title: Connecting Homogalacturonan-Type Pectin Remodeling to Acid Growth.
abstract: According to the 'acid growth theory', cell wall acidification controls cell elongation, therefore plant growth. This notably involves changes in cell wall mechanics through modifications of cell wall polysaccharide structure. Recently, advances in cell biology showed that changes in cell elongation rate can be mediated by the remodeling of pectins, and in particular of homogalacturonans (HGs). Their demethylesterification appears to be a key element controlling the chemistry and the rheology of the cell wall. We postulate that precise and dynamic modulation of extracellular pH plays a central role in the control of HG-modifying enzyme activities, and in particular those of pectin methylesterases and polygalacturonases. We propose that acid growth requires dynamic HG remodeling through the tight control of cell wall pH.
authors.affiliation: EA3900 Biologie des Plantes et Innovation (BIOPI), Structure Féderative de Recherche (SFR) Condorcet Centre National de la Recherche Scientifique (CNRS) 3417, Université de Picardie, 33 Rue St Leu, 80039 Amiens, France.
authors.forename: Ludivine
authors.initials: L
authors.lastname: Hocq
authors.affiliation: EA3900 Biologie des Plantes et Innovation (BIOPI), Structure Féderative de Recherche (SFR) Condorcet Centre National de la Recherche Scientifique (CNRS) 3417, Université de Picardie, 33 Rue St Leu, 80039 Amiens, France. Electronic address: jerome.pelloux@u-picardie.fr.
authors.forename: Jérôme
authors.initials: J
authors.lastname: Pelloux
authors.affiliation: EA3900 Biologie des Plantes et Innovation (BIOPI), Structure Féderative de Recherche (SFR) Condorcet Centre National de la Recherche Scientifique (CNRS) 3417, Université de Picardie, 33 Rue St Leu, 80039 Amiens, France. Electronic address: valerie.lefebvre@u-picardie.fr.
authors.forename: Valérie
authors.initials: V
authors.lastname: Lefebvre
mesh_terms: D002265:Carboxylic Ester Hydrolases / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D010368:Pectins / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D010940:Plant Proteins; D010368:Pectins; D002265:Carboxylic Ester Hydrolases; C022323:pectinesterase; C003181:polygalacturonic acid
keywords: apoplast; growth; pH; pectin-remodeling enzymes; stiffness