FIG. 2.

Upper panel shows photosystem gene cluster and protoporphyrin IX biosynthesis genes regulated by FnrL and AppA/PpsR. Each gene is represented by a box colored according to its function. bch genes, green; carotenoid crt genes, red; genes encoding structural polypeptides of photocomplexes, blue; genes encoding assembly factors or proteins of unknown function, gray; genes encoding regulatory factors, orange; genes encoding enzymes common to Bchl and ubiquinone biosynthesis, pink; protoporphyrin IX biosynthesis genes, magenta. Putative transcripts are shown as black horizontal arrows. Lower panels show relative expression levels at 7 and 30 min after exposure to H₂O₂ compared to no-stress conditions. Expression of every gene under the no-stress conditions is assigned 1 (not shown). Expression levels are according to the presented color scheme.