Abstract
Abstract Macrophyte Thalia dealbata roots aqueous extract was tested to study its allelopathic effects on Anabaena flos-aquae , Microcystis aeruginosa and natural phytoplankton assemblages. The biochemical changes of M. aeruginosa in response to the aqueous extract stress were explored. Our results demonstrated that the T. dealbata roots aqueous extract can significantly inhibit the growth of A. flos-aquae and M. aeruginosa . It also can induce a decrease in chlorophyll a content and an inhibition in total dehydrogenase activity of the phytoplankton assemblages. Biochemical changes in the stressed M. aeruginosa cells occurred. This includes an increase in the level of superoxide anion radical ( O 2 − ), malondialdehyde (MDA), and an increase in the activities of catalase (CAT) and glutathione peroxidase (GPX). The possible allelopathic mechanism of T. dealbata roots aqueous extract to M. aeruginosa might be connected with the excess O 2 − generation that aggravated lipid peroxidation of the cell membrane.
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