Fig. 3From: Physiological responses and algae inhibition of Pontederia cordata to simulated eutrophication and acid rain co-pollutionVariations in the Chl a (a), SOD (b), and CAT (c) of M. aeruginosa cells in various cultured water samples from P. cordata under compound stress for 1, 3, 5, and 7 d, respectively. Results are expressed as mean of triplicate samples ± standard error. Different lowercase letters indicate significant differences at P < 0.05Back to article page