Séminaire IBIP
Les séminaires ont lieu sur le Campus Montpellier SupAgro/INRA de La Gaillarde (2, place P. Viala Montpellier)

Jeudi 5 mars 2009
Salle 106 (Cœur d’Ecole) à 14h

Stress-induced reproduction

Robert Blanvillain
PGEC Berkeley

A functional screen in fission yeast identified plant cDNAs imparting higher tolerance to heavy metals and oxidative stress. Among these genes,OXIDATIVE STRESS 3 (OXS3) defines a novel family of proteins located indiscrete regions of the chromatin, whereas OXS2 is a nucleo-cytoplasmicshuttling transcription factor involved in stress-induced reproduction. OXS2 maintains vegetative growth, activates stress tolerance, or triggers stress-induced reproduction. In the absence of stress, OXS2 is cytoplasmic and is needed for vegetative growth; in its absence, the plant flowers early. Upon stress, OXS2 is nuclear and is needed for stress tolerance; in its absence, the plant is stress sensitive. OXS2 activates its own promoter and those of floral integrator genes, with direct binding to the promoter of SOC1. Stress-induced SOC1 expression and stress-induced flowering are impaired in mutants with defects in OXS2 and OXS2-like paralogs. The ability of OXS2 to autoactivate its own promoter may be an additional commensurate response to the stress intensity, which could lead from a strategy based on tolerating the effects of stress to one of escaping the stress via reproduction.

Contact : Grégory Vert

Contacts IBIP :
Sabine Zimmermann
Marc Lepetit
Corinne Dasen
Chantal Baracco