Evolutionary Developmental Biology (Evo-Devo)
Zhong, Jinshun .
Molecular evolution of flower symmetry patterning genes CYCLOIDEA2 within Lamiales.
CYCLOIDEA2 (CYC2) specifies flower symmetry and has undergone repeated duplications that are presumed to be important for the evolution of floral form and plant diversification. The CYC2-regulated pathway has been recruited multiple times in the evolution of the core eudicots. Our preliminary phylogenetic analysis within Lamiaceae shows that the family has two copies of CYC2. In addition, the duplication that gave rise to two CYC2 paralogs in the family is independent of the ones that occurred in Gesneriaceae and Plantaginaceae(Antirrhineae). This study focuses on (1)determining when the duplication of CYC2 occurred in Lamiales, (2) testing whether paralogs of CYC2 experienced any selective pressure, and (3) testing whether selection on the paralogs correlates with transformation in floral form.Preliminary phylogenetic analysis of CYC2 within the Lamiales shows that there are at least four independent duplication events within the order, in Oleaceae, Gesneriaceae, Plantaginaceae and other core Lamiales, respectively. The duplication after the divergence between Plantaginaceae and other core Lamiales correlates with the duplication events of two other flower patterning genes FLO/LFY and DEF/AP3 that indicated an ancient whole genome duplication event within the Lamiales.
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1 - Department Of Biology, Research BLDG 223, One University Blvd, Saint Louis, MO, 63121, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Lindell D/Chase Park Plaza
Date: Wednesday, July 13th, 2011
Time: 9:00 AM