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 Buck, M. F.
Right arrow Articles by Vince-Prue, D.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Buck, M. F.
Right arrow Articles by Vince-Prue, D.
Agricola
Right arrow Articles by Buck, M. F.
Right arrow Articles by Vince-Prue, D.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Plant and Cell Physiology, 1985, Vol. 26, No. 7 1251-1261
© 1985

Article

Photomodulation of Stem Extension in Light-Grown Plants: Evidence for Two Reactions

M. F. Buck1,1 and Daphne Vince-Prue2

1Department of Horticulture, Shinfield Grange, University of Reading Shinfield, Berks, U.K.
2Physiology & Chemistry Division, Glasshouse Crops Research Institute Worthing Road, Littlehampton, West Sussex, BN17 6LP, U.K.

Internode elongation was measured in plants of Phaseolus vulgaris and Glycine max grown under 8 h photoperiods at 25 W m–2 in white fluorescent light, followed by light-extensions varying in quality, irradiance and duration. Two distinct responses to light were observed under these conditions.

A reduction in PFR/P increased elongation, but elongation was also modified by a second reaction in which internode length increased with increase in the duration and irradiance of the day-extension. This light-promoted response occurred in both red and blue light. In the PFR-inhibition response, light acted directly on the expanding internode. The light-promoted response, in contrast, required irradiation of the leaf.

The response to a short end-of-day exposure to far-red light progressively diminished as successive internodes expanded under the treatment, whereas the light-promoted response increased. The two processes appeared to interact and, in the later-expanding internodes, the effect of a reduction in PFR was greater under long day-extensions with mixed red and far-red light than in the end-of-day treatments.

1 Present address: British Telecom, Brunel House, 2 Fitzalan Road, Cardiff, U.K.

(Received February 15, 1985; Accepted July 15, 1985)
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.