Regulator of the large subunit (LS) of RuBisCO. Involved either in the processing or in the stabilization of the processed transcript, probably by acting as a barrier to the 5'>3' degradation. Expressed in stems, leaves and sepals. No visible phenotype. RuBisCO content only slightly reduced. Belongs to the PPR family. P subfamily. Was originally thought to correspond to two different genes At4g34820 and At4g34830. Was originally thought to correspond to two different genes At4g34820 and At4g34830. Was originally thought to correspond to two different genes At4g34820 and At4g34830. Was originally thought to correspond to two different genes At4g34820 and At4g34830.