Abstract

Abstract. Treatment of tomato seedlings with 5 mM benzo‐18‐crown‐6, a potassium ionophore, produced a reduction in transpiration of 40%. Treatments of epidermal strips of Commelina communis with ben‐zo‐18‐crown‐6 (1‐l0mM) inhibited stomatal opening, and this effect was shown to be reversible. An antagonistic interaction between abscisic acid (10−7M) and benzo‐18‐crown‐6 (4 × 10−3 M) was also observed.

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