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In this study, we systematically examined the influence of light exposure on plastid RNA processing, focusing on RNA splicing and RNA editing. We demonstrated that light promotes the splicing of transcripts from the plastid genes <jats:italic>rps12<\/jats:italic>, <jats:italic>ndhA<\/jats:italic>, <jats:italic>atpF<\/jats:italic>, <jats:italic>petB<\/jats:italic>, and <jats:italic>rpl2<\/jats:italic>. Additionally, light increased the editing rate of the <jats:italic>accD<\/jats:italic> transcript at nucleotide 794 (<jats:italic>accD\u2010<\/jats:italic>794) and the <jats:italic>ndhF<\/jats:italic> transcript at nucleotide 290 (<jats:italic>ndhF<\/jats:italic>\u2010290), while decreasing the editing rate of the <jats:italic>clpP<\/jats:italic> transcript at nucleotide 559 (<jats:italic>clpP<\/jats:italic>\u2010559). We have identified key regulators of signaling pathways, such as CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1), ELONGATED HYPOCOTYL 5 (HY5), and PHYTOCHROME\u2010INTERACTING FACTORs (PIFs), as important players in the regulation of plastid RNA splicing and editing. Notably, COP1 was required for GENOMES UNCOUPLED1 (GUN1)\u2010dependent repression of <jats:italic>clpP<\/jats:italic>\u2010559 editing in the light. We showed that HY5 and PIF1 bind to the promoters of nuclear genes encoding plastid\u2010localized RNA processing factors in a light\u2010dependent manner. This study provides insight into the mechanisms underlying light\u2010mediated post\u2010transcriptional regulation of plastid gene expression.<\/jats:p>","DOI":"10.1111\/jipb.13779","type":"journal-article","created":{"date-parts":[[2024,10,1]],"date-time":"2024-10-01T14:10:09Z","timestamp":1727791809000},"page":"375-390","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Light signaling\u2010dependent regulation of plastid RNA processing in Arabidopsis"],"prefix":"10.1111","volume":"67","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-4081-6203","authenticated-orcid":false,"given":"Lili","family":"Hu","sequence":"first","affiliation":[{"name":"Institute of Medical Plant Physiology and Ecology, School of Pharmaceutical Sciences Guangzhou University of Chinese Medicine Guangzhou 510006 China"},{"name":"School of Life Sciences Sun Yat\u2010sen University Guangzhou 510275 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