{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T02:35:01Z","timestamp":1790994901359,"version":"4.1.0"},"reference-count":80,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2021,12,23]],"date-time":"2021-12-23T00:00:00Z","timestamp":1640217600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Plant Sci."],"abstract":"<jats:p>\n                    Magnesium (Mg) deficiency is becoming a widespread limiting factor for crop production. How crops adapt to Mg limitation remains largely unclear at the molecular level. Using hydroponic-cultured tomato seedlings, we found that total Mg\n                    <jats:sup>2+<\/jats:sup>\n                    content significantly decreased by \u223c80% under Mg limitation while K\n                    <jats:sup>+<\/jats:sup>\n                    and Ca\n                    <jats:sup>2+<\/jats:sup>\n                    concentrations increased. Phylogenetic analysis suggested that Mg transporters (MRS2\/MGTs) constitute a previously uncharacterized 3-clade tree\n                    <jats:italic>in planta<\/jats:italic>\n                    with two rounds of asymmetric duplications, providing evolutionary evidence for further molecular investigation. In adaptation to internal Mg deficiency, the expression of six representative\n                    <jats:italic>MGT<\/jats:italic>\n                    s (two in the shoot and four in the root) was up-regulated in Mg-deficient plants. Contradictory to the transcriptional elevation of most of\n                    <jats:italic>MGT<\/jats:italic>\n                    s, Mg limitation resulted in the \u223c50% smaller root system. Auxin concentrations particularly decreased by \u223c23% in the Mg-deficient root, despite the enhanced accumulation of gibberellin, cytokinin, and ABA. In accordance with such auxin reduction was overall transcriptional down-regulation of thirteen genes controlling auxin biosynthesis (\n                    <jats:italic>TAR<\/jats:italic>\n                    \/\n                    <jats:italic>YUCs<\/jats:italic>\n                    ), transport (\n                    <jats:italic>LAXs, PINs<\/jats:italic>\n                    ), and signaling (\n                    <jats:italic>IAAs, ARFs<\/jats:italic>\n                    ). Together, systemic down-tuning of gene expression in the auxin signaling pathway under Mg limitation preconditions a smaller tomato root system, expectedly stimulating\n                    <jats:italic>MGT<\/jats:italic>\n                    transcription for Mg uptake or translocation.\n                  <\/jats:p>","DOI":"10.3389\/fpls.2021.802399","type":"journal-article","created":{"date-parts":[[2021,12,23]],"date-time":"2021-12-23T12:22:45Z","timestamp":1640262165000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":44,"title":["Magnesium Limitation Leads to Transcriptional Down-Tuning of Auxin Synthesis, Transport, and Signaling in the Tomato Root"],"prefix":"10.3389","volume":"12","author":[{"given":"Muhammad","family":"Ishfaq","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanting","family":"Zhong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yongqi","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xuexian","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2021,12,23]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","DOI":"10.3389\/fpls.2018.01367","article-title":"A larger root system is coupled with contrasting expression patterns of phosphate and nitrate transporters in foxtail millet [Setaria italica (L.) 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