Séminaire de Richard BERTHOME


Le vendredi 12 mai 2017 à 13h00, salle de conférences de l'OSUR, bâtiment 14b, Campus de Beaulieu, UR1

Le vendredi 12 mai 2017 à 13h00, salle de conférences de l'OSUR, bâtiment 14b, Campus de Beaulieu, UR1

Plant response to biotic and abiotic stresses: Genetic bases underlying plant defence response to Ralstonia pseudosolanacearum in a global warming context

Abstract :

The scenarios related to the global warming, now widely accepted, predict an increase of the epidemics to which the crops will have to face [1, 2]. In addition, recent data indicated that the main resistance mechanisms to pathogens are inhibited by weak and permanent increase of temperature (3-5°C) [3-6]. In this context, significant yield losses are expected. The mechanisms involved in these inhibitions are still poorly understood and until now, no resistance mechanism remaining efficient under permanent temperature rises has been identified. Thus, the elucidation of such mechanisms is of major interest for global food security in the near future.
The Arabidopsis-interacting immune receptor pair, RPS4/RRS1-R directly intercepts the acetyltransferase activity of PopP2 type III effector [7]. This pair confers a broad spectrum resistance to Rasltonia [8] and can be transferred to crop species [9]. However, this immune response is inhibited at 30°C. We developed in our team a new project aimed i) to characterize mechanisms involved in the inhibition of this resistance, by studying the effect of a weak and permanent increase of temperature on plant perception/signalization components and bacterial virulence; ii) to identify Arabidopsis genes involved in resistance mechanisms remaining efficient at 30°C. Experimental design we have used as well as some mapping data will be presented.
1 Bergot et al. (2004). Global Change Biology 10: 1539-1552.
2 Evans et al. (2009). Journal of the Royal Society Interface 5: 525-531.
3 Cheng et al (2013). Nat Commun., 4:1-9.
4 Erickson et al (1999). Philos Trans R Soc Lond B Biol Sci., 354:653-658.
5 Jablonska et al (2007). Plant Physiol., 143: 1044-1054.
6 Mang et al (2012). Plant Cell, 24:1271-1284.
7 Le Roux et al. (2015). Cell, 161:1074-1088
8 Deslandes et al. (2002). Proc Natl Acad Sci U S A 99: 2404-2409.
9 Narusaka et al. (2013). PlOS one 8: e55954.

Contact : Richard BERTHOME