Chloride Methylation by Plant Pectin: An Efficient Environmentally Significant Process

doi:10.1126/SCIENCE.1085036

Paper

Chloride Methylation by Plant Pectin: An Efficient Environmentally Significant Process

Published Jul 11, 2003 · J. Hamilton, W. C. Mcroberts, F. Keppler

Science

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Abstract

Atmospheric chloromethane (CH3Cl) plays an important role in stratospheric ozone destruction, but many uncertainties exist regarding the strengths of its sources and sinks and particularly regarding the processes generating this naturally occurring gas. Evidence is presented here that CH3Cl is produced in many terrestrial environments by a common mechanism. Abiotic conversion of chloride to CH3Cl occurs readily in plant material, with the widespread plant component pectin acting as a methyl donor. Significant CH3Cl emissions from senescent and dead leaves were observed at ambient temperatures; those emissions rose dramatically when temperatures increased. This ubiquitous process acting in terrestrial ecosystems and during biomass burning could contribute the bulk of atmospheric CH3Cl.

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Study Snapshot

Plant pectin acts as a methyl donor to convert chloride to chloromethane, contributing to the bulk of atmospheric chloromethane and contributing to stratospheric ozone destruction.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

Chloride Methylation by Plant Pectin: An Efficient Environmentally Significant Process

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