Effects of Phaseic Acid and Dihydrophaseic Acid on Stomata and the Photosynthetic Apparatus

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Abstract
Plant extracts containing phaseic acid (PA), as well as solutions of purified PA and dihydrophaseic acid (DPA) were applied to leaves, isolated mesophyll cells, and isolated epidermal strips. In Commelina communis, stomatal closure began 4 minutes after the addition of either 20 micromolar (±)-abscisic acid or 10 micromolar PA. Stomata closed less rapidly after treatment with 10 micromolar PA than after treatment with 10 micromolar (±)-abscisic acid in Amaranthus powelli, Hordeum vulgare, Xanthium strumarium, and Zea mays and did not respond at all to PA in Vicia faba. DPA (10 micromolar) did not cause stomatal closure in any species.