September 19, 2008

Researchers Find Stressed Plants Produce Aspirin-Like Chemical

Researchers reported on Thursday that plants stressed by drought or unseasonable temperatures squirt out an aspirin-like chemical that may be a sort of immune response that helps protect the plants, the scientists speculated.

The finding raises the possibility that farmers, forest managers and others may eventually be able to start monitoring plants for early signs of a disease, an insect infestation or other types of stress, they said.

Currently they often do not know if an ecosystem is unhealthy until there are visible indicators, such as dead leaves.

"Unlike humans, who are advised to take aspirin as a fever suppressant, plants have the ability to produce their own mix of aspirin-like chemicals, triggering the formation of proteins that boost their biochemical defenses and reduce injury," said NCAR scientist Thomas Karl, the lead researcher.

"Our measurements show that significant amounts of the chemical can be detected in the atmosphere as plants respond to drought, unseasonable temperatures or other stresses."

Researchers were aware that plants in the laboratory produce a form of aspirin known as methyl salicylate, they had never looked for it in the forest.

But they discovered measurable amounts of methyl salicylate when they set up measuring devices in a walnut grove near Davis, Calif., to monitor plant emissions that can affect pollution.

Plants being eaten by animals also produce chemicals that can be sensed by other plants nearby, according to previous studies.

Measuring instruments 100 feet above the ground measured methyl salicylate from plants that were stressed by a local drought and unseasonably cool nighttime temperatures followed by large daytime temperature increases.

Farmers and forest managers may be able to monitor for methyl salicylate to watch for early signs of disease, insect infestation, or other types of stress long before leaves begin to wither and drop off.

They reported in addition to having an immune-like function, the chemical may be a means for plants to communicate to neighboring plants, warning them of the threat.

"These findings show tangible proof that plant-to-plant communication occurs on the ecosystem level," says NCAR scientist Alex Guenther, a co-author of the study. "It appears that plants have the ability to communicate through the atmosphere."

Karl added: "If you have a sensitive warning signal that you can measure in the air, you can take action much sooner, such as applying pesticides. The earlier you detect that something's going on, the more you can benefit in terms of using fewer pesticides and managing crops better."

The new findings, announced Thursday by NCAR in Boulder, Colo., were published in the journal Biogeosciences. The National Science Foundation, NCAR's sponsor, funded the research.


On The Net:

The Journal Biogeosciences

The National Science Foundation