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Effects of Hg2+ on the chlorophyll a fluorescence parameters. (a) The minimal fluorescence (F0). (b) The maximum fluorescence (Fm). (c) The variable fluorescence Fv. (d) The maximal photochemical efficiency of PSII (Fv/Fm). Measurements were carried out after C. pyrenoidosa cells were exposed to various concentrations of Hg2+ for 24 h. Data are means ± S.E. (n = 3). Significant differences between different treatments were shown as different letters (p < 0.05, ANOVA, Duncan’s test).
