Liste des publications scientifiques

Molecular analysis reveals high compartmentalization in aphid–primary parasitoid networks and low parasitoid sharing between crop and noncrop habitats

26/03/2014 00:00
Stephane A. P. Derocles, Anne Le Ralec, Mathilde M. Besson, Marion Maret, Alan Walton, Darren M. Evans and Manuel Plantegenest   Résumé: The ecosystem service of insect pest regulation by natural enemies, such as primary parasitoids, may be enhanced by the presence of uncultivated, semi-natural habitats within agro-ecosystems, although quantifying such host–parasitoid interactions is difficult. Here, we use rRNA 16S gene sequencing to assess both the level of parasitism by Aphidiinae...

E3 ubiquitin-ligases and their target proteins during the regulation of plant innate immunity

13/02/2014 00:00
Vincent Duplan and Susana Rivas   Résumé: Reversible protein ubiquitination plays a crucial role during the regulation of plant immune signaling. E3 ubiquitin (Ub)-ligase enzymes, which are classified into different families depending on their structural and functional features, confer the specificity of substrate and are the best characterized components of the ubiquitination cascade. E3 Ub-ligases of different families have been shown to be involved in all steps of plant immune...

Uptake of Water via Branches Helps Timberline Conifers Refill Embolized Xylem in Late Winter

12/02/2014 00:00
Stefan Mayr, Peter Schmid, Joan Laur, Sabine Rosner, Katline Charra-Vaskou, Birgit Dämon and Uwe G. Hacke   Résumé: Xylem embolism is a limiting factor for woody species worldwide. Conifers at the alpine timberline are exposed to drought and freeze-thaw stress during winter, which induce potentially lethal embolism. Previous studies indicated that timberline trees survive by xylem refilling. In this study on Picea abies, refilling was monitored during winter and spring seasons and analyzed...

CYCLOPS, A DNA-Binding Transcriptional Activator, Orchestrates Symbiotic Root Nodule Development

12/02/2014 00:00
Sylvia Singh, Katja Katzer, Jayne Lambert, Marion Cerri and Martin Parniske   Résumé: Nuclear calcium oscillations are a hallmark of symbiotically stimulated plant root cells. Activation of the central nuclear decoder, calcium- and calmodulin-dependent kinase (CCaMK), triggers the entire symbiotic program including root nodule organogenesis, but the mechanism of signal transduction by CCaMK was unknown. We show that CYCLOPS, a direct phosphorylation substrate of CCaMK,...

Expansion of banana (Musa acuminata) gene families involved in ethylene biosynthesis and signalling after lineage‐specific whole‐genome duplications

07/02/2014 00:00
Cyril Jourda, Céline Cardi, Didier MBéguié-A-Mbéguié, Stéphanie Bocs, Olivier Garsmeur, Angélique D'Hont, Nabila Yahiaoui   Résumé: Whole-genome duplications (WGDs) are widespread in plants, and three lineage-specific WGDs occurred in the banana (Musa acuminata) genome. Here, we analysed the impact of WGDs on the evolution of banana gene families involved in ethylene biosynthesis and signalling, a key pathway for banana fruit ripening. Banana ethylene pathway genes were...

The Brassicaceae-Specific EWR1 Gene Provides Resistance to Vascular Wilt Pathogens

05/02/2014 00:00
Koste A. Yadeta, Dirk-Jan Valkenburg, Mathieu Hanemian, Yves Marco and Bart P. H. J. Thomma   Résumé: Soil-borne vascular wilt diseases caused by Verticillium spp. are among the most destructive diseases worldwide in a wide range of plant species. The most effective means of controlling Verticillium wilt diseases is the use of genetic resistance. We have previously reported the identification of four activation-tagged Arabidopsis mutants which showed enhanced resistance to Verticillium...

Triterpene Biosynthesis in Plants

29/01/2014 00:00
Ramesha Thimmappa, Katrin Geisler, Thomas Louveau, Paul O'Maille, and Anne Osbourn   Résumé: The triterpenes are one of the most numerous and diverse groups of plant natural products. They are complex molecules that are, for the most part, beyond the reach of chemical synthesis. Simple triterpenes are components of surface waxes and specialized membranes and may potentially act as signaling molecules, whereas complex glycosylated triterpenes (saponins) provide protection against pathogens...

Nitric oxide-triggered remodeling of chloroplast bioenergetics and thylakoid proteins upon nitrogen starvation in Chlamydomonas reinhardtii

28/01/2014 00:00
Wei L, Derrien B, Gautier A, Houille-Vernes L, Boulouis A, Saint-Marcoux D, Malnoë A, Rappaport F, de Vitry C, Vallon O, Choquet Y, Wollman FA.   Résumé: Starving microalgae for nitrogen sources is commonly used as a biotechnological tool to boost storage of reduced carbon into starch granules or lipid droplets, but the accompanying changes in bioenergetics have been little studied so far. Here, we report that the selective depletion of Rubisco and cytochrome b6f complex that occurs when...

Thylakoid FtsH protease contributes to photosystem II and cytochrome b6f remodeling in Chlamydomonas reinhardtii under stress conditions

21/01/2014 00:00
Malnoë A, Wang F, Girard-Bascou J, Wollman FA, de Vitry C   Résumé: FtsH is the major thylakoid membrane protease found in organisms performing oxygenic photosynthesis. Here, we show that FtsH from Chlamydomonas reinhardtii forms heterooligomers comprising two subunits, FtsH1 and FtsH2. We characterized this protease using FtsH mutants that we identified through a genetic suppressor approach that restored phototrophic growth of mutants originally defective for cytochrome b6f accumulation....

The NF-YC1 interacting protein SIN1, a member of the GRAS family, is required for nodule organogenesis, infection thread progression and lateral root growth

14/01/2014 00:00
Marina Battaglia, Carolina Rípodas, Joaquín Clúa, Maël Baudin, O. Mario Aguilar, Andreas Niebel, María Eugenia Zanetti and Flavio Antonio Blanco   Résumé: A C subunit of the heterotrimeric nuclear factor Y (NF-YC1) was shown to play a key role in nodule organogenesis and bacterial infection during the nitrogen fixing symbiosis established between Phaseolus vulgaris (common bean) and Rhizobium etli. In order to identify other proteins involved in this process, we used the yeast two hybrid...
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