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. 1974 Jan;53(1):125-7.
doi: 10.1104/pp.53.1.125.

A water potential threshold for the increase of abscisic Acid in leaves

T J Zabadal  1
Affiliations

A water potential threshold for the increase of abscisic Acid in leaves

T J Zabadal. Plant Physiol. 1974 Jan.

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.

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References

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