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Floral organ abscission in transgenic Arabidopsis expressing PGAZAT::GUS in the presence (+) or absence (-) of ethylene (10 μL L−1). A, Time course of abscission; B, flower at 0 h; C, E, and G, flowers maintained in the presence of ethylene for 6, 24, or 27 h; D, F, and H, flowers maintained in the absence of ethylene for 6, 24, or 27 h.
