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.
Plant extracts containing PA reduced photosynthesis, as reported by Kriedemann et al. (Aust J Plant Physiol 2: 553-567, 1975). Subsequent experiments with PA purified by crystallization and with residues of solvents employed in the extraction of PA proved that it was not PA that impaired photosynthetic O2 evolution or CO2 uptake but unidentified contaminants of the allegedly pure solvents.
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Selected References
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- Arnon D. I. COPPER ENZYMES IN ISOLATED CHLOROPLASTS. POLYPHENOLOXIDASE IN BETA VULGARIS. Plant Physiol. 1949 Jan;24(1):1–15. doi: 10.1104/pp.24.1.1. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Beardsell M. F., Cohen D. Relationships between Leaf Water Status, Abscisic Acid Levels, and Stomatal Resistance in Maize and Sorghum. Plant Physiol. 1975 Aug;56(2):207–212. doi: 10.1104/pp.56.2.207. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Dubbe D. R., Farquhar G. D., Raschke K. Effect of abscisic Acid on the gain of the feedback loop involving carbon dioxide and stomata. Plant Physiol. 1978 Sep;62(3):413–417. doi: 10.1104/pp.62.3.413. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Harrison M. A., Walton D. C. Abscisic Acid Metabolism in Water-stressed Bean Leaves. Plant Physiol. 1975 Aug;56(2):250–254. doi: 10.1104/pp.56.2.250. [DOI] [PMC free article] [PubMed] [Google Scholar]