Involved in plastid rRNA processing and consequently in translation and early chloroplast differentiation (PubMed:12678554). Involved in organellar RNA editing. Required for the processing of multiple editing sites in plastids (PubMed:22411807, PubMed:23818871). Homodimer and heterodimer with MORF9 (PubMed:22411807, PubMed:25583991). Interacts with protoporphyrinogen oxidase 1 PPOX1 (PubMed:24497494). Heterodimers with MORF8/RIP1 and MORF9/RIP9 (PubMed:25583991). Interacts with PCMP-A2/PMD1 (PubMed:26123918). Interacts with ORRM1 (PubMed:25768119). Interacts with ORRM6 (PubMed:28213559). Small plants with white leaves that do not contain chlorophyll. Mutant plants are unable to grow autotrophically on soil and flowers are sterile. Belongs to the MORF family.