Phytochrome and retrograde signalling pathways converge to antagonistically regulate a light-induced transcriptional network

Abstract

Retrograde signals from dysfunctional chloroplasts influence plant response to light. Here the authors show that the GUN1 retrograde signalling pathway acts antagonistically to the phytochrome-mediated red light perception pathway to control the expression of GLK1, a key transcriptional regulator of photomorphogenesis.