Fig. 5

PSI and PSII activity of S. alba leaves from control and Tl-treated plants. The photochemical and non-photochemical yields of PSI (a) and PSII (b) were measured in the steady state light conditions. Y(I) and Y(II) are photochemical yields of PSI and PSII respectively. Y(NA) and Y(YD) are the non-photochemical yields of PSI related to acceptor and donor side limitation respectively. Y(NPQ) and Y(NO) are non-photochemical yields of regulated and non-regulated energy dissipation processes in PSII respectively. Values are medians from three to ten replicates and whiskers show the range of the data. Values denoted by the same letter did not differ significantly at p = 0.05. Description of samples abbreviation as given in the legend to Fig. 3