Required for proper chloroplast development (Ref.7, PubMed:24144791). Involved in the regulation of plastid gene expression probably through regulation of plastid-encoded polymerase (PEP) dependent chloroplast transcription (PubMed:24144791). Required for RNA editing of several chloroplastic transcripts, especially accD transcripts (PubMed:24144791, PubMed:26123918). Required for processing of the chloroplastic rpoA pre-mRNA (Ref.6, Ref.7). Required for the monocistronic rpoA transcript processing from the rpl23-rpl2-rps19-rpl22-rps3-rpl16-rpl14-rps8-rpl36-rps11-rpoA polycistron. Binds the intergenic sequence of rps11-rpoA for rpoA monocistronic RNA cleavage (Ref.7). Interacts with MORF8/RIP1, MORF2/RIP2 and MORF9/RIP9. Expressed specifically in aerial greening tissues, such as cotyledons, rosette leaves, cauline leaves, stems, sepals, stamens, carpels and siliques. Albino lethal phenotype with severe chloroplast development defects. Belongs to the PPR family. PCMP-A subfamily.