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Science 19 November 1971:
Vol. 174. no. 4011, pp. 829 - 831
DOI: 10.1126/science.174.4011.829
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Articles

Asymmetry, Its Importance to the Action and Metabolism of Abscisic Acid

E. Sondheimer 1, E. C. Galson 1, Y. P. Chang 1, and D. C. Walton 1

1 Department of Chemistry, State University of New York, College of Forestry at Syracuse University, Syracuse 13210

Unlabeled and 14C-labeled enantiomorphs of abscisic acid (ABA) were obtained through acetylcellulose chromatography and tested as inducers of abscission, as inhibitors of seed germination, and as antagonists of gibberellic acid-induced synthesis and release of agr-amylase. The activity of the R isomer was either equal to or less than that of the naturally occurring S form. Greatest differences were in the inhibition of root-related growth. In excised beam axes, although uptake of S-[14C]ABA is faster, the internal concentration of R-ABA is higher because of faster conversion of S-ABA to inactive metabolic products. In axes a reversal in chirality is less important to the physiological action of ABA than to its metabolism.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)