A 10 -4 M solution of (±) abscisic acid (ABA) was applied to the leaves of five plants each of three species of woody angiosperms. Transpiration of treated plants decreased, presumably as a result of stomatal closure. Water loss of Acer saccharum seedlings was reduced more rapidly than water loss of Fraxinus americana seedlings, but less rapidly than that of Citrus mitis . In Fraxinus , one ABA application reduced transpiration for 21 days. Applied ABA acted as a nontoxic metabolic antitranspirant. Transpiration of Citrus mitis and Acer saccharum was more sensitive to decreases in plant water potential than was transpiration of Fraxinus americana . Forest Sci. 21:191-195.
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Davies et al. (1975) studied this question.