Plant Physiol. Drug Metab Dispos
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Plant Physiology 53:125-127 (1974)
© 1974 American Society of Plant Biologists

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A Water Potential Threshold for the Increase of Abscisic Acid in Leaves 1

Thomas J. Zabadal2

a Section of Ecology and Systematics, Langmuir Laboratory, Cornell University, Ithaca, New York 14850

A relationship between abscisic acid concentration and leaf water status is reported. Water potentials were measured in leaves of Ambrosia artemisiifolia L. and Ambrosia trifida L. throughout a period of dehydration of intact plants. Tissues from the same leaves were analyzed for abscisic acid. For both species, abscisic acid began to increase in a critical water potential range (–10 to –12 atmospheres). These data suggest a threshold water potential that stimulates abscisic acid synthesis. The data support the hypothesis that a small change in water potential could affect stomatal resistance to water loss by means of a very sensitive chemical feedback control mechanism.

2 Present address: New York State Cooperative Extension, Penn Yan, N. Y. 14527.

1 This research was supported in part by a National Science Foundation Grant GB-25590 to Lee N. Miller, and a Cornell Research grant to the author.




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Copyright © 1974 by the American Society of Plant Biologists