Dynamic connectivity between neighbour cues perceived by photo-sensory receptors and hormone signalling networks.

CASAL, JORGE JOSÉ

Conferencia; First Plant Developmental Biology Meeting; 2017

NISER

Plants are exposed to fluctuating degrees of shade from neighbouring vegetation. These light cues are perceived by photo-sensory receptors that initiate growth and developmental responses to minimise the detrimental consequences of strong mutual shading. According to the current model, the molecular events mediating growth responses involve a reduction in the activity of the photo-sensory receptors (where phytochrome B plays a major role) and the subsequent enhancement of the binding of PHYTOCHROME INTERACTING FACTORs (PIFs) to the promoters of auxin synthesis genes, to increase auxin levels and the growth of selected organs. CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1) reinforces the action of PIFs by targeting to degradation some of its negative regulators. We will present results that expand this model to incorporate other points of action of phytochrome signalling on the hormonal network, including auxin, brassinosteroid and gibberellin pathways.