Regulates the RNA editing of the chloroplast transcript accD, and is essential for the early stages of chloroplast biogenesis (PubMed:20143129, PubMed:19500301, PubMed:21294841). Required for the RNA editing of the chloroplast transcript ndhF (PubMed:20143129, PubMed:21294841). Albino cotyledons without primary leaf and seedling lethality under autotrophic growth conditions. Belongs to the PPR family. PCMP-H subfamily.