Aphids decide to grow wings based on crowding and energy
Lu JM, Liu YJ, Wang L, Xie XC, Ding BY
Invasive Species
The aphids clustering on your roses or tomato stems can sense overcrowding and switch some offspring to winged form so they can fly off and infest new plants, and this study maps the exact molecular trigger behind that escape plan.
Aphids are unusual insects because the same parent can produce wingless babies or winged ones depending on conditions, and winged aphids are the ones that spread to new plants. Researchers found that when aphid colonies get crowded, a hormone signal shuts down a tiny RNA molecule that normally blocks wing production, essentially flipping a switch that says 'build wings now.' A second hormone signal later controls whether those wings actually finish developing properly by managing the insect's sugar and energy stores.
Key Findings
Two separate microRNA pathways (miR-317 and miR-305) both target the same gene, glycogen phosphorylase (GP), but at different stages: one controls whether wings form at all, the other controls whether wings develop correctly.
Under crowded conditions, juvenile hormone triggers breakdown of pre-miR-317, which lifts repression on GP and boosts production of winged offspring, without causing wing malformations.
Knocking down GP impaired glycogen breakdown and lowered ATP levels, producing wing defects, showing wing development has a direct metabolic energy requirement.
chevron_right Technical Summary
Scientists discovered the internal switch that decides whether aphids grow wings or stay wingless, a decision driven by crowding and hormones acting through tiny RNA molecules that control the insect's energy supply.
Abstract Preview
Original paper
Hormone-dependent miRNA cascades converge on glycogen phosphorylase to regulate wing plasticity in aphids.
Phenotypic plasticity enables organisms to adapt to changing environments, yet how environmental cues generate alternative phenotypes remains largely unclear. Aphid wing plasticity offers a tractab...
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