Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 49:722-724 (1972)
© 1972 American Society of Plant Biologists

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Articles

Some Counteractive Effects of Antitranspirants 1

D. C. Davenport, M. A. Fisher and R. M. Hagan

a Department of Water Science and Engineering, University of California, Davis, California 95616

Some previously unexpected effects of antitranspirants on stomata and plant growth are described, and their implications are discussed. Antitranspirant films increase the resistance to diffusion of water vapor from stomata. This increases leaf water potential and results in wider stomatal apertures immediately under the film, as well as on those parts of a partially treated leaf which are not covered by the film. Antitranspirants are expected to curtail growth via reduced photosynthesis. However, by increasing plant water potential they can enhance the growth of fruits and shoots.

1 This study was supported by funds provided by the United States Department of the Interior, Office of Water Resources Research (as authorized under the Water Resources Research Act of 1964), and by the University of California, Water Resources Center.






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