The site of action of abscisic acid at the guard cell plasmalemma of Valerianella locusta

The site of action of abscisic acid at the guard cell plasmalemma of Valerianella locusta Abstract. Abscisic acid (ABA) is taken up by guard cells of isolated epidermata of Valerianella locusta only at low external pH values. At pH 8.0, when nearly all ABA molecules are present as the union of ABA (ABA−), no uptake can be observed. ABA‐dependent movement of stomata was tested at external pH values between 5.0 and 8.0. Independent of the external pH, ABA induced stomatal closure at all tested ABA concentrations. It is concluded that ABA need not be taken up into the cytosol of the guard cells in order to induce slomatal closure. The primary site of ABA action at the guard cell plasmalemma must be located either at the outer surface of the plasmalemma or at least be easily accessible from outside. ABA− is as effective as undissociated ABA (ABAH). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Cell & Environment Wiley

The site of action of abscisic acid at the guard cell plasmalemma of Valerianella locusta

Plant Cell & Environment, Volume 6 (5) – Jul 1, 1983

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Publisher
Wiley
Copyright
Copyright © 1983 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0140-7791
eISSN
1365-3040
D.O.I.
10.1111/j.1365-3040.1983.tb01276.x
Publisher site
See Article on Publisher Site

Abstract

Abstract. Abscisic acid (ABA) is taken up by guard cells of isolated epidermata of Valerianella locusta only at low external pH values. At pH 8.0, when nearly all ABA molecules are present as the union of ABA (ABA−), no uptake can be observed. ABA‐dependent movement of stomata was tested at external pH values between 5.0 and 8.0. Independent of the external pH, ABA induced stomatal closure at all tested ABA concentrations. It is concluded that ABA need not be taken up into the cytosol of the guard cells in order to induce slomatal closure. The primary site of ABA action at the guard cell plasmalemma must be located either at the outer surface of the plasmalemma or at least be easily accessible from outside. ABA− is as effective as undissociated ABA (ABAH).

Journal

Plant Cell & EnvironmentWiley

Published: Jul 1, 1983

References

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