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Abstract Detail



Evolutionary Developmental Biology (Evo-Devo)

Zhong, Jinshun [1], Kellogg, Elizabeth [2].

The evolution of expression and co-option of CYC-RAD in shaping floral zygomorphy.

Floral zygomorphy is thought to have played an important role in the diversification of angiosperm flowers. Studies in distantly related eudicot lineages have indicated that CYCLOIDEA (CYC)-like genes have been recruited repeatedly for patterning floral zygomorphy and its persistent expression during the later developmental stages is crucial to establish the adaxial-abaxial asymmetry. In addition, the co-option of CYC-RADIALIS (RAD) has also shown to be important for the origin of floral zygomorphy. However, how persistent expression and co-option of CYC-RAD have evolved over the course of emergence of floral zygomorphy is still poorly known. Lamiales, with an early origin of floral zygomorphy and recurring actinomorphy in the core clade, are a rich system and have emerged as model organisms for floral patterning study. Here we examined the expression of CYC-like and RAD-like genes in early diverging and higher core Lamiales. The results indicated the persistent expression of CYC-like in petal lobes during later developmental stages has evolved before the emergence of floral zygomorphy, while the evolution of co-option of CYC-RAD in establishing floral adaxial-abaxial asymmetry may be correlated with the multiple independent duplications of CYC-like and the emergence of floral zygomorphy.

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1 - Department of Biology, Research BLDG 223, One University Blvd, Saint Louis, MO, 63121, USA
2 - University of Missouri - St. Louis, Department of Biology, One University Boulevard, St. Louis, MO, 63121-4499, USA, 314/516-6217

Keywords:
floral symmetry
CYC-RAD
Lamiales.

Presentation Type: Oral Paper:Papers for Topics
Session: 47
Location: Jasperwood/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 4:00 PM
Number: 47010
Abstract ID:808
Candidate for Awards:Katherine Esau Award


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