Figure 3

Photosynthetic activities in leaves grown under control and Mn-toxic conditions. The maximum quantum yield of PSII (Fv/Fm) is shown in (a). (b,c) Show the total Chl and N concentrations in the leaves, respectively. The CO₂ assimilation rate (d), stomatal conductance (g_s) (e), and intercellular CO₂ concentration (f) are shown. For the PSII photosynthetic parameters, the quantum yields of PSII [Y(II)] (g), non-photochemical quenching [Y(NPQ)] (h), and non-radiative decay [Y(NO)] (i) are shown. For PSI photosynthetic parameters, the quantum yields of PSI [Y(I)] (j), non-photochemical quenching at the donor side [Y(ND)] (k), and non-photochemical quenching at the acceptor side [Y(NA)] (l) are shown. Data of photosynthetic parameters are shown as means with standard deviation (SD) (n = 7). The results for Fv/Fm (n = 7) and total Chl (n = 7) and N (n = 9) concentrations are shown as box plots. All data were obtained from independent biological replicates according to the indicated numbers. Black squares indicate the mean value, and bars indicate the range of the maximum or minimum data within a 1.5 × interquartile range (IQR). Asterisks show significant differences between the control and Mn-toxic conditions (*p < 0.05, **p < 0.01, Kruskal–Wallis test).