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Effects of coexisting bacteria on the growth of Microcystis aeruginosa under different carbon sources

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不同碳源下共存细菌对铜绿微囊藻生长的影响

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Feb.2024, Vol.47 No.2: 154-160, 232

DOI: 10.3969/j.issn.1003-5060.2024.02.002

Authors

SUN Hualong, CHEN Guowei, WU Xuefei, FANG Zhipeng, JIA Wei, LIU Li

(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: Microcystis aeruginosa can utilize the inorganic carbon in water environment for photosynthesis and carbon fixation through carbon concentrating mechanism (CCM) to promote its growth, which is the dominant species that causes freshwater cyanobacteria bloom. The algal-bacterial symbiosis system is an important part of natural water systems, which plays an important role in regulating algal blooms, while the system under different carbon source combinations adds many unknowns to the growth and reproduction of algae. In this paper, Microcystis aeruginosa was selected as the research object to explore the effects of exogenous carbon source on the growth of Microcystis aeruginosa under different initial ratios of bacteria to algae. When the concentration of the total carbon (TC) was 25 mg/L, the combination of inorganic carbon source and organic carbon source was added, and the initial ratio of bacteria to algae in the environment was 1:2, the predicted maximum biomass of Microcystis aeruginosa in the culture cycle reached $ 5.0 \times 10^{7} $ cell/mL, which was 2.05 times higher than that of the pure algae control group. When 25 mg/L organic carbon source was added and the initial ratio of bacteria to algae was 5:1, the predicted maximum biomass in the culture cycle reached the minimum, which was $ 1.5 \times 10^{7} $ cell/mL, which was only 0.76 times that of the pure algae control group. The results showed that the addition of initial bacteria under different carbon sources would

Keywords: carbon source; coexisting bacteria; microalgae growth; ratio of bacteria to algae

作者信息

孙华龙，陈国炜，吴雪菲，方志鹏，贾伟，刘丽

（合肥工业大学土木与水利工程学院，安徽合肥230009）

摘要和关键词

摘要: 铜绿微囊藻(Microcystis aeruginosa)可通过二氧化碳浓缩机制(carbon concentrating mechanism, CCM)利用水环境中的无机碳进行光合固碳来促进自身生长, 是引发淡水蓝藻水华的优势种。自然水体生态系统中菌藻共生体系是其重要组成部分, 对藻华起到重要调控作用, 但有关不同碳源条件下共生细菌对蓝藻藻华的影响仍不清楚。文章以铜绿微囊藻为模式蓝藻, 探究在不同碳源组合下共存细菌对其生长的影响。在总碳(total carbon, TC)质量浓度为25 mg/L的无机碳源和有机碳源组合, 环境初始菌藻比为1:2时, 铜绿微囊藻的最大生物量达到最大值 $ 5.0 \times 10^{7} $个/mL, 是纯藻对照组最大生物量的2.05倍; 在加入25 mg/L的有机碳源, 初始菌藻比为5:1时, 培养周期内可预测的最大生物量达到最小, 为 $ 1.5 \times 10^{7} $个/mL, 仅为纯藻对照组最大生物量的0.76倍。结果表明: 不同碳源下初始细菌的出现会极大程度地影响铜绿微囊藻的生长, 其中, 在无机碳源和混合碳源的营养条件下, 初始细菌显著加快了铜绿微囊藻的生长繁殖。

关键词: 碳源；共存细菌；微藻生长；菌藻比

Funding

国家自然科学基金资助项目（42277298）

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