Issue Date: September 29, 2008
Plants' Chemical SOS
Walnut trees under stress fill the air with significant quantities of methyl salicylate, an ester of salicylic acid, according to a report in Biogeosciences (2008, 5, 1287). This chemical warning system could help farmers identify ailing crops before visible indicators such as dead leaves appear. Thomas Karl and coworkers of the National Center for Atmospheric Research, in Boulder, Colo., accidentally detected airborne methyl salicylate when attempting to monitor levels of climate-influencing . . .
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