Ability of Bacillus amyloliquefaciens to inhibit growth of Anabaena flos-aquae and the inhibition mechanism
解淀粉芽孢杆菌对鱼腥藻的抑藻效果分析与机理初探

An algae-lysing bacterium strain DC1 was isolated from Dianchi Lake and identified as Bacillus amyloliquefaciens using 16S rDNA sequence analysis technique. It was widely distributed in natural environment. This bacterium could produce antibiotics, antibacterial protein and polypeptide to achieve biological control. However, its algae-lysing ability has not been reported. In this study, the algae-inhibiting effect and algicidal mechanism were investigated. The results showed that DC1 has especially good effects on lysing Anabaena flos-aquae. When the DC1 density was 108 cells mL-1 and the initial concentration of Bacillus amyloliquefaciens ranged from 0.23 ~1.92 mg L-1, the average removal rate would reach 95.54% - 91.35%, averagely 93.5% after 6 days. The density of the DC1 and Bacillus amyloliquefaciens were related with the removal rate. Some extracellular substance produced by this strain had the algae-lysing ability, and it is thermo-stable and non-protein substance.