The relative role of stomata in transpiration and assimilation
- 1 January 1971
- journal article
- Published by Springer Nature in Planta
- Vol. 97 (4), 325-336
- https://doi.org/10.1007/bf00390212
Abstract
The ways in which transpiration and assimilation depend on stomatal aperture are compared. It is shown that transpiration and assimilation are equally sensitive to change of stomatal aperture when the internal resistance to assimilation is equal to an effective resistance to evaporation which exists because of the coupling of heat and vapour exchanges between leaf and atmosphere. Generally the ratio of transpiration to assimilation changes with stomatal aperture in a manner which is determined by the relative magnitude of these resistances and on temperature. Some possible implications in relation to the optimal behaviour of stomata are discussed.Keywords
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