Stomatal oscillations, transpiration, assimilation and water‐use efficiency


Role of stomatal oscillations on transpiration, assimilation and water‐use efficiency of plants.

by Upadhyaya S. K., Rand R. H., Cooke J. R. (1988)

Upadhyaya S. K., University of California, Davis, USA

Rand R. H., Cornell University, Ithaca, USA

Cooke J. R., Cornell University, Ithaca, USA                                                                                                                                                                                                                                                           in Ecological Modelling 41,27–40. –

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The objective of this study was to evaluate the average transpiration rate and CO2 assimilation rate and water-use efficiency during steady-state limit cycle oscillations (time varying cyclic changes) in stomatal pore width both for a hydropassive feedback loop model and for a comprehensive model with both hydropassive and CO2 feedback effects.

The results were compared with the corresponding values for the non-time varying pore width (pore width corresponding to a theoretically predicted unstable focus).

The hydropassive model predicts that the oscillations of stomata under dry ambient conditions conserve moisture. The comprehensive model which incorporates CO2feedback loop suggests that such oscillations not only reduce transpiration rate, but also improve water-use efficiency.


Published by

Willem Van Cotthem

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

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