Microbial Communities Along 2,3,7,8-tetrachlorodibenzodioxin Concentration Gradient in Soils Polluted with Agent Orange Based on Metagenomic Analyses.

Autor: Tran HT; Department of Biology, Vinh University, Vinh, Nghe An, 461010, Vietnam., Nguyen HM; Center for responding to climate change, Department of Climate Change, Ministry of Natural Resources and Environment, Hanoi, 125000, Vietnam., Nguyen TM; Analytical laboratory for Environment, Dioxin and Toxins, Northern Center for Environmental Monitoring, Vietnam Environment Administration, Hanoi, 115000, Vietnam., Chang C; Department of Life Sciences, National Cheng Kung University, Tainan, 70101, Taiwan., Huang WL; Department of Life Sciences, National Cheng Kung University, Tainan, 70101, Taiwan., Huang CL; Institute of Tropical Plant Sciences and Microbiology, National Cheng Kung University, Tainan, 70101, Taiwan. clhuang65535@gmail.com., Chiang TY; Department of Life Sciences, National Cheng Kung University, Tainan, 70101, Taiwan. tychiang@mail.ncku.edu.tw.
Jazyk: angličtina
Zdroj: Microbial ecology [Microb Ecol] 2023 Jan; Vol. 85 (1), pp. 197-208. Date of Electronic Publication: 2022 Jan 16.
DOI: 10.1007/s00248-021-01953-y
Abstrakt: The 2,3,7,8-tetrachlorodibenzodioxin (TCDD), a contaminant in Agent Orange released during the US-Vietnam War, led to a severe environmental crisis. Approximately, 50 years have passed since the end of this war, and vegetation has gradually recovered from the pollution. Soil bacterial communities were investigated by 16S metagenomics in habitats with different vegetation physiognomies in Central Vietnam, namely, forests (S0), barren land (S1), grassland (S2), and developing woods (S3). Vegetation complexity was negatively associated with TCDD concentrations, revealing the reasoning behind the utilization of vegetation physiognomy as an indicator for ecological succession along the gradient of pollutants. Stark changes in bacterial composition were detected between S0 and S1, with an increase in Firmicutes and a decrease in Acidobacteria and Bacteroidetes. Notably, dioxin digesters Arthrobacter, Rhodococcus, Comamonadaceae, and Bacialles were detected in highly contaminated soil (S1). Along the TCDD gradients, following the dioxin decay from S1 to S2, the abundance of Firmicutes and Actinobacteria decreased, while that of Acidobacteria increased; slight changes occurred at the phylum level from S2 to S3. Although metagenomics analyses disclosed a trend toward bacterial communities before contamination with vegetation recovery, non-metric multidimensional scaling analysis unveiled a new trajectory deviating from the native state. Recovery of the bacterial community may have been hindered, as indicated by lower bacterial diversity in S3 compared to S0 due to a significant loss of bacterial taxa and recruitment of fewer colonizers. The results indicate that dioxins significantly altered the soil microbiomes into a state of disorder with a deviating trajectory in restoration.
(© 2022. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
Databáze: MEDLINE
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