Fig. 5.

Chlamydomonas cells do not use respiration to full capacity in the dark. Total nonpurgeable organic carbon (A) and starch content (B) of Chlamydomonas cells over the diurnal cycle. Data shown on a per cell basis. The green triangles indicate the timing of cell division. (C) Oxygen consumption (blue line) and respiration (resp) capacity of cells treated with the mitochondrial uncoupling agent FCCP (red line). Oxygen consumption was measured on the same samples before and after addition of FCCP. Data shown on a per cell basis. (D) Relative contribution of cytochrome c oxidase and alternative oxidases in oxygen consumption. Potassium cyanide (cyanide in figure) inhibits cytochrome c oxidase, while SHAM and propyl gallate target mitochondrial and plastid terminal oxidases (AOX and PTOX, respectively). Data shown on a per cell basis.