Species	Reference gene ID	Possible function	Papers / DOI
Arabidopsis	At3g53920	Sigma factors are initiation factors that promote the attachment of plastid-encoded RNA polymerase (PEP) to specific initiation sites and are then released.	Characterization of Arabidopsis plastid sigma-like transcription factors SIG1, SIG2 and SIG3.; 2003; DOI: 10.1023/a:1022095017355; PMID: 12602869; https://pubmed.ncbi.nlm.nih.gov/12602869/
Arabidopsis	At1g08540	Required for the transition of plastids into chloroplasts by coordinating nuclear and chloroplastic genomes under light conditions.	No verified direct reference in this release