The mechanism of different cyanobacterial responses to glyphosate  

作　　者：Wei Lin Zhenyan Zhang Yiling Chen Qi Zhang Mingjing Ke Tao Lu Haifeng Qian 

机构地区：[1]College of Environment,Zhejiang University of Technology,Hangzhou 310032,China [2]Institute of Environmental and Ecological Engineering,Guangdong University of Technology,Guangzhou 510006,China

出　　处：《Journal of Environmental Sciences》2023年第3期258-265,共8页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 21976161, 21777144, 41907210)。

摘　　要：Glyphosate, the most extensively used herbicide globally, has raised ecotoxicological concerns because it can be transported into the aquatic environment and cause adverse effects on the aquatic system. However, the functional mechanism of glyphosate on cyanobacteria are not completely disentangled. In this study, we selected six common cyanobacteria to evaluate glyphosate effects on cyanobacterial growth in monoculture experiment. Results showed that the growth of five tested cyanobacterial species were promoted under different degrees, and only Pseudanabaena was inhibited by glyphosate. In the phylogenetic tree based on gene sequences of 5-enol-pyruvylshikimate-3-phosphate synthase(EPSPS),a target for glyphosate, we found that the position of Pseudanabaena is the closest to plant,which was sensitive to glyphosate, thereby explaining the inhibitory effect of Pseudanabaena following glyphosate exposure. The primary degraded metabolites or analogs did not induce cyanobacterial growth, laterally demonstrating that glyphosate was used as a source of phosphorus to accelerate cyanobacterial growth because phosphorus levels increased in the medium of glyphosate treatment. Overall, this study provides a better understanding of the influence of glyphosate on the composition of aquatic microbiota and explains the mechanism of cyanobacterial response to glyphosate.

关 键 词：CYANOBACTERIA PESTICIDES Microbial community ECOTOXICITY 

分 类 号：X171.5[环境科学与工程—环境科学] X592