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© 1979 Oxford University Press

RESEARCH-ARTICLE

Osmotically Induced Water Stress, Potassium Uptake, and Stomatal Aperture in Epidermal Strips of Vicia faba L.

SUSAN D. COOPER and WILLIAM COCKBURN

Botanical Laboratories, University of Leicester Leicester LEI 7RH, U.K.

Uptake of potassium ions, estimated microdensitometrically, and stomatal opening in isolated epidermal strips from Vicia faba L. cv. Aquadulce were both inhibited by incubation of the strips in solutions of low solute potential. The inhibition of potassium uptake was substantially reduced by preincubation of the strips in benzylaminopurine1 solution. The data are discussed in terms of the induction of abscisic acid synthesis by water stress in the epidermal strips and the antagonism to its effects by BAP.


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