Microbial degradation of 2,4-dichlorophenoxyacetic acid on the Greenland ice sheet.

Applied and Environmental Microbiology
Marek StibalC S Jacobsen

Abstract

The Greenland ice sheet (GrIS) receives organic carbon (OC) of anthropogenic origin, including pesticides, from the atmosphere and/or local sources, and the fate of these compounds in the ice is currently unknown. The ability of supraglacial heterotrophic microbes to mineralize different types of OC is likely a significant factor determining the fate of anthropogenic OC on the ice sheet. Here we determine the potential of the microbial community from the surface of the GrIS to mineralize the widely used herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). Surface ice cores were collected and incubated for up to 529 days in microcosms simulating in situ conditions. Mineralization of side chain- and ring-labeled [(14)C]2,4-D was measured in the samples, and quantitative PCR targeting the tfdA genes in total DNA extracted from the ice after the experiment was performed. We show that the supraglacial microbial community on the GrIS contains microbes that are capable of degrading 2,4-D and that they are likely present in very low numbers. They can mineralize 2,4-D at a rate of up to 1 nmol per m(2) per day, equivalent to ∼26 ng C m(-2) day(-1). Thus, the GrIS should not be considered a mere reservoir of all atmospheric contaminants, as...Continue Reading

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Citations

Sep 27, 2015·Research in Microbiology·Lorrie MaccarioCatherine Larose
Mar 19, 2015·Extremophiles : Life Under Extreme Conditions·Anna LazzaroJosef Zeyer
Aug 15, 2014·The Science of the Total Environment·Fabrizio CappaPier Sandro Cocconcelli
Apr 27, 2016·Environmental Microbiology·Joseph M CookTristram D L Irvine-Fynn
Mar 5, 2017·Applied and Environmental Microbiology·Yuanqi WangKonstantinos T Konstantinidis
Feb 21, 2019·Scientific Reports·Lorrie MaccarioCatherine Larose
May 12, 2020·Microbial Genomics·Arwyn EdwardsSara M E Rassner
May 3, 2019·Applied Microbiology and Biotechnology·Maria Pilar SerbentLorena Benathar Ballod Tavares
Aug 10, 2020·Environmental Science and Pollution Research International·Karen MagnoliCarla Lorena Barberis
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Dec 15, 2020·Journal of Microscopy·Moíses Amaral AmâncioHenrique Duarte da Fonseca Filho
Apr 18, 2021·Environmental Science and Pollution Research International·Nataliia GorodylovaKarine Michel
Jun 27, 2021·Nature Communications·T D L Irvine-FynnA Hubbard

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