Gradual soil water depletion results in reversible changes of gene expression, protein profiles, ecophysiology and growth performance in populus euphratica, a poplar growing in arid regions
2007
Bogeat-Triboulot , Marie-Béatrice (INRA (France). UMR 1137 Ecologie et Ecophysiologie Forestières) | Brosché , Mikael (University of Helsinki(Finlande). Department of Biological and Environmental Sciences) | Renaut , Jenny (Centre de Recherche Public Gabriel Lippmann(Luxembourg). Cellule de Recherche en Environnement et Biotechnologies) | Jouve , Laurent (Centre de Recherche Public Gabriel Lippmann(Luxembourg). Cellule de Recherche en Environnement et Biotechnologies) | Le Thiec , Didier (INRA (France). UMR 1137 Ecologie et Ecophysiologie Forestières) | Fayyaz , Payam (University of Göttingen(Allemagne). Institut für Forstbotanik) | Vinocur , Basia (Hebrew University of Jerusalem(Israël). Faculty of Agricultural, Food and Environmental Quality Sciences, The Robert H. Smith Institute of Plant, Sciences and Genetics in Agriculture) | Witters , Erwin (Université d'Anvers(Belgique). Center for Proteome Analysis and Mass Spectrometry) | Laukens , Kris (Université d'Anvers(Belgique). Center for Proteome Analysis and Mass Spectrometry) | Teichmann , Thomas (University of Göttingen(Allemagne). Institut für Forstbotanik) | Altman , Arie (Hebrew University of Jerusalem(Israël). Faculty of Agricultural, Food and Environmental Quality Sciences, The Robert H. Smith Institute of Plant, Sciences and Genetics in Agriculture) | Hausman , Jean-François (Centre de Recherche Public Gabriel Lippmann(Luxembourg). Cellule de Recherche en Environnement et Biotechnologies) | Polle , Andrea (University of Göttingen(Allemagne). Institut für Forstbotanik) | Kangasjärvi , Jaakko (University of Helsinki(Finlande). Plant Biology, Department of Biological and Environmental Sciences) | Dreyer , Erwin (INRA (France). UMR 1137 Ecologie et Ecophysiologie Forestières)
The responses of Populus euphratica Oliv. plants to soil water deficit were assessed by analyzing gene expression, protein profiles, and several plant performance criteria to understand the acclimation of plants to soil water deficit. Young, vegetatively propagated plants originating from an arid, saline field site were submitted to a gradually increasing water deficit for 4 weeks in a greenhouse and were allowed to recover for 10 d after full reirrigation. Time-dependent changes and intensity of the perturbations induced in shoot and root growth, xylem anatomy, gas exchange, and water status were recorded. The expression profiles of approximately 6,340 genes and of proteins and metabolites (pigments, soluble carbohydrates, and oxidative compounds) were also recorded in mature leaves and in roots (gene expression only) at four stress levels and after recovery. Drought successively induced shoot growth cessation, stomatal closure, moderate increases in oxidative stressrelated compounds, loss of CO2 assimilation, and root growth reduction. These effects were almost fully reversible, indicating that acclimation was dominant over injury. The physiological responses were paralleled by fully reversible transcriptional changes, including only 1.5% of the genes on the array. Protein profiles displayed greater changes than transcript levels. Among the identified proteins for which expressed sequence tags were present on the array, no correlation was found between transcript and protein abundance. Acclimation to water deficit involves the regulation of different networks of genes in roots and shoots. Such diverse requirements for protecting and maintaining the function of different plant organs may render plant engineering or breeding toward improved drought tolerance more complex than previously anticipated
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