealed that SlPT3 not only contributes to Pi transport but is also essential for arbuscule development during Zn deficiency. Moreover, knockdown of\n                    <jats:italic>SlPT3<\/jats:italic>\n                    leads to reduced Fe accumulation and arbuscule degeneration in mycorrhizal roots by integration of Pi and Zn deficiencies.\n                    <jats:italic>In silico<\/jats:italic>\n                    analysis indicated that the SlPT3 and its homologs contain the IRT (Iron\u2010regulated transporter) domain across dicot and monocot species. Further heterogeneous expression of\n                    <jats:italic>SlPT3<\/jats:italic>\n                    in yeasts can restore the\n                    <jats:italic>\u0394pho84<\/jats:italic>\n                    defects in high\u2010affinity Pi uptake and regulate iron (Fe\n                    <jats:sup>+2<\/jats:sup>\n                    ) homeostasis in the\n                    <jats:italic>fet3fet4<\/jats:italic>\n                    mutant. Collectively, SlPT3 serves as a context\u2010dependent transporter that reshapes nutrient transport priorities in response to combined stresses, revealing a sophisticated mechanism for maintaining symbiosis under fluctuating soil nutrient conditions. These findings provide new avenues for exploring how arbuscular mycorrhizas integrate multiple nutrient stress signals into intricate plant development.\n                  <\/jats:p>","DOI":"10.1111\/tpj.70687","type":"journal-article","created":{"date-parts":[[2026,1,18]],"date-time":"2026-01-18T23:41:11Z","timestamp":1768779671000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["A mycorrhiza\u2010inducible phosphate transporter\n                    <scp>SlPT3<\/scp>\n                    regulates phosphate uptake, iron homeostasis, and arbuscule development in tomato under combined nutrient stress conditions"],"prefix":"10.1111","volume":"125","author":[{"given":"Xiaoning","family":"Fan","sequence":"first","affiliation":[{"name":"State Key Laboratory of Conservation and Utilization of Subtropical Agro\u2010Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Key Laboratory for Innovative 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Forest Plant Germplasm, College of Forestry and Landscape Architecture South China Agricultural University  Guangzhou 510642 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1926-7445","authenticated-orcid":false,"given":"Hongyun","family":"Xie","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Conservation and Utilization of Subtropical Agro\u2010Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture South China Agricultural University  Guangzhou 510642 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-3219-6685","authenticated-orcid":false,"given":"Yuemin","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Conservation and Utilization of Subtropical Agro\u2010Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture South China Agricultural University  Guangzhou 510642 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xianan","family":"Xie","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Conservation and Utilization of Subtropical Agro\u2010Bioresources, Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture South China Agricultural University  Guangzhou 510642 China"},{"name":"State Key Laboratory of Nutrient Use and Management Shandong Academy of Agricultural Sciences  Jinan 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