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Menu Logo Principal Bordeaux Sciences Agro Institut de la Science de la Vigne et du Vin Labex Cote

UMR 1065 Santé et Agroécologie du Vignoble

Chloé Delmas

Chloé Delmas
Chargée de recherche (janvier 2017)

tél : (33) 05 57 12 26 13
mel : chloe.delmas@bordeaux.inra.fr
site perso : https://sites.google.com/site/chloedelmas/

Sujet de recherche : Vineyard ecosystem vulnerability to pathogens and drought in the context of climate change (VIVALDI) 

  • collaborations : UMR EGFV (Nathalie Ollat et Gregory Gambetta), UMR BIOGECO (Sylvain Delzon), University of Tasmania (Tim Brodribb)
  • financement : LabEx COTE project

Objectif :

The impacts of abiotic and biotic stresses on agrosystems have been mainly considered separately despite global surveys of agrosystem vulnerability are a key step toward an accurate management of crop production in the context of climate change. Climate change and especially increased drought frequency and severity influences the extent of pathogen aggressiveness, plant physiology and their interaction. The general objective of the VIVALDI project is to study the global response of vineyard agrosystems (vulnerability and resilience) to biotic and abiotic stresses in the context of climate change. VIVALDI integrates:

  • a survey of grapevine responses to both pathogen exposure and drought stress: Xylem vulnerability to hydraulic failure, pathogen aggressiveness and joint signalling responses to drought and pathogens will be assessed on both sensitive and resistant grapevine genotypes;
  • a survey of the adaptive potential of pathogens to climate (varying temperature) and to host resistance and
  • a long-term monitoring of global responses of vineyard agrosystems to cultural practice modifications: xylem vulnerability to hydraulic failure, disease epidemiology, pathogen evolution and yield will be investigated in a system based on partially disease resistant varieties, a conventional system and an organic system (ResIntBio experimental vineyard).

Using an original and integrative study focusing on both plant crop physiological responses and pathogen adaptive capacities to climate change via the study of plant and pathogen life history traits, suitable grapevine cultivars will be identified to provide new opportunities for a durable viticulture in the context of climate change. 

Publications 

  • Delmas C.E.L., Dussert Y, Delière L, Couture C, Mazet ID, Richart Cervera S., Delmotte F.  (2017) Soft selective sweeps in fungicide resistance adaptation: recurrent mutations without fitness costs in grapevine downy mildew. Molecular Ecology, In press

  • Charrier G, Torres-Ruiz JM, Badel E, Burlett R, Choat B, Cochard H, Delmas C.E.L., Domec JC, Jansen S, King A, Lenoir N, Martin-StPaul N, Gambetta GA, Delzon S. (2016) Evidence for hydraulic vulnerability segmentation and lack of xylem refilling under tension. Plant Physiology, 172: 1657-1668

  • Delmas C.E.L., Fabre F., Jolivet J., Mazet I.D., Richart Cervera S., Delière L., Delmotte F. (2016) Adaptation of a plant pathogen to partial host resistance: selection for greater aggressiveness in grapevine downy mildew. Evolutionary Applications, 9 (5) 709-725
  • Delmas C.E.L., Escaravage N., Cheptou P-O, Charrier O., Ruzafa S., Winterton P. and Pornon A. (2015) Relative impact of mate versus pollinator availability on pollen limitation and outcrosing rates in a mass-flowering species. Plant Biology, 17: 209-218.
  • Delmas C.E.L.,  Cheptou P-O, Escaravage N. and Pornon A. (2014) High lifetime inbreeding depression counteracts the reproductive assurance benefit of selfing in a mass-flowering shrub. BMC Evolutionary Biology, 14 : 243.
  • Delmas C.E.L., Mazet I.D., Jolivet J., Delière L., Delmotte, F. (2014) Quantification of sporangia and zoospore production in a plant pathogen oomycete with an automatic particle analyser. Journal of Microbiological methods, 107: 169-175.
vivaldi

Projet précédent : Evolution des populations de pathogènes de la vigne face aux changements des pratiques viticoles

La mise en place de plans de gestion des maladies dans les vignobles (réduction des intrants, augmentation des surfaces bio, utilisation de variétés de vigne résistantes aux maladies) pourrait entraîner l'évolution des populations d’agents pathogènes. Bien que cela soit une étape indispensable à la mise en place de stratégies de protection des plantes efficaces et durables, il existe peu de travaux étudiant les capacités adaptatives des populations de pathogènes de plantes en milieu agricole. L'objectif de ce projet est d’évaluer l’impact de différentes pratiques viticoles sur l’évolution de l’agressivité de l'agent causal du mildiou de la vigne, Plamopara viticola.

