Abstract
The growth inhibitory activity of the epidioxide (II), a precursor in the synthesis of abscisic acid (ABA), has been confirmed with additional assay systems. Under physiological conditions the epidioxide is rearranged to give ABA and an isomer of ABA which has probably the structure V. This major product has very low, if any, biological activity. The biological activity of the epidioxide is explained by its partial conversion (about 20%) to ABA. The reaction rate was enhanced by heavy metal ions and decreased by EDTA. At pH 12.5, the decomposition of the epidioxide is slower than it is near neutrality and ABA is the predominant product. In the biological systems studied the activity of the epidioxide can be accounted for by nonenzymatic conversion to ABA.
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Selected References
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- Addicott F. T., Lyon J. L., Ohkuma K., Thiessen W. E., Carns H. R., Smith O. E., Cornforth J. W., Milborrow B. V., Ryback G., Wareing P. F. Abscisic acid: a new name for abscisin II (dormin). Science. 1968 Mar 29;159(3822):1493–1493. [PubMed] [Google Scholar]
- Nitsch J. P., Nitsch C. Studies on the Growth of Coleoptile and First Internode Sections. A New, Sensitive, Straight-Growth Test for Auxins. Plant Physiol. 1956 Mar;31(2):94–111. doi: 10.1104/pp.31.2.94. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ohkuma K., Lyon J. L., Addicott F. T., Smith O. E. Abscisin II, an Abscission-Accelerating Substance from Young Cotton Fruit. Science. 1963 Dec 20;142(3599):1592–1593. doi: 10.1126/science.142.3599.1592. [DOI] [PubMed] [Google Scholar]
- Sondheimer E., Galson E. C. Effects of Abscisin II and Other Plant Growth Substances on Germination of Seeds with Stratification Requirements. Plant Physiol. 1966 Oct;41(8):1397–1398. doi: 10.1104/pp.41.8.1397. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Varner J. E., Chandra G. R. HORMONAL CONTROL OF ENZYME SYNTHESIS IN BARLEY ENDOSPERM. Proc Natl Acad Sci U S A. 1964 Jul;52(1):100–106. doi: 10.1073/pnas.52.1.100. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Walton D. C. Germination of phaseolus vulgaris I. Resumption of axis growth. Plant Physiol. 1966 Feb;41(2):298–302. doi: 10.1104/pp.41.2.298. [DOI] [PMC free article] [PubMed] [Google Scholar]