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Abstract Detail

Evolutionary Developmental Biology (Evo-Devo)

Ferraro, Ben [1], Malcomber, Simon [2].

Examining the roles of CYCLOIDEA,RADIALIS and DIVARICATA in driving the evolution of flower shape inCalifornian Mimulus species (Phyrmaceae).

The evolution of radially symmetrical (actinomorphic) flowers from bilaterally symmetrical (zygomorphic) ancestors (and vice versa) has occurred repeatedly in flowering plants, but is particularly common within the Lamiales. Studies in the zygomorphic model species Antirrhinum majus (snapdragon) show the TCP transcription factor CYCLOIDEA (CYC), along with two MYB transcription factors RADIALIS (RAD) and DIVARICATA (DIV) play major roles in regulating flower shape. Two mechanisms are reported to lead to actinomorphic flowers in snapdragon: 1) Expansion of the CYC and RAD expression domains and contraction of the DIV expression domain leads to dorsalized (adaxialized) actinomorphic flowers, whereas 2) Contraction of the CYC and RAD expression domains and expansion of the DIV leads to ventralized (abaxialized) actinomorphic flowers. In this study we examine the roles played by CYC, DIV and RAD in the evolution of actinomorphic flowers in Mimulus. Mimulus is an ancestrally zygomorphic genus but phylogenetic analyses indicate that actinomorphy has evolved twice independently in the Californian native species M. pictus and M. mohaviensis. Using a combination of RT-PCR and mRNA in situ hybridization we infer the expression profiles of CYC, DIV and RAD in developing flowers of the actinomorphic M. pictus and zygomorphic M. guttatus to provide insights into the mechanisms driving the evolution of flower shape within the genus.

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1 - CSU- Long Beach, 1250 Bellflower Blvd., Long Beach, CA, 90840, USA
2 - CSU - Long Beach, 1250 Bellflower Blvd, Long Beach, CA, 90840, USA

none specified

Presentation Type: Poster:Posters for Topics
Session: P
Location: Battelle South/Convention Center
Date: Monday, July 9th, 2012
Time: 5:30 PM
Number: PEV013
Abstract ID:607

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