Binds to and supports processing of specific plastid RNAs. Associates via its C-terminal Rho-N domain to single stranded regions of 16S and 23S rRNAs or to rbcL mRNAs. May be involved in targeting transcripts to RNases such as RNE or RNase J. Homodimer or homomultimer. Part of a chloroplastic degradosome-like complex. Interacts with RNE. Smaller and albinotic phenotype. Increased number and decreased size of chloroplasts. Seedling lethal when homozygous. Truncated N-terminus.