Rice summons pest-killing wasps by sniffing out which bug laid the eggs
Zhu XY, Yuan N, Li FQ, Wang T, Jayasinghe WH
Plant Signaling
Rice fields across Asia may already be running a chemical communication network that calls in allies to kill pests before they hatch, and understanding it could help farmers grow food with far fewer pesticides.
When a specific rice pest lays eggs on a rice plant, the plant releases a blend of chemicals into the air that acts like a distress beacon, drawing in a tiny wasp that destroys the eggs before they hatch. The plant can tell this pest's eggs apart from those of other insects and only sends the full alarm signal for the specialist attacker. Scientists traced this response to just two genes, and when they switched those genes off using a genetic editing tool, the plant went silent and the wasps stopped coming.
Key Findings
Rice releases a distinct volatile blend in response to striped stem borer eggs that attracts the egg parasitoid Trichogramma japonicum, while eggs from two generalist pests trigger no such attraction.
Two compounds, D-limonene and methyl salicylate, are the key attractants; they are produced via genes OsTPS46 and OsPAL3, and CRISPR knockout of either gene markedly reduces or eliminates parasitoid attraction.
The specialist egg response involves an oxidative burst and salicylic acid accumulation paired with jasmonic acid suppression, a hormonal signature distinct from typical herbivory responses.
chevron_right Technical Summary
Rice plants can tell apart eggs laid by different pest insects and release a custom chemical signal that summons a tiny parasitic wasp only when its most damaging specialist pest attacks. Two genes control this targeted chemical alarm, and knocking them out shuts off the plant's ability to call for help.
Abstract Preview
Original paper
Rice Distinguishes Eggs of a Specialist versus Generalist Herbivores and Emits Species-Specific Volatiles to Recruit an Egg Parasitoid.
Plants release herbivore-induced volatiles that attract parasitoid wasps. Whether plants can distinguish eggs of different insect species and mount targeted indirect defenses remains unclear. Here,...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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