Liste des publications scientifiques

Genome-wide identification, phylogenetic analysis, expression profiling, and protein–protein interaction properties of TOPLESS gene family members in tomato

07/01/2014 00:00
Yanwei Hao, Xinyu Wang, Xian Li, Carole Bassa, Isabelle Mila, Corinne Audran, Elie Maza, Zhengguo Li, Mondher Bouzayen, Benoit van der Rest and Mohamed Zouine   Résumé: Members of the TOPLESS gene family emerged recently as key players in gene repression in several mechanisms, especially in auxin perception. The TOPLESS genes constitute, in ‘higher-plant’ genomes, a small multigenic family comprising four to 11 members. In this study, this family was investigated in tomato, a model plant...

The Saharan isolate Saccharothrix algeriensis NRRL B-24137 induces systemic resistance in Arabidopsis thaliana seedlings against Botrytis cinerea

01/01/2014 00:00
Saima Muzammil, Clotilde Graillon, Rayenne Saria, Florence Mathieu, Ahmed Lebrihi and Stéphane Compant   Résumé: Saccharothrix algeriensis NRRL B-24137, isolated from a Saharan soil, has been described as a potential biocontrol agent against Botrytis cinerea and other phytopathogens. However, the plant protection mechanisms involved still need to be described. The aim of this study was to determine this protection phenomenon as well as parts of the mechanisms involved, using Arabidopsis...

Protein Epistasis and the Biophysical Constraints on Catalytic Promiscuity

31/12/2013 00:00
C Crenshaw, J Aljadeff, I Fernandez, C Laurendon, M Defernez, HJ Koo, PE O'Maille, T Sharpee, JP Noel   Résumé: The limits of protein evolution are ultimately defined by biophysical constraints. Specifically, the maintenance of protein folding and stability is essential for the emergence novel enzyme function in the face of accumulating mutations. This fundamental requirement necessitates a viable mutational pathway towards beneficially altered function, but the frequency of such pathways...

ESCRT-I Mediates FLS2 Endosomal Sorting and Plant Immunity

26/12/2013 00:00
Thomas Spallek, Martina Beck, Sara Ben Khaled, Susanne Salomon, Gildas Bourdais, Swen Schellmann and Silke Robatzek   Résumé: The plant immune receptor FLAGELLIN SENSING 2 (FLS2) is present at the plasma membrane and is internalized following activation of its ligand flagellin (flg22). We show that ENDOSOMAL SORTING COMPLEX REQUIRED FOR TRANSPORT (ESCRT)-I subunits play roles in FLS2 endocytosis in Arabidopsis. VPS37-1 co-localizes with FLS2 at endosomes and immunoprecipitates with the...

Plant population differentiation and climate change: responses of grassland species along an elevational gradient

26/12/2013 00:00
Frei ER, Ghazoul J, Matter P, Heggli M, Pluess AR.   Résumé: Mountain ecosystems are particularly susceptible to climate change. Characterizing intraspecific variation of alpine plants along elevational gradients is crucial for estimating their vulnerability to predicted changes. Environmental conditions vary with elevation, which might influence plastic responses and affect selection pressures that lead to local adaptation. Thus, local adaptation and phenotypic plasticity among low and...

Geographic distance is more relevant than elevation to patterns of outbreeding in Ranunculus bulbosus

26/12/2013 00:00
Philippe Matter, Chris J. Kettle, Esther R. Frei, Jaboury Ghazou and Andrea R. Pluess   Résumé: Mountain ecosystems can exert different selection pressures on plant populations over small scales due to steep environmental gradients. Gene-flow between lower and higher elevation plant populations could lead to the increased integration of potentially adaptive genes and thereby to outbreeding vigour under current rapid climatic changes. Alternatively, gene-flow across elevation could...

Organisation et évolution de familles de gènes impliqués dans la maturation du fruit chez le bananier

19/12/2013 00:00
Cyril Jourda   Résumé: Les duplications totales du génome (WGD) sont répandues chez les plantes et l'analyse de la séquence du génome du bananier (Musa acuminata ssp. malaccensis, accession DH-Pahang) a identifié trois évènements de WGD chez cette espèce. Pour étudier l'impact de ces duplications sur l'évolution des familles de gènes chez le bananier, nous nous sommes focalisés sur les gènes impliqués dans deux voies biologiques importantes pour la maturation des fruits du bananier: la...

Emerging Functions of Nodulin-Like Proteins in Non-Nodulating Plant Species

10/12/2013 00:00
Nicolas Denancé, Boris Szurek, Laurent D Noël   Résumé: Plant genes whose expression is induced in legumes by Rhizobium bacteria upon nodulation were initially referred to as nodulins. Several of them play a key role in the establishment of symbiosis. Yet, nodulin-like proteins are also found in non-nodulating plant species such as Arabidopsis, rice, maize or poplar. For instance, 132 are predicted in the Arabidopsis thaliana Col-0 genome. Recent studies now highlight the importance of...

Two Evolutionarily Distinct Classes of Paleopolyploidy

01/12/2013 00:00
Olivier Garsmeur, James C Schnable, Ana Almeida, Cyril Jourda, Angélique D’Hont, Michael Freeling   Résumé: Whole genome duplications (WGDs) occurred in the distant evolutionary history of many lineages and are particularly frequent in the flowering plant lineages. Following paleopolyploidization in plants, most duplicated genes are deleted by intrachromosomal recombination, a process referred to as fractionation. In the examples studied so far, genes are disproportionately lost from one...

Characterization of the terpenoids composition of beers made with the French hop varieties: Strisselspalt, Aramis, Triskel and Bouclier

01/12/2013 00:00
Damien Steyer, Céline Clayeux and Bernadette Laugel   Résumé: Among the various compounds brought in to beer by hop, mono- and sesqui- terpenoids are the most studied and contribute to a certain extent to the hoppy aroma of beer. Previous studies have indicated that the concentration of these compounds in beer depends on the hop variety. The impact of new hop varieties created by the French hop growers association and their cooperative in comparison to the old variety Strisselspalt on the...
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