Physiological and biochemical effects of allelochemical ethyl 2-methyl acetoacetate (EMA) on cyanobacterium Microcystis aeruginosa

  • Hong Y
  • Hu H
  • Li F
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Abstract

The physiological and biochemical effects of an allelochemical ethyl 2-methyl acetoacetate (EMA) isolated from reed (Phragmites communis) on bloom-forming cyanobacterium, Microcystis aeruginosa, were investigated. EMA significantly inhibited the growth of M. aeruginosa in a concentration-dependent way. The metabolic indices (represented by esterase and total dehydrogenase activities), the cellular redox status (represented by the level of reactive oxygen species (ROS)), and the oxidative damage index (represented by the content of malondialdehyde (MDA), the product of membrane lipid peroxidation) were used to evaluate the physiological and biochemical changes in M. aeruginosa after EMA exposure. Esterase activity in M. aeruginosa did not change (P>0.05) after 2 h of exposure to EMA, but increased greatly after 24 and 48 h (P0.5 mg L-1) resulted in a remarkable loss of total dehydrogenase activity in M. aeruginosa after 4 h (P

Author-supplied keywords

  • Allelochemical
  • Ethyl 2-methyl acetoacetate (EMA)
  • Metabolic activity
  • Microcystis aeruginosa
  • Oxidative damage
  • Reactive oxygen species (ROS)
  • Water bloom

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