HIGH NITROGEN INSENSITIVE 9 (HNI9)-mediated systemic repression of root NO3- uptake is associated with changes in histone methylation. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2011

HIGH NITROGEN INSENSITIVE 9 (HNI9)-mediated systemic repression of root NO3- uptake is associated with changes in histone methylation.

Résumé

In plants, root nitrate uptake systems are under systemic feedback repression by the N satiety of the whole organism, thus adjusting the N acquisition capacity to the N demand for growth; however, the underlying molecular mechanisms are largely unknown. We previously isolated the Arabidopsis high nitrogen-insensitive 9-1 (hni9-1) mutant, impaired in the systemic feedback repression of the root nitrate transporter NRT2.1 by high N supply. Here, we show that HNI9 encodes Arabidopsis INTERACT WITH SPT6 (AtIWS1), an evolutionary conserved component of the RNA polymerase II complex. HNI9/AtIWS1 acts in roots to repress NRT2.1 transcription in response to high N supply. At a genomic level, HNI9/AtIWS1 is shown to play a broader role in N signaling by regulating several hundred N-responsive genes in roots. Repression of NRT2.1 transcription by high N supply is associated with an HNI9/AtIWS1-dependent increase in histone H3 lysine 27 trimethylation at the NRT2.1 locus. Our findings highlight the hypothesis that posttranslational chromatin modifications control nutrient acquisition in plants.
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Dates et versions

hal-00623176 , version 1 (29-05-2020)

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Thomas Widiez, El Sayed El Kafafi, Thomas Girin, Alexandre Berr, Sandrine Ruffel, et al.. HIGH NITROGEN INSENSITIVE 9 (HNI9)-mediated systemic repression of root NO3- uptake is associated with changes in histone methylation.. Proceedings of the National Academy of Sciences of the United States of America, 2011, 108 (32), pp.13329-34. ⟨10.1073/pnas.1017863108⟩. ⟨hal-00623176⟩
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