US: Mown grass smell sends SOS for help in resisting insect attacks

The smell of cut grass in recent years has been identified as the plant’s way of signalling distress, but new research says the aroma also summons beneficial insects to the rescue.

“When there is need for protection, the plant signals the environment via the emission of volatile organic compounds, which are recognized as a feeding queue for parasitic wasps to come to the plant that is being eaten and lay eggs in the pest insect,” said Dr. Michael Kolomiets, Texas A&M AgriLife Research plant pathologist in College Station.

The research stems from a look at the function of a large family of lipid-derived molecular signals that regulate differential processes in humans, animals and plants, according to Kolomiets, whose research was published in The Plant Journal.

In an effort to better understand these signals, the U.S. Department of Agriculture is granting Kolomiets $490,000 in 2015 to study how the signals may also impact drought tolerance.

The molecular signals are less understood in plants than in animals and humans, he noted.

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