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Abstract Detail


Evolutionary Developmental Biology (Evo-Devo)

Ambrose, Barbara [1].

Duplication and diversification of key developmental regulators during land plant evolution.

Key morphological innovations have served as diagnostic features of major land plant groups. These morphological innovations include embryos, dichotomous branching, vasculature, sporophyte dominant life phase, seeds and flowers. Molecular genetic studies in plant model organisms such as Arabidopsis thaliana have shown that developmental regulators such as the MADS-box family of transcription factors specify some of these morphological innovations. The MADS-box proteins are best known for their role in the ABC model of floral organ identity and their importance in specifying an important morphological innovation, the flower. MADS-box proteins are also important for flowering time, fruit development, endosperm development and seed development. The recent completion of genome sequences for Physcomitrella patens and Selaginella moellendorffii provide the data for a broad comparative analysis of the duplication and diversification of MADS-box genes across the land plants. Physcomitrella patens, a bryophyte, has a gametophyte dominant life phase while Selaginella moellendorffii, a lycophyte, has a sporophyte dominant life phase, vasculature and exhibits heterospory. We will discuss our analyses of MADS-box genes across the land plants and the role MADS-box genes in the evolution and development of land plants.


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1 - The New York Botanical Garden, 200th St. and Southern Blvd., Bronx, NY, 10458, USA

Keywords:
evolution
development
mads-box
Selaginella moellendorffii
Physcomitrella patens.

Presentation Type: Oral Paper:Papers for Topics
Session: 62
Location: Cottonwood A/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 11:00 AM
Number: 62004
Abstract ID:611


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