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

Thomas J. Zabadal | Zendy

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

Author(s) -

Thomas J. Zabadal

Publication year - 1974

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.53.1.125

Subject(s) - abscisic acid , dehydration , botany , ambrosia artemisiifolia , biology , drought resistance , horticulture , chemistry , biochemistry , allergy , ragweed , gene , immunology

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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