News from Apr 27, 2014
As a sigma factor, SIG5 controls expression of chloroplast genes, including the genes for the photoreaction center proteins D1 and D2. It own expression is under control of red and blue-light responsive photoreceptors and signals originating at the PQ-site of photosystem II.
For more details: Mellenthin et al. (2014) Plants 3, 359 - 391. Link