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Science 11 July 2003:
Vol. 301. no. 5630, pp. 206 - 209
DOI: 10.1126/science.1085036
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Reports

Chloride Methylation by Plant Pectin: An Efficient Environmentally Significant Process

John T. G. Hamilton,1,2* W. Colin McRoberts,1 Frank Keppler,2 Robert M. Kalin,3 David B. Harper2

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.

1 Department of Agriculture and Rural Development for Northern Ireland, Newforge Lane, Belfast BT9 5PX, UK. 2 School of Agriculture and Food Science, Queen's University Belfast, Newforge Lane, Belfast BT9 5PX, UK. 3 Questor and Environmental Engineering Research Centres, Queen's University Belfast, Belfast BT9 5AG, UK.

* To whom correspondence should be addressed. E-mail: jack.hamilton{at}dardni.gov.uk

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