4.8 Article

AtNIGT1/HRS1 integrates nitrate and phosphate signals at the Arabidopsis root tip

Journal

NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -

Publisher

NATURE RESEARCH
DOI: 10.1038/ncomms7274

Keywords

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Funding

  1. French Agence Nationale de la Recherche [ANR 11 PDOC 020 01]
  2. Centre National de la Recherche Scientifique
  3. NIH [R01-GM032877, NRSA-GM095273]
  4. NSF [MCB-0929338, DBI-0445666]
  5. National Science Foundation [MCB-0929338, IOS-1021380]

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Nitrogen and phosphorus are among the most widely used fertilizers worldwide. Nitrate (NO3-) and phosphate (PO43-) are also signalling molecules whose respective transduction pathways are being intensively studied. However, plants are continuously challenged with combined nutritional deficiencies, yet very little is known about how these signalling pathways are integrated. Here we report the identification of a highly NO3- - inducible NRT1.1- controlled GARP transcription factor, HRS1, document its genome-wide transcriptional targets, and validate its cis-regulatory elements. We demonstrate that this transcription factor and a close homologue repress the primary root growth in response to P deficiency conditions, but only when NO3- is present. This system defines a molecular logic gate integrating P and N signals. We propose that NO3- and P signalling converge via double transcriptional and post-transcriptional control of the same protein, HRS1.

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