An Organelle RNA Recognition Motif Protein Is Required for Photosystem II Subunit Transcript Editing.

Loss-of-function mutations in ORGANELLE RNA RECOGNITION MOTIF PROTEIN6 (ORRM6) result in the near absence of RNA editing of -C77 and the reduction in -C794 editing in Arabidopsis (). The mutants have decreased levels of photosystem II (PSII) proteins, especially PsbF, lower PSII activity, pale green pigmentation, smaller leaf and plant sizes, and retarded growth. Stable expression of rescues the editing defects and mutant phenotype.