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曾佳颖, 江婧宇, 左俊, 李淑欣, 张斯隆, 宋立荣, 甘南琴. 不同无机碳转运基因型蓝藻对环境CO2变化的响应[J]. 水生生物学报, 2023, 47(7): 1069-1077. DOI: 10.7541/2023.2022.0078
引用本文: 曾佳颖, 江婧宇, 左俊, 李淑欣, 张斯隆, 宋立荣, 甘南琴. 不同无机碳转运基因型蓝藻对环境CO2变化的响应[J]. 水生生物学报, 2023, 47(7): 1069-1077. DOI: 10.7541/2023.2022.0078
ZENG Jia-Ying, JIANG Jing-Yu, ZUO Jun, LI Shu-Xin, ZHANG Si-Long, SONG Li-Rong, GAN Nan-Qin. RESPONSE OF CYANOBACTERIA WITH DIFFERENT INORGANIC CARBON TRANSPORT GENOTYPES TO ENVIRONMENTAL CO2 CHANGES[J]. ACTA HYDROBIOLOGICA SINICA, 2023, 47(7): 1069-1077. DOI: 10.7541/2023.2022.0078
Citation: ZENG Jia-Ying, JIANG Jing-Yu, ZUO Jun, LI Shu-Xin, ZHANG Si-Long, SONG Li-Rong, GAN Nan-Qin. RESPONSE OF CYANOBACTERIA WITH DIFFERENT INORGANIC CARBON TRANSPORT GENOTYPES TO ENVIRONMENTAL CO2 CHANGES[J]. ACTA HYDROBIOLOGICA SINICA, 2023, 47(7): 1069-1077. DOI: 10.7541/2023.2022.0078

不同无机碳转运基因型蓝藻对环境CO2变化的响应

RESPONSE OF CYANOBACTERIA WITH DIFFERENT INORGANIC CARBON TRANSPORT GENOTYPES TO ENVIRONMENTAL CO2 CHANGES

  • 摘要: 为了探究不同无机碳(Ci)转运基因型蓝藻与湖泊水体pH变化的关系, 文章优化了水体中不同无机碳转运基因型蓝藻相对丰度的检测方法, 测定了太湖、滇池及武汉市18个湖泊中具有不同无机碳(Ci)转运基因型蓝藻的相对丰度, 并结合水体pH进行分析。结果发现, 在所有湖泊中均存在bicA株、sbtA株及bicA+sbtA株, 其中sbtA株分布最为广泛; 随着水体中pH升高, sbtA株优势度随之增加。为了进一步解析不同Ci转运基因型蓝藻对CO2浓度变化的响应, 研究了室内纯培养条件下bicA株、sbtA株及bicA+sbtA株分别在高浓度(1000 ppm)和低浓度(100 ppm)CO2下的竞争。结果显示, 在低Ci水平下sbtA株具有明显竞争优势, 而在高Ci水平下bicA株占据了优势地位。上述研究表明随着CO2浓度的上升, 水华蓝藻中bicA株会具有竞争优势。大气CO2浓度上升可能会显著影响水华蓝藻的群落组成。

     

    Abstract: The continuous rise of atmospheric CO2 concentration will alter the physiological and ecological response in cyanobacteria. The CO2 concentration mechanism (CCM) of cyanobacteria is one of the important competitive advantages in the formation of water bloom. Different transport systems in the CCM of cyanobacteria have different characteristics. For example, bicA is a bicarbonate transporter with high throughput and low affinity, while sbtA with high affinity but low throughput. In order to explore the relationship between different inorganic carbon (Ci) transport genotypes of cyanobacteria and pH changes in lake water, this paper optimized the detection protocol of the relative abundance of cyanobacteria with different inorganic carbon transport genotypes in water. We measured the relative abundance of various cyanobacteria species with different Ci transport genotypes in Taihu Lake, Dianchi Lake and 18 lakes in Wuhan, and combined with the pH value in the water body to analyze the response of different Microcystis genotypes to CO2 changes. It was showed that bicA strains, sbtA strains and bicA+sbtA strains all exist simultaneously in the sampled lakes, and the sbtA strains was the most widely distributed. With the increase of pH in water, the dominance of sbtA strains increased. In order to further analyze the response of different Ci transport genotypes of cyanobacteria to the change of CO2 concentration, we studied the competition of bicA strains, sbtA strains and bicA+sbtA strains under high concentration (1000 ppm) and low concentration (100 ppm) carbon dioxide respectively. The results showed that sbtA strains had obvious competitive advantage at low Ci level, while bicA strains occupied a dominant position at high Ci level. Our study showed that with the increase of CO2 concentration, bicA strains in cyanobacteria bloom would have a competitive advantage. Therefore, we predict that the increase of atmospheric CO2 concentration will affect the community composition of bloom cyanobacteria.

     

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