Skip Navigation

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Waaland, S. D.
Right arrow Articles by Waaland, J. R.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Waaland, S. D.
Right arrow Articles by Waaland, J. R.
Agricola
Right arrow Articles by Waaland, S. D.
Right arrow Articles by Waaland, J. R.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Plant and Cell Physiology, 1977, Vol. 18, No. 3 603-612
© 1977

Article

Phototropism in a red alga, Griffithsia pacifica

Susan D. Waaland, Willa Nehlsen1 and J. Robert Waaland

Department of Botany, University of Washington Seattle, Washington 98195, U.S.A.

In the red alga, Griffithsia pacifica, shoot portions of a plant are positively phototropic and rhizoids are negatively phototropic. We have studied the phototropic response of rhizoids which elongate by tip growth. For 45 min after the beginning of unilateral illumination a rhizoid grows straight, then phototropic curvature begins and continues rapidly until the rhizoid is growing away from the light. Curvature is 70–80% complete after 3 hr. If the unilateral stimulus is given for a short time (15 min), curvature again begins at 45 min. However, within an additional 30–45 min the rhizoid stops growing away from the light and wanders back towards its original direction of growth. Phototropism is elicited by light of wavelengths from 350 nm to 500 nm; in light of wavelengths above 550 nm, little, if any, response occurs.

1Present address: Division of Natural Sciences, University of California, Santa Cruz, California 95064, U.S.A.

(Received December 10, 1976; )
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer:
Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.