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PLANT PHYSIOLOGY , Vol 109, Issue 3 803-811, Copyright © 1995 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
How Do Stomata Read Abscisic Acid Signals?
C. L. Trejo, A. L. Clephan and W. J. Davies
Division of Biological Sciences, Institute of Environmental and Biological Sciences, Lancaster University, Bailrigg, Lancaster LA1 4YQ, United Kingdom
When abscisic acid (ABA) was fed to isolated epidermis of Commelina
communis L., stomata showed marked sensitivity to concentrations of ABA
lower than those commonly found in the xylem sap of well-watered plants.
Stomata were also sensitive to the flux of hormone molecules across the
epidermal strip. Stomata in intact leaves of Phaseolus acutifolius were
much less sensitive to ABA delivered through the petiole than were stomata
in isolated epidermis, suggesting that mesophyll tissue and/or xylem must
substantially reduce the dose or activity of ABA received by guard cells.
Delivery of the hormone to the leaf was varied by changing transpiration
flux and/or concentration. Varying delivery by up to 7-fold by changing
transpiration rate had little effect on conductance. At a given delivery
rate, variation in concentration by 1 order of magnitude significantly
affected conductance at all but the highest concentration fed. The results
are discussed in terms of the control of stomatal behavior in the field,
where the delivery of ABA to the leaf will vary greatly as a function of
both the concentration of hormone in the xylem and the transpiration rate
of the plant.
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