Abstract
One of the questions which plant physiologists ask about a hormone is how its cellular levels are regulated. The concentration of a hormone, or of any other cellular constituent, will depend on its rate of synthesis and metabolism and on its rate of import into and export from the cell. Abscisic acid (ABA, Fig. 1) is a particularly interesting hormone with regard to the regulation of its levels, since they rise and fall dramatically in several kinds of tissues in response to environmental and developmental changes. When leaves of mesophytic plants are water stressed, ABA levels can rise from 10-to 50-fold within 4 to 8 hours, apparently due to a greatly increased rate of biosynthesis. When the plants are rewatered, the ABA levels drop to pre-stress levels within 4 to 8 hours. The drop in concentration is due to a reduced biosynthetic rate, a vigorous metabolism and possibly export from the leaves. In developing seeds of various plants, ABA levels can rise a hundred-fold within a few days and then decline to low levels as the seeds mature and dessicate. Synthesis and metabolism, as well as import, are involved in changing the ABA levels. Dormant buds and seeds of woody plants accumulate high levels of ABA which then decrease when the tissues are exposed to low temperatures. A combination of synthesis, metabolism, import and export are probably involved in determining the ABA levels in these issues.
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© 1987 Martinus Nijhoff Publishers, Dordrecht
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Walton, D.C. (1987). Abscisic Acid Biosynthesis and Metabolism. In: Davies, P.J. (eds) Plant Hormones and their Role in Plant Growth and Development. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3585-3_7
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DOI: https://doi.org/10.1007/978-94-009-3585-3_7
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