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Elevation of aminocyclopropane-1-carboxylic acid (ACC) and ethylene fails to induce extra division of guard mother cells in wild-type (WT) Arabidopsis seedlings. (A) Abaxial epidermis of cotyledons. Seedlings were grown on media with ACC or ethephon under a 16/8 h photoperiod or under constant darkness. Scale bars are 20 μm. (B) Abaxial epidermis of cotyledons of the wild-type and the eto1-1 mutant grown under constant darkness. Scale bars are 20 μm.
