Fig. 4 Pigment contents and antioxidant activity of S. cymosum after
7 days of exposure to different concentrations (10, 25, and 50 μM) of
copper (Cu), lead (Pb), or Cu+Pb. a Concentration of chlorophyll a
(μg g−1 FW). b Concentration of chlorophyll c (μg g−1 FW). c
Concentration of carotenoids (μg g−1 FW). d Concentration of phenolic
compounds (μg g−1 FW). e Concentration of DPPH radical-scavenging
capacity (inhibition %). Different lowercase letters represent significant
differences between the treatments, according to bifactorial ANOVA and
Tukey’s a posteriori test (p≤0.05). Data are means±SD (n=4)