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Photocontrol of Hook Opening in Cuscuta gronovii Willd.
Ronald F. Kujawski and F. H. Truscott
Vol. 53, No. 4 (Apr., 1974), pp. 610-614
Published by: American Society of Plant Biologists (ASPB)
Stable URL: http://www.jstor.org/stable/4263578
Page Count: 5
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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.
Plant Physiology © 1974 American Society of Plant Biologists (ASPB)