Polyphenols are a diverse group of organic compounds produced by plants.
Polyphenols are a diverse group of organic compounds produced by plants. These compounds are often toxic to microorganisms. In peatlands, scientists thought that microorganisms avoided this toxicity by degrading polyphenols using an enzyme that requires oxygen. However, when there is little or no oxygen, like after flooding due to climate induced thawing, the enzyme is inactive, and polyphenols accumulate. This inhibits microbes’ carbon cycling. In this study, scientists mined data for thousands of microbial genomes recovered from Stordalen Mire, an Arctic peatland in Sweden. They discovered that these microorganisms used alternative polyphenol-active enzymes, with and without oxygen. The study underscores the significance of polyphenols in peatland carbon dynamics. It also suggests that the carbon stored in these ecosystems is at greater risk to be released into the atmosphere by climate change than previously thought.
Arctic peatlands store vast amounts of carbon. As global temperatures increase and environments change in response, the stability of the carbon stored in these habitats has emerged as a pressing concern. Researchers delved deep into the soil microbiome, scrutinizing the functions of thousands of microorganisms in an Arctic peatland ecosystem. Contrary to previous assumptions, the study revealed that many microorganisms metabolize polyphenols. Scientists had believed that this complex class of carbon compounds was inert and an important part of carbon storage. Armed with this new insight, scientists are better equipped to forecast the impacts of climate change on Arctic ecosystems and devise targeted strategies for mitigating these effects.
Read more at DOE/US Department of Energy
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