Liste des publications scientifiques

RD20, a Stress-Inducible Caleosin, Participates in Stomatal Control, Transpiration and Drought Tolerance in Arabidopsis thaliana

14/10/2010 00:00
Yann Aubert, Denis Vile, Marjorie Pervent, Didier Aldon, Benoit Ranty, Thierry Simonneau, Alain Vavasseur and Jean-Philippe Galaud   Résumé: Plants overcome water deficit conditions by combining molecular, biochemical and morphological changes. At the molecular level, many stress-responsive genes have been isolated, but knowledge of their physiological functions remains fragmentary. Here, we report data for RD20, a stress-inducible Arabidopsis gene that belongs to the caleosin family. As...

Light-regulated compensation of wat1 (walls are thin1) growth and secondary cell wall phenotypes is auxin-independent

01/10/2010 00:00
Nicolas Denancé, Philippe Ranocha, Yves Martinez, Björn Sundberg, Deborah Goffner   Résumé: We previously reported the characterization of walls are thin1 (wat1), an Arabidopsis mutant that exhibits two developmental phenotypes in stems: (1) a severe decrease in fiber secondary cell wall thickness and (2) a reduction in stem height. Auxin concentration and transport were also significantly reduced in the stem base of wat1 plants. In the original study, these characteristics were observed...

AtsPLA2-α nuclear relocalization by the Arabidopsis transcription factor AtMYB30 leads to repression of the plant defense response

24/08/2010 00:00
Solène Froidure, Joanne Canonne, Xavier Daniela, Alain Jauneau, Christian Brière, Dominique Roby, and Susana Rivas   Résumé: The hypersensitive response (HR), characterized by a rapid and localized cell death at the inoculation site, is one of the most efficient resistance reactions to pathogen attack in plants. The transcription factor AtMYB30 was identified as a positive regulator of the HR and resistance responses during interactions between Arabidopsis and bacteria. Here, we show that...

Interaction of a plant pseudo-response regulator with a calmodulin-like protein

06/08/2010 00:00
Alexandre Perochon, Stefan Dieterle, Cecile Pouzet, Didier Aldon, Jean-Philippe Galaud and Benoit Ranty   Résumé: Calmodulin (CaM) plays a crucial role in the regulation of diverse cellular processes by modulating the activities of numerous target proteins. Plants possess an extended CaM family including numerous CaM-like proteins (CMLs), most of which appear to be unique to plants. We previously demonstrated a role for CML9 in abiotic stress tolerance and seed germination in Arabidopsis...

Evolution and expression of class III peroxidases

01/08/2010 00:00
Catherine Mathé, Annick Barre, Cyril Jourda, Christophe Dunand   Résumé: Class III peroxidases are members of a large multigenic family, only detected in the plant kingdom and absent from green algae sensu stricto (chlorophyte algae or Chlorophyta). Their evolution is thought to be related to the emergence of the land plants. However class III peroxidases are present in a lower copy number in some basal Streptophytes (Charapyceae), which predate land colonization. Gene structures are...

Walls are thin 1 (WAT1), an Arabidopsis homolog of Medicago truncatula NODULIN21, is a tonoplast-localized protein required for secondary wall formation in fibers

20/05/2010 00:00
Philippe Ranocha, Nicolas Denancé, Ruben Vanholme, Amandine Freydier, Yves Martinez, Laurent Hoffmann, Lothar Köhler, Cécile Pouzet, Jean-Pierre Renou, Björn Sundberg, Wout Boerjan, Deborah Goffner   Résumé: By combining Zinnia elegans in vitro tracheary element genomics with reverse genetics in Arabidopsis, we have identified a new upstream component of secondary wall formation in xylary and interfascicular fibers. Walls are thin 1 (WAT1), an Arabidopsis thaliana homolog of Medicago...

Two EguCBF1 genes overexpressed in Eucalyptus display a different impact on stress tolerance and plant development

17/05/2010 00:00
Marie Navarro, Céline Ayax, Yves Martinez, Joan Laur, Walid El Kayal, Christiane Marque and Chantal Teulières   Résumé: Two C-repeat binding factor genes (EguCBF1a/b), isolated from E. gunnii and differentially cold-regulated, were constitutively overexpressed in a cold-sensitive Eucalyptus hybrid. In addition to the expected improvement on freezing tolerance, some resulting transgenic lines (EguCBF1a-OE and EguCBF1b-OE) exhibited a decrease in stomata density and an over-accumulation...

Reactive Oxygen Species during Plant-microorganism Early Interactions

10/02/2010 00:00
Amrit K. Nanda, Emilie Andrio, Daniel Marino, Nicolas Pauly and Christophe Dunand   Résumé: Reactive Oxygen Species (ROS) are continuously produced as a result of aerobic metabolism or in response to biotic and abiotic stresses. ROS are not only toxic by-products of aerobic metabolism, but are also signalling molecules involved in several developmental processes in all organisms. Previous studies have clearly shown that an oxidative burst often takes place at the site of attempted invasion...

Identification and regulation of the N-acetylglucosamine utilization pathway of the plant pathogenic bacterium Xanthomonas campestris pv. campestris

15/01/2010 00:00
Boulanger A, Déjean G, Lautier M, Glories M, Zischek C, Arlat M, Lauber E   Résumé: Xanthomonas campestris pv. campestris, the causal agent of black rot disease of brassicas, is known for its ability to catabolize a wide range of plant compounds. This ability is correlated with the presence of specific carbohydrate utilization loci containing TonB-dependent transporters (CUT loci) devoted to scavenging specific carbohydrates. In this study, we demonstrate that there is an X. campestris pv....

Discovery and Potential of SNP Markers in Characterization of Tunisian Olive Germplasm

30/12/2009 00:00
Imen Rekik Hakim, Naziha Grati Kammoun, Emna Makhloufi and Ahmed Rebaï   Résumé: Single Nucelotide Polymorphisms (SNPs) have become the most widely used markers in many current genetic applications. Here we report the discovery of nine new SNPs in olives by direct partial sequencing of two genes (OEX and OEW) in sixteen Tunisian cultivars. The SNP markers were then used to genotype 24 olive cultivars and assess the level of genetic diversity. Power of discrimination of SNP markers was then...
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