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Plant Physiology 53:610-614 (1974)
© 1974 American Society of Plant Biologists

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Photocontrol of Hook Opening in Cuscuta gronovii Willd 1

Ronald F. Kujawski2 and F. H. Truscott

a Department of Biological Sciences, State University of New York at Albany, Albany, New York 12222

Hook opening in seedlings of Cuscuta gronovii Willd. occurred only after prolonged exposures to blue, red, or far red light. Prolonged far red exposure was less effective than prolonged exposure to red or blue light. Brief far red irradiation inhibited the inductive effect of red light. The far red inhibition was in turn reversed by brief red irradiation. These effects suggest the involvement of two photosystems in the control of hook opening in Cuscuta gronovii Willd.: a phytochrome-mediated system and a separate high energy requirement.

2 Present address: Simon's Rock College, Great Barrington, Mass. 01230.

1 This research was supported by Grant GM02014 from the National Institutes of Health.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1974 by the American Society of Plant Biologists