Microbial community variation in phytoremediation of triazophos
by Canna indica Linn. in a hydroponic system |
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Authors: | Huiping Xiao Shuiping Cheng and Zhenbin Wu |
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Institution: | 1. State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,the Chinese Academy of Sciences,Wuhan 430072,China;Graduate University of Chinese Academy of Sciences,Beijing 100039,China 2. State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,the Chinese Academy of Sciences,Wuhan 430072,China |
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Abstract: | 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 18:2!9,12c,
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 (r2 = 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. |
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Keywords: | microbial community phospholipid fatty acids triazophos phytoremediation Canna indica Linn |
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