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Plant Physiology 89:493-497 (1989)
© 1989 American Society of Plant Biologists

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Development and Growth Regulation

Evidence for a Phytochrome-Mediated Phototropism in Etiolated Pea Seedlings 1

Karen Parker, Tobias I. Baskin2 and Winslow R. Briggs

Department of Plant Biology, Carnegie Institution of Washington, Stanford, California 94305

Entirely etiolated pea seedlings (Pisum sativum, L. cv Alaska) were tested for a phototropic response to short pulses of unilateral blue light. They responded with small curvatures resembling in fluence-dependence and kinetics of development a phytochrome-mediated phototropic response previously described in maize mesocotyls. Irradiations from above with saturating red or far-red light, either immediately before or after the unilateral phototropic stimulus, strongly reduced or eliminated subsequent positive phototropic curvature. Only blue light from above, however, entirely eliminated curvature at all fluences of stimulus. It is concluded that the phototropism is primarily a result of phytochrome action.

2 Present address: Department of Botany, University of California, Berkeley, California 94720 USA

1 CIW-DPB publication number 1013.




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Copyright © 1989 by the American Society of Plant Biologists