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JXB Advance Access originally published online on February 26, 2009
Journal of Experimental Botany 2009 60(5):1493-1502; doi:10.1093/jxb/erp031
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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

This article appears in the following Journal of Experimental Botany issue: Special Issue: Perspectives on Plant Development [View the issue table of contents]

REVIEW-ARTICLE

Meristematic sculpting in fruit development

Thomas Girin *, Karim Sorefan * and Lars Østergaard{dagger}

Crop Genetics Department, John Innes Centre, Colney Lane, Norwich NR4 7UH, UK

{dagger} To whom correspondence should be addressed: lars.ostergaard{at}bbsrc.ac.uk

The diversity of shape in life is astounding, and this is particularly vivid when the varied forms observed in our fruit bowls are examined. How some of the tissues of the Arabidopsis fruit are moulded is starting to be understood, revealing how plants may sculpt plant form by modulating the degree of meristematic properties. In this fruit the KNOX I and BLH meristem identity genes promote medial tissue proliferation by maintaining these tissues in a ‘quasi-meristematic’ fate. The action of these genes is opposed by ASYMMETRIC LEAVES activity that promotes valve formation together with JAGGED/FILAMENTOUS FLOWER and FRUITFULL activities. This is reminiscent of the function of these genes in the shoot apical meristem and in leaf development. In this review, the aim is to present the medial tissues of the Arabidopsis fruit as a modified meristem and extrapolate our knowledge from other plant organs to fruit development.

Key words: ASYMMETRIC LEAVES, REPLUMLESS/BELLRINGER, fruit development, gynoecium, JAG/FIL, KNOX I, quasi-meristem, replum, SAM, tissue patterning

* These authors contributed equally to this work.

Received 9 December 2008; Revised 22 January 2009 Accepted 26 January 2009


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