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JXB Advance Access published online on February 10, 2007
Journal of Experimental Botany, doi:10.1093/jxb/erm002
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© The Author [2007]. 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

FLOWERING NEWSLETTER REVIEW

Flowering and determinacy in Arabidopsis

Robert Sablowski*

Cell and Developmental Biology, John Innes Centre, Norwich NR4 7UH, UK

* E-mail: Robert.sablowski{at}bbsrc.ac.uk

Meristems provide new cells to produce organs throughout the life of a plant, and their continuous activity depends on regulatory genes that balance the proliferation of meristem cells with their recruitment to organogenesis. During flower development, this balance is shifted towards organogenesis, causing the meristem to terminate after producing a genetically determined number of organs. In Arabidopsis, WUSCHEL (WUS) specifies the self-renewing cells at the core of the shoot meristems and is a key target in the control of meristem stability. The development of a determinate floral meristem is initiated by APETALA1/CAULIFLOWER (AP1/CAL) and LEAFY (LFY). The latter activates AGAMOUS (AG), partly in co-operation with WUS. AG then directs the development of the innermost floral organs and at the same time antagonizes WUS to terminate the meristem, although the mechanism of WUS repression remains unknown. All these genes participate in a series of regulatory feedback loops that maintain stable expression patterns or promote sharp developmental transitions. Although the regulators of meristem maintenance and determinacy in Arabidopsis are widely conserved, their interactions may vary in other species.

Key words: AGAMOUS, determinacy, flower development, shoot meristem, WUSCHEL

Received 1 November 2006; Revised 11 December 2006 Accepted 5 January 2007


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