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Isolation, identification, and algicidal activity of aerobic denitrifying bacterium R11 and its effect on Microcystis aeruginosa

机译:好氧反硝化细菌R11的分离鉴定和杀藻活性及其对铜绿微囊藻的影响

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Recently, algicidal bacteria have attracted attention as possible agents for the inhibition of algal water blooms. In this study, an aerobic denitrifying bacterium, R11, with high algicidal activity against the toxic Microcystis aeruginosa was isolated from lake sediments. Based on its physiological characteristics and 16S rRNA gene sequence, it was identified as Raoultella, indicating that the bacterium R11 has a good denitrifying ability at 30 degrees C and can reduce the concentration of nitrate-N completely within 36 h. Additionally, different algicidal characteristics against Microcystis aeruginosa were tested. The results showed that the initial bacterial cell density and algal cell densities strongly influence the removal rates of chlorophyll a. Algicidal activity increased with an increase in the bacterial cell density. With densities of bacterial culture at over 2.4 x 10(5) cell/mL, algicidal activity of up to 80% was obtained in 4 days. We have demonstrated that, with the low initial algal cell density (OD680 less than 0.220), the algicidal activity reached was higher than 90% after 6 days.
机译:近来,杀藻细菌作为抑制藻类水华的可能试剂已引起关注。在这项研究中,从湖泊沉积物中分离出了一种对有毒的铜绿微囊藻具有高杀藻活性的好氧反硝化细菌R11。根据其生理特性和16S rRNA基因序列,鉴定为Raoultella,表明R11细菌在30摄氏度时具有良好的反硝化能力,可以在36 h内完全降低硝酸盐氮的浓度。另外,测试了针对铜绿微囊藻的不同杀藻特性。结果表明,初始细菌细胞密度和藻类细胞密度强烈影响叶绿素a的去除率。杀藻活性随细菌细胞密度的增加而增加。细菌培养的密度超过2.4 x 10(5)细胞/ mL,在4天内获得了高达80%的杀藻活性。我们已经证明,由于初始藻细胞密度低(OD680小于0.220),在6天后达到的杀藻活性高于90%。

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