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作 者:曾佳颖 江婧宇 左俊 李淑欣 张斯隆 宋立荣[1] 甘南琴[1] ZENG Jia-Ying;JIANG Jing-Yu;ZUO Jun;LI Shu-Xin;ZHANG Si-Long;SONG Li-Rong;GAN Nan-Qin(State Key Laboratory of Fresh Water Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China;University of Chinese Academy of Sciences,Beijing 100049,China;Aquatic EcoHealth Group,Fujian Key Laboratory of Watershed Ecology,Key Laboratory of Urban Environment and Health,Institute of Urban Environment,Chinese Academy of Sciences,Xiamen 361021,China;Wuhan Britain-China School,Wuhan 430034,China)
机构地区:[1]中国科学院水生生物研究所淡水生态与生物技术国家重点实验室,武汉430072 [2]中国科学院大学,北京100049 [3]中国科学院城市环境研究所城市环境与健康重点实验室福建省流域生态重点实验室水生态健康组,厦门361021 [4]武汉英中高级中学,武汉430034
出 处:《水生生物学报》2023年第7期1069-1077,共9页Acta Hydrobiologica Sinica
基 金:产毒蓝藻应对CO_(2)浓度变化的基因演变和生理响应(32071601)资助。
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CO_(2)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)CO_(2)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CO_(2)浓度的上升,水华蓝藻中bicA株会具有竞争优势。大气CO_(2)浓度上升可能会显著影响水华蓝藻的群落组成。The continuous rise of atmospheric CO_(2) concentration will alter the physiological and ecological response in cyanobacteria.The CO_(2) 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 CO_(2) 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 CO_(2) 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 CO_(2) concentration,bicA strains in cyanobacteria bloom would have a competitive advantage.Therefore,we predict that the increase of atmospheric CO_(2) concentration will affect the community composition of bloom cyanobacteria.
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