Abstract
Hydraulic signals are ubiquitous in plants. They can pass throughout the hydraulic continuum of the plant very quickly, especially in the xylem. They may permit integration of whole-plant responses. Their effect on stomata could be important; change in the environment (and water potential) of one leaf will be transmitted hydraulically and will affect the aperture of stomata throughout the shoot, by a hydropassive mechanism. Wound-induced hydraulic signals are a special case. The basipetal mass flows associated with these signals can sweep elicitors from wound sites to the remainder of the plant at rates of about 10 mms
-1
. This could be the mechanism by which rapid, whole-plant defence responses to localized attack are coordinated.
Subject
General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology
Reference3 articles.
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2. Bowling D .J.F. 1989 A new porom eter based on the electrical current produced by guard cells. 1407-1411.
3. exp. Bot. 40
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