Aguirrezabal

Armengaud

Bläsing

Bogeat-Triboulot

Boyer

Bray

Caspar

Chaves

Chia

Clifford

Corbesier

Cornic

Cramer

Cross

Cuming

Czechowski

Dudley

Farquhar

Flexas

Foyer

Fresneau

Gibon

Girousse

Granier

Hare

Hayashi

Huber

Jeannette

Kaiser

Kilian

Kreps

McCree

McDowell

McLaughlin

Miyashita

Morgan

Muller

Neumann Andersen

Newsholme

Nunes-Nesi

Osuna

Ozturk

Passioura

Pfaffl

Pinheiro

Piques

Plomion

Quan

Quick

Rabbani

Reymond

Riccardi

Romero

Sadok

Seki

Sharp

Strand

Sulpice

Tardieu

Troll

Tschoep

Usadel

Welcker

Widodo

Yang

Zrenner

Abstract
               Growth and carbon (C) fluxes are severely altered in plants exposed to soil water deficit. Correspondingly, it has been suggested that plants under water deficit suffer from C shortage. In this study, we test this hypothesis in Arabidopsis (Arabidopsis thaliana) by providing an overview of the responses of growth, C balance, metabolites, enzymes of the central metabolism, and a set of sugar-responsive genes to a sustained soil water deficit. The results show that under drought, rosette relative expansion rate is decreased more than photosynthesis, leading to a more positive C balance, while root growth is promoted. Several soluble metabolites accumulate in response to soil water deficit, with K+ and organic acids as the main contributors to osmotic adjustment. Osmotic adjustment costs only a small percentage of the daily photosynthetic C fixation. All C metabolites measured (not only starch and sugars but also organic acids and amino acids) show a diurnal turnover that often increased under water deficit, suggesting that these metabolites are readily available for being metabolized in situ or exported to roots. On the basis of 30 enzyme activities, no in-depth reprogramming of C metabolism was observed. Water deficit induces a shift of the expression level of a set of sugar-responsive genes that is indicative of increased, rather than decreased, C availability. These results converge to show that the differential impact of soil water deficit on photosynthesis and rosette expansion results in an increased availability of C for the roots, an increased turnover of C metabolites, and a low-cost C-based osmotic adjustment, and these responses are performed without major reformatting of the primary metabolism machinery.</jats:p

Irène Hummel

Florent Pantin

Ronan Sulpice

Maria Piques

Gaëlle Rolland

Myriam Dauzat

Angélique Christophe

Marjorie Pervent

Marie Bouteillé

Mark Stitt

Yves Gibon

Bertrand Muller

Crossref

Arabidopsis Plants Acclimate to Water Deficit at Low Cost through Changes of Carbon Usage: An Integrated Perspective Using Growth, Metabolite, Enzyme, and Gene Expression Analysis
 
 
 

http://www.plantphysiol.org/content/plantphysiol/154/1/357.full.pdf

Arabidopsis Plants Acclimate to Water Deficit at Low Cost through Changes of Carbon Usage: An Integrated Perspective Using Growth, Metabolite, Enzyme, and Gene Expression Analysis      

Arabidopsis Plants Acclimate to Water Deficit at Low Cost through Changes of Carbon Usage: An Integrated Perspective Using Growth, Metabolite, Enzyme, and Gene Expression Analysis

Abstract

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