Exogenously applied amino acids and stomatal aperture


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Commelina communis

Reversal of Stomatal Closure in Commelina communis L. by Exogenous Amino Acids and Their Interaction with Stress and Abscisic Acid.

by Thakur P. S., Thakur A., Rai V. K. (1988)

Department of Bio-Sciences, H. P. University Shimla, India

in  Biochemie und Physiologie der Pflanzen, 1988.183 (1), 37 – 43 – https://doi.org/10.1016/S0015-3796(88)80066-0 –

CrossRef. –



Exogenously applied L-alanine, L-glutamic acid, L-lysine, L-proline, L-arginine and L-methionine, all promoted stomatal opening in Commelina communis L. epidermal peels.

All of these aminoacids tested, irrespective of their individual effectiveness antagonized the closure of stomata induced either by different stress levels or abscisic acid.

Stomata responded variably to imposed stress where aperture size declined from 19.7 µm in control to 7.6, µrn by – 0.808 MPa upto 6 h of treatment. The closure was even more at higher osmotic potential (i.e. −1.10 — −1.61 MPa). ABA (between 10-9 to 10-5 mol m-3) reduced stomatal aperture significantly.

The relevance of amino acids in relation to stomatal aperture is discussed.


Published by

Willem Van Cotthem

Honorary Professor of Botany, University of Ghent (Belgium). Scientific Consultant for Desertification and Sustainable Development.

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