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Ethylene action keeps the bees away
Pollination often results in rapid fading of flowers in association with cessation of nectar and pollen production. This colour change deters many insect pollinators thus directing them to younger, more rewarding flowers. By surveying 50 families and 200 species, Wouter van Doorn (pp. 375-383) finds that species that change flower colour on pollination also respond in this way to applied ethylene.
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