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MBE Advance Access originally published online on September 3, 2007
Molecular Biology and Evolution 2007 24(11):2474-2484; doi:10.1093/molbev/msm182
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© The Author 2007. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Research Articles

WOX Gene Phylogeny in Poaceae: A Comparative Approach Addressing Leaf and Embryo Development

Judith Nardmann*, Roman Zimmermann{dagger}, Diego Durantini*, Erhard Kranz{ddagger} and Wolfgang Werr*

* Institut für Entwicklungsbiologie, Universität zu Köln, Köln, Germany
{dagger} Zentrum für Molekularbiologie für Pflanzen, Universität Tübingen, Tübingen, Germany
{ddagger} Entwicklungsbiologie und Biotechnologie, Universität Hamburg Biozentrum Klein Flottbek und Botanischer Garten, Hamburg, Germany

E-mail: werr{at}uni-koeln.de.

Accepted for publication August 22, 2007.

The phylogeny based on the homeodomain (HD) amino acid sequence of the WOX (WUSCHEL-related homeobox gene family) was established in the 3 major radiations of the Poaceae family: Pooideae (Brachypodium distachyon), Bambusoideae (Oryza sativa), and Panicoideae (Zea mays). The genomes of all 3 grasses contain an ancient duplication in the WOX3 branch, and the cellular expression patterns in maize and rice indicate subfunctionalization of paralogues during leaf development, which may relate to the architecture of the grass leaf and the encircling of the stem. The use of maize WOX gene family members as molecular markers in maize embryo development for the first time allowed us to visualize cellular decisions in the maize proembryo, including specification of the shoot/root axis at an oblique angle to the apical–basal polarity of the zygote. All molecular marker data are compatible with the conclusion that the embryonic shoot/root axis comprises a discrete domain from early proembryo stages onward. Novel cell fates of the shoot and the root are acquired within this distinct morphogenic axis domain, which elongates and thus separates the shoot apical meristem and root apical meristem (RAM) anlagen in the maize embryo.

Key Words: WOX gene family • Poaceae • embryo patterning • leaf development

Neelima Sinha, Associate Editor


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