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 NAKASHIMA, H.
Right arrow Search for Related Content
PubMed
Right arrow Articles by NAKASHIMA, H.
Agricola
Right arrow Articles by NAKASHIMA, H.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Plant and Cell Physiology, 1966, Vol. 7, No. 1 11-24
© 1966

Article

THE RHYTHMICAL CHANGE IN SENSITIVITY OF A LONG-DAY DUCKWEED, LEMNA GIBBA G3, TO DARK-BREAK

HIDEAKI NAKASHIMA

Biological Institute, Nagoya University Nagoya

1. Effect of varied lengths of darkness given before continuous illumination, and that of dark-break of continuous light as a function of the time of its application, on the flower formation in a long-day duckweed, Lemna gibba G3, were studied.

The results obtained suggested a rhythmic change in sensitivity to darkness, i.e., a cycle of 36 hr-period consisting of 12 hr of sensitivity and the following 24 hr of insensitivity. The inhibition by darkness (12–36 hr) given before the start of, or by dark-break (12, 24 hr) inserted in, the induction period involved an extension of the induction period, but not a slow-down of the rate of flower formation. The dark-break given after the induction period, however, suppressed the rate of flower production in proportion to the length of the darkness.

2. The inhibition of flowering by darkness given in the darksensitive phase was cancelled by a relatively brief light period inserted in the darkness.

3. Relation between the rhythm and the length of induction period was discussed.

(Received August 13, 1965; )
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.