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  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

Hummel, I., Pantin, F., Sulpice, R., Piques, M., Rolland, G., Dauzat, M., et al. (2010). 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. Plant Physiology, 154(1), 357-372. doi:10.1104/pp.110.157008.

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 Creators:
Hummel, I.1, Author
Pantin, F.1, Author
Sulpice, R.2, Author              
Piques, M.2, Author              
Rolland, G.1, Author
Dauzat, M.1, Author
Christophe, A.1, Author
Pervent, M.1, Author
Bouteille, M.1, Author
Stitt, M.2, Author              
Gibon, Y.2, Author              
Muller, B.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2System Regulation, Department Stitt, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753327              

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Free keywords: nitrate reductase-activity high-salinity stresses drought-stress maize leaves leaf growth carbohydrate-metabolism stomatal conductance osmotic adjustment starchless mutant transcript levels
 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.

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Language(s): eng - English
 Dates: 2010-07-162010
 Publication Status: Published in print
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 Identifiers: ISI: ISI:000281570000029
DOI: 10.1104/pp.110.157008
ISSN: 1532-2548 (Electronic) 0032-0889 (Linking)
URI: ://000281570000029 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2938159/pdf/357.pdf?tool=pmcentrez
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Title: Plant Physiology
Source Genre: Journal
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Pages: - Volume / Issue: 154 (1) Sequence Number: - Start / End Page: 357 - 372 Identifier: -