Physiological plasticity seems to be a central feature of CAM. The second group incorporates some information about C using the backscattering coefficient of particles b bp Behrenfeld et al. Lunde C. Quantum yields of photochemical reactions can be highly dependent on the structure, proximity and concentration of the reactive chromophores, the type of solvent environment as well as the wavelength of the incident light. In this respect, ordinary O 2 incubation methods, which are very useful for the assessment of photosynthetic production from light- and dark-incubation experiments [e.