JAGGED controls Arabidopsis petal growth and shape by interacting with a divergent polarity field

Sauret-Güeto, Susanna, Schiessl, Katharina, Bangham, Andrew, Sablowski, Robert and Coen, Enrico (2013) JAGGED controls Arabidopsis petal growth and shape by interacting with a divergent polarity field. PLoS Biology, 11 (4).

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Abstract

A flowering plant generates many different organs such as leaves, petals, and stamens, each with a particular function and shape. These types of organ are thought to represent variations on a common underlying developmental program. However, it is unclear how this program is modulated under different selective constraints to generate the diversity of forms observed. Here we address this problem by analysing the development of Arabidopsis petals and comparing the results to models of leaf development. We show that petal development involves a divergent polarity field with growth rates perpendicular to local polarity increasing towards the distal end of the petal. The hypothesis is supported by the observed pattern of clones induced at various stages of development and by analysis of polarity markers, which show a divergent pattern. We also show that JAGGED (JAG) has a key role in promoting distal enhancement of growth rates and influences the extent of the divergent polarity field. Furthermore, we reveal links between the polarity field and auxin function: auxin-responsive markers such as DR5 have a broader distribution along the distal petal margin, consistent with the broad distal organiser of polarity, and PETAL LOSS (PTL), which has been implicated in the control of auxin dynamics during petal initiation, is directly repressed by JAG. By comparing these results with those from studies on leaf development, we show how simple modifications of an underlying developmental system may generate distinct forms, providing flexibility for the evolution of different organ functions.

Item Type: Article
Additional Information: © 2013 Sauret-Güeto et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Faculty \ School: Faculty of Science > School of Biological Sciences
Faculty of Science > School of Computing Sciences
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Depositing User: Pure Connector
Date Deposited: 09 Jul 2013 08:54
Last Modified: 21 Apr 2020 21:48
URI: https://ueaeprints.uea.ac.uk/id/eprint/42877
DOI: 10.1371/journal.pbio.1001550

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