Voir aussi

page web personnelle

Thématiques de recherche et compétences

  • Ecologie évolutive des interactions biotiques (plantes-pollinisateurs et plantes-pathogènes)
  • Biologie de la reproduction et de la pollinisation
  • Invasions biologiques
  • Méthodes: expérimentations de terrain / laboratoire; analyses génétiques (marqueurs neutres); méta-analyses

Formation

  • Doctorat en Ecologie, Biodiversité et Evolution (Janv. 2012) - Université Toulouse III Paul Sabatier, France - UMR 5174 CNRS/UPS Lab.  Évolution et Diversité Biologique
  • Master II en écologie végétale (2008) - Université Bordeaux I, France (stage de recherche à York University, Toronto, Canada)
  • Master I Systèmes Ecologiques (2007) - Université Bordeaux I, France

Publications 

  • Delmas C.E.L., Fort T.L.C. Escaravage N., Pornon A. (2016) Pollen transfer in fragmented plant populations: insight from the pollen loads of pollinators and stigmas in a mass-flowering species. Ecology and Evolution, in press.
  • Lens F., Picon-Cochard C., Delmas C.E.L., Signarbieux C., Buttler A., Cochard H., Jansen S., Chauvin T., Chacon Doria L., del Arco M., Delzon S. (2016) Herbaceous angiosperms are not more vulnerable to drought-induced embolism than angiosperm tree. Plant Physiology, http:/​/​dx.​doi.​org/​10.​1104/​pp.​16.​00829.
  • Delmas C.E.L., Fabre F., Jolivet J., Mazet I.D., Richart Cervera S., Delière L., Delmotte F. (2016) Adaptation of a plant pathogen to partial host resistance: selection for greater aggressiveness in grapevine downy mildew. Evolutionary Applications, 9 : 709-725
  • Delmas C.E.L., Escaravage N., Cheptou P-O, Charrier O., Ruzafa S., Winterton P. and Pornon A. (2015) Relative impact of mate versus pollinator availability on pollen limitation and outcrosing rates in a mass-flowering species. Plant Biology 17: 209-218.
  • Delmas C.E.L., Mazet I.D., Jolivet J., Delière L., Delmotte F. (2014) Simultaneous quantification of sporangia and zoospores in a biotrophic oomycete with an automatic particle analyzer: disentangling dispersal and infection potentials. Journal of Microbiological Methods 107: 169-175.
  • Delmas C.E.L., Cheptou P-O, Escaravage N.  and Pornon A. (2014) High lifetime inbreeding depression counteracts the reproductive assurance benefit of selfing in a mass-flowering shrub. BMC Evolutionary Biology 14:243.
  • Delmas C.E.L., Escaravage N., Pornon A. (2014) Massive floral display affects insect visits but not pollinator-mediated pollen transfer in Rhododendron ferrugineum. Plant Biology 16: 234-243.
  • Charrier O, Delmas C.E.L., Pornon A., Escaravage N. (2013) Development of 18 microsatellite markers in Rhododendron ferrugineum (Ericaceae) for investigating genetic structure at margins. Conservation Genetics Resources 5: 473-477.
  • Delmas C.E.L., Lhuillier E., Pornon A. Escaravage N. (2011) Isolation and characterization of microsatellite loci in Rhododendron ferrugineum (Ericaceae) using pyrosequencing technology. American Journal of Botany 98: e120-e122.
  • Delmas C.E.L., Delzon S. and Lortie C.J. (2011) A meta-analysis of the ecological significance of density in tree invasions. Community Ecology 12:171-178.
  • Gaudnik C., Corcket E., Clément B., Delmas C.E.L., Gombert-Courvoisier S., Muller S.,  Stevens C. J. and Alard D. (2011) Detecting the footprint of changing atmospheric nitrogen deposition on acid grasslands in the context of climate change. Global Change Biology 17: 3351-3365.