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Laboratoire d'Océanographie Microbienne
UMR 7621

Séminaire Isabelle Carré

Isabelle CARRE (University of Warwick – UK) est présente au LOMIC dans le cadre d’Assemble (collaboration F-Y. Bouget), elle propose un exposé de ses travaux :
Circadian clocks and their contribution to environmental stress tolerance
Vendredi 25 avril à 11h00 en Amphithéâtre (Bat B)


Plants are unable to evade changes in their environment but are capable of adaptation. An endogenous 24-h biological clock, known as the circadian oscillator, enables plants to prepare themselves for predictable daily changes in light and temperature conditions. There is accumulating evidence that this circadian clock makes an important contribution to how plants cope with abiotic stresses such as drought or cold temperatures. The mechanisms by which the clock acts to mitigate the effects of these different environmental stresses is not known. We have recently uncovered a very high level of coupling between the clock and signaling pathways for the stress response hormone, abscisic acid (ABA). I will discuss current work, which aims to investigate the effect of this coupling on downstream ABA responses and to resistance to abiotic stress. Another project in my laboratory aims to investigate the role of the clock in controlling plant immunity. Plants also exhibit rhythmic changes in immunity against Botrytis and pseudomonas, suggesting that the clock acts to maximize plant resistance at times when infection is most likely to occur. In order to probe the mechanism of dawn-specific immunity, we are comparing the gene regulatory networks that are activated in response to infection at dawn and dusk. This research may in the future suggest novel strategies for crop improvement through modification of specific pathways downstream of the clock.


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