|
| Effect of BDE-209 on Characteristics of Soil Microbial PLFAs |
| Received:October 18, 2014 |
| View Full Text View/Add Comment Download reader |
| KeyWord:decabromodiphenyl ether;soil microorganisms;phospholipid fatty acids;soil environment quality |
| Author Name | Affiliation | E-mail | | XIE Deng-ke | Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education Institutes, School of Environment, Jinan University, Guangzhou 510632, China | | | FU An | Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education Institutes, School of Environment, Jinan University, Guangzhou 510632, China | | | LIN Yao-dong | Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education Institutes, School of Environment, Jinan University, Guangzhou 510632, China | | | QIN Hua-ming | Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education Institutes, School of Environment, Jinan University, Guangzhou 510632, China | huamingqin@163.com | | MO Ce-hui | Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation of Guangdong Higher Education Institutes, School of Environment, Jinan University, Guangzhou 510632, China | |
|
| Hits: 2676 |
| Download times: 2781 |
| Abstract: |
| Decabromodiphenyl ether(BDE-209) pollution in soils has drawn increasing concerns. However, there is little information available about its impacts on soil microorganisms. A laboratory experiment was designed to examine the composition and contents of microbial phospholipid fatty acids(PLFAs) in soil treated with different concentrations of BDE-209. A total of 20 PLFAs including internal standard 19:0 were detected in soil contaminated by BDE-209, implying relatively abundant microbial community. The compositions of microbial PLFAs were mainly saturated fatty acids, with 16:0 fatty acids being the highest content. The contents of monounsaturated fatty acids, polyunsaturated fatty acids, branched fatty acids and cyclopropane fatty acids were relatively low. Compared with the control, the change of microbial PLFAs was divided into three groups in 1.0 mg·kg-1 BDE-209 treatment, while it was four groups in 10.0 and 100 mg·kg-1 BDE-209 treatments, indicating that BDE-209 concentrations impacted microbial compositions. BDE-209 had significant impacts on the signature PLFAs of soil bacteria, fungi, and actinomycetes, and total microbial biomass. Fungi were most sensitive, but bacteria most tolerant to BDE-209, thus the greatest increases observed in bacteria. The gram-positive bacteria were more likely to survive than the gram-negative bacteria under BDE-209 stress. The microorganisms with 16:1ω7t signature fatty acids were stronger in stress resistance than those with 16:1ω7c signature fatty acids. Principal component analysis showed that the control and the treatments at 1.0 and 10 mg·kg-1 were significantly positively correlated with the first principal component while the treatment at 100 mg·kg-1 was significantly positively correlated with the second principal component. The microorganisms with 16:0, 18:0, 18:1ω7t, 18:2ω6, 9 signature fatty acids were dominant species in the first principal component, and those with i17:0 and a15:0 fatty acids were dominant in the second principal component. These results show that signature PLFAs were sensitive to analyze the responses of soil microbial community to BDE-209 and could be used as an efficient biological indicator of soil environment quality under BDE-209 stress. |
|
|
|
