title: A Potassium-Dependent Oxygen Sensing Pathway Regulates Plant Root Hydraulics.
abstract: Aerobic organisms survive low oxygen (O2) through activation of diverse molecular, metabolic, and physiological responses. In most plants, root water permeability (in other words, hydraulic conductivity, Lpr) is downregulated under O2 deficiency. Here, we used a quantitative genetics approach in Arabidopsis to clone Hydraulic Conductivity of Root 1 (HCR1), a Raf-like MAPKKK that negatively controls Lpr. HCR1 accumulates and is functional under combined O2 limitation and potassium (K(+)) sufficiency. HCR1 regulates Lpr and hypoxia responsive genes, through the control of RAP2.12, a key transcriptional regulator of the core anaerobic response. A substantial variation of HCR1 in regulating Lpr is observed at the Arabidopsis species level. Thus, by combinatorially integrating two soil signals, K(+) and O2 availability, HCR1 modulates the resilience of plants to multiple flooding scenarios.
authors.affiliation: Biochimie et Physiologie Moléculaire des Plantes, UMR5004, INRA/CNRS/Montpellier SupAgro/Université Montpellier, 34060 Montpellier, France.
authors.forename: Zaigham
authors.initials: Z
authors.lastname: Shahzad
authors.affiliation: Institut Jean-Pierre Bourgin, INRA/AgroParisTech/CNRS/Université Paris-Saclay, RD10, 78026 Versailles Cedex, France.
authors.forename: Matthieu
authors.initials: M
authors.lastname: Canut
authors.affiliation: Biochimie et Physiologie Moléculaire des Plantes, UMR5004, INRA/CNRS/Montpellier SupAgro/Université Montpellier, 34060 Montpellier, France.
authors.forename: Colette
authors.initials: C
authors.lastname: Tournaire-Roux
authors.affiliation: Biochimie et Physiologie Moléculaire des Plantes, UMR5004, INRA/CNRS/Montpellier SupAgro/Université Montpellier, 34060 Montpellier, France.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Martinière
authors.affiliation: Biochimie et Physiologie Moléculaire des Plantes, UMR5004, INRA/CNRS/Montpellier SupAgro/Université Montpellier, 34060 Montpellier, France.
authors.forename: Yann
authors.initials: Y
authors.lastname: Boursiac
authors.affiliation: Institut Jean-Pierre Bourgin, INRA/AgroParisTech/CNRS/Université Paris-Saclay, RD10, 78026 Versailles Cedex, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Loudet
authors.affiliation: Biochimie et Physiologie Moléculaire des Plantes, UMR5004, INRA/CNRS/Montpellier SupAgro/Université Montpellier, 34060 Montpellier, France. Electronic address: christophe.maurel@supagro.inra.fr.
authors.forename: Christophe
authors.initials: C
authors.lastname: Maurel
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins; D018506:Gene Expression Regulation, Plant; D020930:MAP Kinase Kinase Kinases / Q000235:genetics / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism*; D010539:Permeability; D018517:Plant Roots / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics; D014867:Water / Q000378:metabolism*
chemical_list: D029681:Arabidopsis Proteins; D004268:DNA-Binding Proteins; C569242:RAP2.12 protein, Arabidopsis; D014157:Transcription Factors; D014867:Water; D020930:MAP Kinase Kinase Kinases; D011188:Potassium; D010100:Oxygen
keywords: Raf-like MAPKKK; anaerobic response; environmental stress; ethylene responsive transcription factors; flooding tolerance; hypoxia; plant cell signaling; root water transport