Integration of light and circadian signals that regulate chloroplast transcription by a nuclear-encoded sigma factor.

ABSTRACT: We investigated the signalling pathways that regulate chloroplast transcription in response to environmental signals. One mechanism controlling plastid transcription involves nuclear-encoded sigma subunits of plastid-encoded plastid RNA polymerase. Transcripts encoding the sigma factor SIG5 are regulated by light and the circadian clock. However, the extent to which a chloroplast target of SIG5 is regulated by light-induced changes in SIG5 expression is unknown. Moreover, the photoreceptor signalling pathways underlying the circadian regulation of chloroplast transcription by SIG5 are unidentified. We monitored the regulation of chloroplast transcription in photoreceptor and sigma factor mutants under controlled light regimes in Arabidopsis thaliana. We established that a chloroplast trans

SUBMITTER: Belbin FE 

PROVIDER: S-EPMC5215360 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature