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Published on November 10, 2006; 10.1104/pp.106.091355

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Received October 17, 2006
Accepted November 7, 2006

Genetic Variation Suggests an Interaction between Cold Acclimation and the Metabolic Regulation of Leaf Senescence

Céline Masclaux-Daubresse , Sarah Purdy , Thomas Lemaitre , Nathalie Pourtau , Ludivine Taconnat , Jean-Pierre Renou , and Astrid Wingler *

Unité de Nutrition Azotée des Plantes, UR511 INRA, F-78000 Versailles, France
Department of Biology, University College London, Gower Street, London WC1E 6BT, United Kingdom
Unité de Recherche en Génomique Végétale, INRA/CNRS/UEVE UR1165/Université d‘Evry Val d’Essonne, CP 5708, F-91057 Evry, France

* Corresponding author; email: a.wingler{at}ucl.ac.uk.

The extent to which leaf senescence is induced by nitrogen deficiency or by sugar accumulation varies between natural accessions of Arabidopsis (Arabidopsis thaliana). Analysis of senescence in plants of the Bay-0 x Shahdara recombinant-inbred line (RIL) population revealed a large variation in developmental senescence of the whole leaf rosette, which was in agreement with the extent to which glucose induced senescence in the different lines. To determine the regulatory basis of genetic differences in the glucose response, we investigated changes in gene expression using CATMA microarray analysis. Genes whose regulation did not depend on the genetic background as well as genes whose regulation was specific to individual RILs were identified. In RIL310, a line that does not show the typical senescence response to glucose, stress response genes, especially those responding to cold stress, were induced by glucose. We therefore tested if cold acclimation delays senescence by reducing sugar sensitivity. In cold-acclimated plants, leaf senescence was severely delayed and glucose did not induce the typical senescence response. Together, our results suggest that cold acclimation extends rosette longevity by affecting the metabolic regulation of senescence, thereby allowing e.g. vernalization-dependent plants to survive the winter period. The role of functional chloroplasts and of nitrogen and phosphate availability in this regulation is discussed.




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