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Photocontrol of Hook Opening in Cuscuta gronovii Willd.

Ronald F. Kujawski and F. H. Truscott
Plant Physiology
Vol. 53, No. 4 (Apr., 1974), pp. 610-614
Stable URL: http://www.jstor.org/stable/4263578
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Photocontrol of Hook Opening in Cuscuta gronovii Willd.
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Abstract

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.

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