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. 1971 Nov 19;174(4011):829-31.
doi: 10.1126/science.174.4011.829.

Asymmetry, its importance to the action and metabolism of abscisic Acid

E Sondheimer, E C Galson, Y P Chang, D C Walton

Asymmetry, its importance to the action and metabolism of abscisic Acid

E Sondheimer et al. Science. .

Abstract

Unlabeled and (14)C-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 alpha-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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