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Abstract Detail

Developmental and Structural Section

Bartholmes, Conny [1], Hutter, Sabrina [2], Pape, Sebastian [3], Gleissberg, Stefan [4].

Developmental control of leaf ad-/abaxial polarity and leaflet initiation in Eschscholzia californica.

Leaves grow as bifacial organs through the establishment of a primordial margin early in their development. In angiosperms, this primordial margin forms at the border between adaxial and abaxial domains, which are defined by gene expression patterns. In plants with dissected and compound leaves, these margins later on also play a role in segment formation. The genetic interactions involved in ad-/abaxial polarity are well characterized in Arabidopsis thaliana. However, this system does not lend itself to the study of leaf dissection, as genes typically involved in marginal segment formation are not expressed during serration formation in this species. Data from the dissected-leaved Lycopersicon esculentum indicate that some leaf polarity genes may also be involved in leaf dissection. This project aims to broaden the evolutionary understanding of angiosperm leaf polarity and how it relates to the regulation of leaf dissection. Our focus on the basal eudicot Eschscholzia californica, a bifacial and dissected-leaved taxon, allows us to take a comparative approach, taking into account data from both monocots and core eudicots. We are interested in (i) characterizing the establishment of leaf polarity in this species, (ii) determine which of the relevant genes play a role in leaf dissection. Here, we present preliminary data on Eschscholzia homologs of several leaf polarity genes and show that a YABBY-like gene exhibits prolonged expression during leaflet formation.

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1 - Ohio University, Department of Environmental and Plant Biology, 315 Porter Hall, Athens, OH, 45701, USA
2 - Johannes-Gutenberg-University, Institut fuer Spezielle Botanik, Bentzelweg 9a, Mainz, 55099, Germany
3 - Albrecht-von-Haller-Institut der Pflanzenwissenschaften, Abteilung Allgemeine und Entwicklungsphysiologie, Untere Klarspuele 2, Goettingen, 37073, Germany
4 - Ohio University, Environmental and Plant Biology, Porter Hall, Athens, Ohio, 45701, USA

leaf polarity
Leaf dissection

Presentation Type: Poster:Posters for Sections
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P48010
Abstract ID:1116

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