Nucleo-plastidic PAP8/pTAC6 couples chloroplast formation with photomorphogenesis

ABSTRACT: The initial greening of angiosperms involves light activation of photoreceptors that trigger photomorphogenesis, followed by the development of chloroplasts. In these semi-autonomous organelles, construction of the photosynthetic apparatus depends on the coordination of nuclear and plastid gene expression. Here, we show that expression of PAP8, an essential subunit of the plastid-encoded RNA polymerase (PEP) in Arabidopsis thaliana, is under the control of a regulatory element recognized by the photomorphogenic factor HY5. PAP8 protein is localized and active in both plastids and the nucleus, and particularly required for the formation of late photobodies. In the pap8 albino mutant, phytochrome-mediated signalling is altered, degradation of the chloroplast development repressors PIF1/PIF3

SUBMITTER: Monique Liebers 

PROVIDER: S-SCDT-EMBOJ-2020-104941 | biostudies-other |

REPOSITORIES: biostudies-other