Integration of Phot1, Phot2, and PhyB signalling in light-induced chloroplast movements.

ABSTRACT: In Arabidopsis thaliana, chloroplasts move towards the periclinal cell walls upon exposure to low blue light intensities and to anticlinal walls under high light. The regulation of these chloroplast movements involves members of both the phototropin and phytochrome families of photoreceptors. Examination of fluence-rate response dependencies in phot1 and phot2 mutants revealed that although both photoreceptors are capable of inducing chloroplast accumulation under low-light conditions, the signals from these photoreceptors appear to be antagonistic. Chloroplast movements in wild-type plants were intermediate between those of the single phot mutants, consistent with each operating through separate signalling cascades. Mutants in phot2 showed transient chloroplast avoidance responses upon ex

SUBMITTER: Luesse DR 

PROVIDER: S-EPMC2955749 | biostudies-literature | 2010 Oct

REPOSITORIES: biostudies-literature