1. Surveillance of cell wall diffusion barrier integrity modulates water and solute transport in plants
- Author
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Ondřej Novák, Véronique Santoni, Rochus Franke, David E. Salt, Marie Barberon, Niko Geldner, Chloe Champeyroux, Monica Calvo-Polanco, Yann Boursiac, Christophe Maurel, Peng Wang, Karin Ljung, Guilhem Reyt, Institute of Biological and Environmental Sciences, University of Aberdeen, Biochimie et Physiologie Moléculaire des Plantes (BPMP), Université de Montpellier (UM)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS), Equipe Aquaporines (AQUA), Université de Montpellier (UM)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS), Department of Plant Molecular Biology, University of Lausanne, Department of Botany and Plant Biology, Inst Cellular & Mol Bot, University of Bonn, Umea Plant Science Center, Swedish University of Agricultural Sciences (SLU)-Department of Forest Genetics and Plant Physiology, Umea Plante Science Center, Department of Plant Molecular Biology, Institute of Biological and Environmental Sciences, School of Biological Sciences, University of Aberdeen, Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Umea Plant Science Center (UPSC), Department of Forest Genetics and Plant Physiology, and Swedish University of Agricultural Sciences (SLU)-Swedish University of Agricultural Sciences (SLU)
- Subjects
0301 basic medicine ,[SDV]Life Sciences [q-bio] ,Arabidopsis ,Aquaporin ,lcsh:Medicine ,stomate ,suberine ,Lignin ,Plant Roots ,Article ,Cell wall ,Diffusion ,03 medical and health sciences ,0302 clinical medicine ,Suberin ,Cell Wall ,absorption de l'eau ,[SDV.BV]Life Sciences [q-bio]/Vegetal Biology ,lcsh:Science ,Vegetal Biology ,Multidisciplinary ,Chemistry ,lcsh:R ,Water ,food and beverages ,régulation stomatique ,Biological Transport ,lignine ,Lipids ,Apoplast ,endoderme ,absorption racinaire ,030104 developmental biology ,Membrane ,Clean Water and Sanitation ,Stele ,Biophysics ,lcsh:Q ,Endodermis ,Casparian strip ,Biologie végétale ,030217 neurology & neurosurgery - Abstract
The endodermis is a key cell layer in plant roots that contributes to the controlled uptake of water and mineral nutrients into plants. In order to provide such functionality the endodermal cell wall has specific chemical modifications consisting of lignin bands (Casparian strips) that encircle each cell, and deposition of a waxy-like substance (suberin) between the wall and the plasma membrane. These two extracellular deposits provide control of diffusion enabling the endodermis to direct the movement of water and solutes into and out of the vascular system in roots. Loss of integrity of the Casparian strip-based apoplastic barrier is sensed by the leakage of a small peptide from the stele into the cortex. Here, we report that such sensing of barrier integrity leads to the rebalancing of water and mineral nutrient uptake, compensating for breakage of Casparian strips. This rebalancing involves both a reduction in root hydraulic conductivity driven by deactivation of aquaporins, and downstream limitation of ion leakage through deposition of suberin. These responses in the root are also coupled to a reduction in water demand in the shoot mediated by ABA-dependent stomatal closure.
- Published
- 2019
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