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JXB Advance Access published online on June 5, 2009
Journal of Experimental Botany, doi:10.1093/jxb/erp173
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© The Author [2009]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

The significance of bolting and floral transitions as indicators of reproductive phase change in Arabidopsis

Sylvie Pouteau* and Catherine Albertini {dagger}

UR Biologie Cellulaire, INRA, RD 10, F-78026 Versailles, France

* To whom correspondence should be addressed. E-mail: Sylvie.Pouteau{at}versailles.inra.fr

Reproductive phase change in Arabidopsis thaliana is characterized by the floral transition (initiation of the first flower) and the bolting transition (elongation of the first internode). Here, the relationship between these transitions is examined by comparing variation in cauline and total leaf numbers in wild-type plants and 49 early-flowering mutants under a wide range of photoperiods. The timing of these transitions was also evaluated by subjecting wild-type plants to photoperiodic perturbations at different developmental stages. Coupling between the bolting and floral transitions was altered in the wild type under non-optimal flowering conditions but could be restored by optimal conditions that activate the progression to flowering, including continuous light treatments and early flowering mutations. Under non-optimal photoperiodic conditions, the floral node was specified a few days before the bolting node. Altered definitions of long days for the cauline and total leaf responses were frequently coupled in early flowering mutants and were associated with similar photomorphogenetic defects. By contrast, altered definitions of short days were often opposite for the two leaf responses and were associated with different photomorphogenetic and circadian phenotypes. It is concluded that the bolting and floral transitions are regulated by different signalling pathways under non-optimal conditions and that phase change is a multidimensional process. This paper also proposes that, in contrast to the floral transition which is contingent on different factors, the bolting transition may be a robust indicator of reproductive phase change, especially when the progression to flowering is not optimal.

Key words: Arabidopsis, bolting, ceiling photoperiod, critical photoperiod, daylength, early flowering mutants, flowering time, phase change

{dagger} Present address: UR Biologie de la Rhizosphère, INRA, RD 10, F-78026 Versailles, France.

Received 26 March 2009; Revised 30 April 2009 Accepted 5 May 2009


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