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Plant Physiology 50:687-693 (1972)
© 1972 American Society of Plant Biologists

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Articles

Phytochrome-mediated Electric Potential Changes in Oat Seedlings 1

Ian A. Newman2 and Winslow R. Briggs

a Biological Laboratories, Harvard University, 16 Divinity Avenue, Cambridge, Massachusetts 02138

Brief exposures to red light induce far red-reversible changes of 5 to 10 millivolts magnitude in the upper 1 centimeter of etiolated Avena coleoptiles. The changes begin within 15 seconds of the start of illumination and they continue for at least 12 minutes. The changes were measured using a flowing solution of 10 mM KCl to contact the surface of the coleoptile. A dark-grown coleoptile shows no change in response to far red light unless it first receives red light treatment. The second of two red light exposures is ineffective without an intervening far red treatment. Some characterization of these electric responses to light is presented.

2 Present address: Physics Department, University of Tasmania, G.P.O. Box 252 C, Hobart, Australia 7001.

1 This work was supported by Maria Moors Cabot Foundation of Harvard University and National Science Foundation Grant GB 15572 to Winslow R. Briggs.




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Copyright © 1972 by the American Society of Plant Biologists