The research on the effects of microcystins on aquatic plants has increased. Some aquatic plants have some tolerance to microcystins but the mechanism of the tolerance is still unknown. In this experiment, we used microcystins of different concentrations to study the toxic effect in Lemna minor and Myriophyllum spicatum. Experiments were carried out with a range of microcysitns levels (equivalent to 0, 0.1, 0.5, 1.0, and 4.3 mg/L). The growth of L. minor (as fresh weight) and chlorophyll a content were significantly reduced and superoxide dismu...
