Aqueous extracts of three submerged macrophytes (Ceratophyllum demersum, Vallisneria spiralis and Hydrilla verticillata) and their ethyl acetate fractions were bioassayed using Microcystis aeruginosa. C. demersum showed stronger growth inhibition of M. aeruginosa than others. Ethyl acetate fraction contained succinic acid, azelaic acid, cis-aconitic acid, ferulic acid, 4-hydroxybenzoic acid, lactic acid and citric aicd. The potential allelopathic activities of these compounds on algal growth were discussed. Phenolic acid allelochemicals contributed more to the allelopathic effects of submerged macrophytes.
Allelochemicals, Ceratophyllum demersum, fatty acid, Hydrilla verticillata, Microcystis aeruginosa, phenolic acid, Vallisneria spiralis
