Microbial community variation in phytoremediation of triazophos by Canna indica Linn. in a hydroponic system  

作　　者：Huiping Xiao Shuiping Cheng Zhenbin Wu 

机构地区：[1]State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, the Chinese Academy of Sciences, Wuhan 430072, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100039, China

出　　处：《Journal of Environmental Sciences》2010年第8期1225-1231,共7页环境科学学报（英文版）

基　　金：supported by the National Natural Sci-ence Fundation of China (No. 20877093);the StateKey Laboratory of Freshwater Ecology and Biotechnology(No. 2008FBZ11)

摘　　要：Phytoremediation of triazophos （O,O-diethyl-O-（1-phenyl-1,2,4-triazole-3-base） sulfur phosphate, TAP） pollution by Canna indica Linn. in a hydroponic system has been well studied, whereas the microbial mechanism on TAP degradation is still unknown. The variation in microbial community compositions was investigated by analyzing phospholipid fatty acids （PLFAs） profiles in microbes under TAP exposure. The TAP exposure resulted in an increase in proportions of fatty acid 16：0 and decrease in fatty acid 18：2ω9,12c, indicating that TAP may stimulate the reproduction of microorganisms and inhibit the growth of fungi to some degree. Significant correlation was found between the ratio of fungi to bacteria and TAP removal （r 2 = 0.840, p 0.01）. In addition, the microbial community in the phytoremediation system with C. indica was dominated by Gram negative bacteria, which possibly contributed to the degradation of TAP. These results indicated that TAP might induce the colonization of bacteria in the hydroponic system planted with C. indica, and lead to a discrimination of microbial community, which might be one of the mechanisms on TAP dissipation in phytoremediation system.Phytoremediation of triazophos （O,O-diethyl-O-（1-phenyl-1,2,4-triazole-3-base） sulfur phosphate, TAP） pollution by Canna indica Linn. in a hydroponic system has been well studied, whereas the microbial mechanism on TAP degradation is still unknown. The variation in microbial community compositions was investigated by analyzing phospholipid fatty acids （PLFAs） profiles in microbes under TAP exposure. The TAP exposure resulted in an increase in proportions of fatty acid 16：0 and decrease in fatty acid 18：2ω9,12c, indicating that TAP may stimulate the reproduction of microorganisms and inhibit the growth of fungi to some degree. Significant correlation was found between the ratio of fungi to bacteria and TAP removal （r 2 = 0.840, p 0.01）. In addition, the microbial community in the phytoremediation system with C. indica was dominated by Gram negative bacteria, which possibly contributed to the degradation of TAP. These results indicated that TAP might induce the colonization of bacteria in the hydroponic system planted with C. indica, and lead to a discrimination of microbial community, which might be one of the mechanisms on TAP dissipation in phytoremediation system.

关 键 词：microbial community phospholipid fatty acids TRIAZOPHOS PHYTOREMEDIATION Canna indica Linn. 

分 类 号：X172[环境科学与工程—环境科学] TP316.7[自动化与计算机技术—计算机软件与理论]