| ABA | abscisic acid |
| DEAD-box RHs | DEAD-box RNA helicases |
| mTERF | mitochondrial transcription termination factor |
| OGE | organellar gene expression |
| PPR | pentatricopeptide repeat proteins |
| PSRP2 | PLASTID-SPECIFIC RIBOSOMAL PROTEIN 2 |
| RRM | RNA-recognition motifs (RRMs) |
| SIG5 | SIGMA FACTOR 5 |