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| Influence of Bacillus laterosporus on Microcystis aeruginosa Growth |
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| KeyWord:Bacillus laterosporus; Microcystis aeruginosa; co-substrates; stress; inorganic nitrogen |
| Author Name | Affiliation | | WANG Qiong | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China | | WU Wei | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China
2.Freshwater Fisheries Research Center, Key Laboratory of Inland Fishery Eco-environment and Resource, Chinese Academy of Fishery Sciences, Wuxi 214081, China | | JI Li | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China |
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| Abstract: |
| Interactions of algae and algae-inhibiting bacteria often control the stability of aquatic ecosystems. In this study the influence of Bacillus laterosporus SK-1 on the growth of Microcystis aeruginosa was examined under different initial biomass and at different growing periods. Concentrations of inorganic nitrogen（NO-3-N, NO-2-N, NH+4-N） in the system were also monitored. A growth media with 250∶10∶1 of C∶N∶P ratio obtained by adding glucose and ammonia nitrogen to eutrophic water was used to grow Bacillus laterosporus and Microcystis aeruginosa. The bacteria had different stresses on the growth of Microcystis aeruginosa at different growth stages. The strain SK-1 at its stable stage had the greatest inhibitory effect on Microcystis aeruginosa of early growth stages. The more the initial SK-1 amount, the greater algae-inhibiting effect. The strain SK-1 inhibited the growth of Microcystis aeruginosa mainly through competing nutrients and secreting extracellular algae-inhibiting substances. The relative proportion of these two processes were different at different growth stages of algae and bacteria. The results suggest that bacteria should be inoculated prior to algae outbreak to best control algae ecologically. |
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