spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

This Article
Right arrow Full Text (PDF)
Right arrow References
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 Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by McDaniel, C. N.
Right arrow Articles by Hartnett, L. K.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by McDaniel, C. N.
Right arrow Articles by Hartnett, L. K.

Development, Vol 122, Issue 11 3661-3668, Copyright © 1996 by Company of Biologists

JOURNAL ARTICLES

Flowering as metamorphosis: two sequential signals regulate floral initiation in Lolium temulentum

CN McDaniel and LK Hartnett
Department of Biology, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA. mcdanc@rpi.edu

We investigated floral initiation in the long-day monocot Lolium temulentum, strain Ceres, by culturing apices explanted from photoperiodically induced plants at various times after one inductive long day onto medium with, and without, gibberellin. Apices cultured on the first day after the inductive long day usually required gibberellin in the medium to initiate floral morphogenesis while apices explanted on the second day after induction did not require gibberellin. Apices explanted on the first day after induction onto medium without gibberellin grew vegetatively for many days but a several-day exposure to culture medium with gibberellin at any time caused most apices to initiate floral morphogenesis. The gibberellin synthesis inhibitor, ancymidol, when applied to plants before apex excision and when present in the culture medium reduced floral initiation by more than 50% in the absence of added gibberellin in the medium, but it was ineffective in the presence of gibberellin. These results indicated that floral initiation in photoperiodically induced plants resulted from two signals acting at the apex. The first signal induced the apex into a florally determined state and then the second signal, gibberellin, elicited expression of the florally determined state. Leaf removal and culture of apices from plants previously treated with gibberellin provided evidence that the leaf-applied gibberellin did not itself act on the apex to cause floral determination or initiation. Rather, the exogenous gibberellin appeared to stimulate the production of a signal in the leaves that then led to floral initiation.


This article has been cited by other articles:


Home page
 Plant Physiol.Home page
T. Sakamoto, M. Kobayashi, H. Itoh, A. Tagiri, T. Kayano, H. Tanaka, S. Iwahori, and M. Matsuoka
Expression of a Gibberellin 2-Oxidase Gene around the Shoot Apex Is Related to Phase Transition in Rice
Plant Physiology, March 1, 2001; 125(3): 1508 - 1516.
[Abstract] [Full Text]

Home page
 Plant CellHome page
Y. Y. Levy and C. Dean
The Transition to Flowering
PLANT CELL, December 1, 1998; 10(12): 1973 - 1990.
[Full Text]


© The Company of Biologists Ltd 1996