Journal of Tianjin Agricultural University ›› 2022, Vol. 29 ›› Issue (2): 57-62.doi: 10.19640/j.cnki.jtau.2022.02.012

• Researches and Scientific Notes • Previous Articles     Next Articles

Isolation of symbiotic bacteria of Euglena gracilis and effects on the growth of algal cells

Wang Xiaoyu1, Ren Shutian2, Wu Yating2, Wu Zun2, Gao Haofeng2, Shao Peng2,Corresponding Author   

  1. 1. Tianjin Fisheries Research Institute, Tianjin 300221, China;
    2. College of Fisheries, Tianjin Agricultural University, Tianjin 300392, China
  • Received:2022-05-01 Online:2022-06-30 Published:2022-07-05

Abstract: The symbiotic bacteria of Euglenum gracilis were isolated, and the influence of symbiotic bacteria on the growth of Euglenum gracilis was studied. The symbiotic bacteria were isolated by plate scribing and identified by 16S rDNA gene sequencing. Five species of symbiotic bacteria were obtained, E1-Paraburkholderia fungorum, E3-Methylobacterium radiotolerans, E5-Sphingomonas dokdonensis, E6-Ralstonia insidiosa and ET2-Leifsonia soli, which belong to α-Proteobacteria, β-Proteobacteria and Actinobacteria, respectively. The results demonstrated that E1, E3 and E5 could enhance the growth of Euglenum gracilis by measuring the cell density and chlorophyll content of algae in co-culture systems of bacteria and algae, and that E5 had the best effect. The promoting effect of Euglena gracilis was best when initial inoculation concentration of E5 bacterium was 107 cfu/mL and the initial cell density of Euglena gracilis was 1×105 cells/mL.

Key words: Euglena gracilis, symbiotic bacteria, co-culture of bacteria and algae

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