Abstract
Summary Stomatal responses to soil drying can be classified as hydraulic and nonhydraulic. In this paper, it is argued that the so-called nonhydraulic responses are much more important than had previously been thought to be the case. One type of nonhydraulic response involves the production in roots of chemical regulators of stomatal behaviour. These regulators are transferred to the shoots in the transpiration stream. The case is made for the involvement of several different compounds in root to shoot signalling and it is concluded that both promoters and inhibitors of stomatal opening may operate in different plants. It is clear that abscisic acid may play a central role in the control of stomatal behaviour of some plants.
Published Version
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