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Ethylene is not always the natural regulator of flower abscission
Ethylene plays a major role in regulating floral abscission in many species, but is it a universal characteristic? By surveying 50 families and about 300 species of monocotyledons and eudicotyledons, Wouter van Doorn (pp. 689-693) shows that an exception is the orchid Cymbidum, which is ethylene-insensitive.
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