Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
QUICK SEARCH:   [advanced]


     

Plant Physiology Preview
Published on September 17, 2008; 10.1104/pp.108.127639

This Article
Right arrow Full Text (Plant Physiology Preview (PDF))
Right arrow Supplemental Data
Right arrow All Versions of this Article:
148/3/1465    most recent
pp.108.127639v1
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 CrossRef
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Pouteau, S.
Right arrow Articles by Wilson, M.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Pouteau, S.
Right arrow Articles by Wilson, M.
Agricola
Right arrow Articles by Pouteau, S.
Right arrow Articles by Wilson, M.

Received August 5, 2008
Accepted September 10, 2008

Diversification of photoperiodic response patterns in a collection of early flowering mutants of Arabidopsis

Sylvie Pouteau *, Isabelle Carre , Valerie Gaudin , Valerie Ferret , Delphine Lefebvre , and Melanie Wilson

UR Biologie Cellulaire, INRA, RD 10, F78026 Versailles, France and Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK

* Corresponding author; email: Sylvie.Pouteau{at}versailles.inra.fr.

Many plant species exhibit seasonal variation of flowering time in response to daylength. Arabidopsis flowers earlier under long days (LD) than under short days (SD). This quantitative response to photoperiod is characterized by two parameters, the critical photoperiod (Pc) below which there is a delay in flowering, and the ceiling photoperiod (Pce) below which there is no further delay. Thus Pc and Pce define the thresholds beyond which maximum LD and SD responses are observed, respectively. We studied the quantitative response to photoperiod in 49 mutants selected for early flowering in SD. Nine of these mutants exhibited normal Pce and Pc, showing that their precocious phenotype was not linked to abnormal measurement of daylength. However, we observed a broad diversification in the patterns of quantitative responses in the other mutants. To identify factors involved in abnormal measurement of daylength, we analyzed the association of these various patterns with morphogenetic and rhythmic defects. A high proportion of mutants with altered Pce exhibited abnormal hypocotyl elongation in the dark and altered circadian periods of leaf movements. This suggested that the circadian clock and negative regulators of photomorphogenesis may contribute to the specification of SD responses. In contrast, altered Pc correlated with abnormal hypocotyl elongation in the light and reduced photosynthetic light-input requirements for bolting. This indicated that LD responses may be specified by positive elements of light-signal transduction pathways and by regulators of resource allocation. Furthermore, the frequency of circadian defects in mutants with normal photoperiodic responses suggested that the circadian clock may regulate the number of leaves independently of its effect on daylength perception.




This article has been cited by other articles:


Home page
 J Exp BotHome page
S. Pouteau and C. Albertini
The significance of bolting and floral transitions as indicators of reproductive phase change in Arabidopsis
J. Exp. Bot., August 1, 2009; 60(12): 3367 - 3377.
[Abstract] [Full Text] [PDF]

Home page
 J Exp BotHome page
Compiled by, F. Tooke, T. Chiurugwi, and N. Battey
Flowering Newsletter bibliography for 2008
J. Exp. Bot., June 23, 2009; (2009) erp154v1.
[Full Text] [PDF]

Home page
 Plant Cell PhysiolHome page
Y. Niwa, T. Yamashino, and T. Mizuno
The Circadian Clock Regulates the Photoperiodic Response of Hypocotyl Elongation through a Coincidence Mechanism in Arabidopsis thaliana
Plant Cell Physiol., April 1, 2009; 50(4): 838 - 854.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 2008 by the American Society of Plant Biologists