Abstract
Summary On the basis of a sluice model relating leaf water potential to the flow of water through the plant the following conclusions were drawn: 1.The bulk leaf water potential is not a relevant parameter with which to correlate stomatal movements.Leaf water potential is regarded as one output signal among others.The flow of water through the plant which is related to stomatal aperture provides another output signal. 2.Peristomatal transpiration is not the underlying process of a control mechanism, additional to the main system.Peristomatal transpiration can be regarded as the capacity of the guard cell to determine the sensitivity of its response to environmental perturbations. For these grounds a mechanistic model was designed in which peri stomatal transpiration has a central role.
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