A Water Potential Threshold for the Increase of Abscisic Acid in Leaves
Open Access
- 1 January 1974
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 53 (1) , 125-127
- https://doi.org/10.1104/pp.53.1.125
Abstract
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.Keywords
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