Figure 7. Photo-physiological dark-light responses by in vivo chlorophyll a fluorescence kinetics (PAM).

A) Maximum quantum yield of charge separation in PSII (Φ_{PSII_max}), B) maximum light utilization coefficient (α), and C) maximum rETR after exposure to continuous white light (CWL), 48 h of darkness (D48) and 0.5, 6 and 24 h of re-exposure to white light after darkness (WL 0.5–24 h). Φ_{PSII_max} was measured subsequently to a 3 min dark acclimation period and is a measure of the maximum efficiency of photosynthetic electron yield per mol photons absorbed in PSII. Bars are S.D. (n = 3).