The Algicidal Characteristics of One Algae-Lysing FDT5 Bacterium on Microcystis aeruginosa

Abstract

One strain of algicidal bacterium which can inhibit Harmful algal blooms (HABs), FDT5, was isolated from activated sludge and found to have good algicidal effects on Microcystis aeruginosa. It was revealed that: The FDT5 was a Gram-negative bacterium and identified as Ochrobactrum sp.; The greater the initial bacterial cell density, the faster the degradation of chlorophyll a.; The algicidal efficiency was evaluated at the most favorable conditions which were a temperature of 30–35°C, a pH of 7.6 and complete darkness; The FDT5 strain lysed Microcystis aeruginosa not directly but by secreting metabolites which could withstand high temperatures and pressure.

Keywords:

• Algae-lysing characteristic
• Algicidal bacteria
• 16S rDNA
• Ochrobactrum sp.

The authors would like to thank Mr. Patrick Cosme from Florida Atlantic University for his sincere help. We also acknowledge the support from grant (No. 20070246030 from Ministry of Education on the subject at the special doctoral research funds).