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The Arabidopsis NRT1.1 transporter participates in the signaling pathway triggering root colonization of nitrate-rich patches Inra
Remans, T.; Nacry, P.; Pervent, M.; Filleur, S.; Diatloff, E.; Mounier, E.; Tillard, P.; Forde, B.G.; Gojon, A..
Localized proliferation of lateral roots in NO3--rich patches is a striking example of the nutrient-induced plasticity of root development. In Arabidopsis, NO3- stimulation of lateral root elongation is apparently under the control of a NO3--signaling pathway involving the ANR1 transcription factor. ANR1 is thought to transduce the NO3- signal internally, but the upstream NO3- sensing system is unknown. Here, we show that mutants of the NRT1.1 nitrate transporter display a strongly decreased root colonization of NO3--rich patches, resulting from reduced lateral root elongation. This phenotype is not due to lower specific NO3- uptake activity in the mutants and is not suppressed when the NO3--rich patch is supplemented with an alternative N source but is...
Tipo: Journal Article Palavras-chave: ADAPTATIVE ROOT DEVELOPMENT; ANR 1 SIGNALING PATHWAY; PLANT GROWTH; NITRATE SENSING; NITROGEN NUTRITION.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200774bfe224&uri=/notices/prodinra1/2007/04/
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