Evolutionary Developmental Biology (Evo-Devo)
Patchell, Melanie , Bolton, Matlock , Mankowski, Peter , Hall, Jocelyn .
Diversity of early floral development in zygomorphic flowers of Cleomaceae reveal phylogenetic pattern.
Comparisons of floral symmetry have important implications for understanding ecological, evolutionary, and molecular mechanisms driving the diversification of angiosperms. However, many investigations of floral symmetry only consider mature morphology and do not incorporate the potential for more diverse patterns of early development. Examination of symmetry in Cleomaceae provides an opportunity to compare monosymmetric (zygomorphic) flowers with the polysymmetric (specifically disymmetric) flowers generated by its well-characterized sister family, Brassicaceae. Here we lay the groundwork for future investigations of symmetry in Cleomaceae and comparisons with Brassicaceae by examining early development in a phylogenetic context. A phylogeny was reconstructed based on plastid DNA variation and a detailed developmental series was generated for four species selected from a breadth of well-supported clades. Early development was surveyed in an additional six species. Although all flowers were monosymmetric due to upward curvature of the petal bases at maturity, two distinct patterns of early development were identified: early monosymmetry, and early disymmetry. Enlarged abaxial sepal and petals that remain small in the bud characterize species exhibiting early monosymmetry, while equally sized sepals and petals throughout development characterize species exhibiting early disymmetry. Consequently, early development is an important aspect of floral diversity in Cleomaceae.
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1 - University of Alberta, Biological Sciences, CW 405 Biological Sciences Building, Edmonton, AB, T6G 2E9, Canada
2 - University of Alberta, Department of Biological Sciences, Room: B 608, Biological Sciences Bldg., Edmonton, Alberta, T6G 2E9, Canada
Presentation Type: Poster:Posters for Topics
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM