Beans use an immune receptor to call in airstrikes on caterpillars
Nuke them from orbit
When they’re being eaten, bean plants release chemicals that draw in parasitic wasps.
For decades, scientists have understood that plants can release volatile organic compounds—essentially airborne chemical signals—to attract the natural enemies of the things that eat them, like caterpillars. What we didn’t know was exactly how a plant translates the physical act of being eaten into a specific, predator-summoning distress signal.
“[One] thing we didn’t know is how the plant detects the caterpillar in the first place,” says Adam Steinbrenner, a biologist at the University of Washington. Now, after years of experimenting with common bean plants in the lab and in the agricultural fields of Oaxaca, Mexico, Steinbrenner’s team pinpointed a single immune receptor that orchestrates its anti-caterpillar defense system.
Drooling caterpillars
When an herbivorous insect like a caterpillar feeds on a plant, it introduces its saliva straight into the plant’s damaged tissues. This saliva...
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