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Abstract Detail

Developmental and Structural Section

Pabon Mora, Natalia [1], Litt, Amy [2].

Before the gene duplication event: addressing functional evolution of the APETALA1/FRUITFULL gene lineage in non-core eudicots.

Duplication events in gene lineages can potentially result in sequence variation and new protein structures subject to novel regulatory mechanisms. This seems to be the case in the APETALA1/FRUITFULL gene lineage. This gene lineage as other MADS-box gene lineages underwent a major duplication at the base of the core eudicots, resulting in the euFUL and the euAP1 clades. Another duplication occurred within the Brassicaceae resulting in a specific gene complement in Arabidopsis. All evidence regarding expression data, functional data and protein structure suggests that multiple copies in Arabidopsis may function differently from orthologs in other core eudicots, and that the role of APETALA1 as an A function gene (sepal and petal identity) could be a Brassicaceae-specific phenomena. It also suggests that euAP1 genes are different from euFUL genes, their core eudicot paralogs, and from FUL-like genes, their pre-duplication homologs. Little is known about FUL-like genes. They are upregulated during vernalization and seem to play a role in proper floral transition in temperate grasses. However the endogenous roles of FUL-like genes in basal eudicots and basal angiosperms are virtually unknown. We have selected Aristolochia fimbriata (Piperales), Aquilegia coerulea and Papaver somniferum (Ranunculales), all non core eudicots, in order to address the putative role of FUL-like genes and in turn the ancestral role of the gene lineage. FUL-like genes in Aristolochia and Papaver are expressed broadly in leaves, and in all floral organs, but not in roots or cotyledons. In Aquilegia however, while AqFL1 is expressed in leaves and all floral organs except stamens, AqFL2 is restricted to carpels and fruits. Effects of the downregulation of each paralog and both FUL-like copies in Aquilegia and Papaver are being studied. Preliminary results suggest that at least one FUL-like gene in Papaver is involved in proper transition from vegetative to reproductive meristems.

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1 - Graduate Center CUNY/ New York Botanical Garden, Plant Sciences, 200th St and Southern Blvd, Plant Research Laboratory, Bronx, NY, 10458, USA
2 - The New York Botanical Garden, 200th St and Southern Boulevard, Bronx, NY, 10458-5126, USA

non-core eudicots
gene duplication.

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 51
Location: Maybird/Cliff Lodge - Level C
Date: Tuesday, July 28th, 2009
Time: 4:30 PM
Number: 51007
Abstract ID:608