Physiological and biochemical responses of Microcystis aeruginosa to phosphine(PH 3)under elevated CO2  

作　　者：Xiaojun Niu Dongqing Zhang Runyuan Zhang Qi Song Yankun Li Mo Wang 

机构地区：[1]School of Environmental Science and Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,China [2]School of Environment and Energy,South China University of Technology,Guangzhou 510006,China [3]State Key Laboratory of Pollution Control and Resource Reuse,Nanjing 210093,China [4]Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control,Guangzhou 510640,China [5]College of Architecture and Urban Planning,Guangzhou University,Guangzhou 510006,China

出　　处：《Journal of Environmental Sciences》2020年第8期171-178,共8页环境科学学报（英文版）

基　　金：This work was supported by the Natural Science Foundation of Guangdong Province(No.2017A030313239);Research Project of Sino-Singapore International Joint Research Institute(No.202-A018001);the Jiangsu Natural Science Foundation(Nos.BK20180109,BK);the State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences(No.2016SKL011);the Ministry of Science and Technology of China for State Key Research and Development Project(No.2016YFC04007082);the Student Research Project of South China University of Technology(No.7387);and the State Key Laboratory of Pollution Control and Resource Reuse(No.PCRRF14006,PCRRF17018).

摘　　要：Phosphine(PH3)is an important factor driving the outbreak of cyanobacterial blooms that produce toxic microcystin threating human health.To clarify the physiological and biochemical responses of cyanobacteria to PH3 under elevated CO2 concentration,Microcystis aeruginosa was used in the coupling treatment of 1000 ppmv CO2 and PH3 at different concentrations respectively.The chlorophyll a(Chl-a),carotenoid,net photosynthetic rate and total protein of M.aeruginosa exhibited evidently increasing tendency under the coupling treatment of 1000 ppmv CO2 and PH 3 at different concentrations(7.51×10^−3,2.48×10^−2,7.51×10^−2 mg/L).The coupling treatments resulted in the higher concentrations of Chl-a and carotenoid of M.aeruginosa,compared to those in the control and the treatment with CO2 alone,and their enhancement increased with the increase in PH 3 concentrations.The total antioxidant capacity(T-AOC)in the coupling treatment with CO2 and PH3 of 2.48×10^−2 mg/L and 7.51×10^−3 mg/L showed increasing tendency,compared to the treatment with PH 3 alone.Additionally,the coupling treatment with 1000 ppmv CO2 and PH3 also altered the pH and DO level in the culture medium.In this regard,the coupling treatment with CO2 and PH3 at an appropriate concentration can enhance the resistance of M.aeruginosa to PH3 toxicity and is beneficial to the reproduction of M.aeruginosa,presumably resulting in potential for the outbreak of cyanobacteria bloom.Given the concern about global warming and the increase in atmospheric CO2 level,our research laid a foundation for the scientific understanding of the correlation between PH3 and cyanobacteria blooms.

关 键 词：PHOSPHINE M.aeruginosa CO2 Cyanobacteria bloom 

分 类 号：X52[环境科学与工程—环境工程]