| Abstract Detail
Systematics Section/ASPT Zimmerman, Erin [1], Herendeen, Patrick [2], Bruneau, Anne [1]. Floral evolution and systematics of the Dialiinae clade (Caesalpinioideae), a diverse lineage of tropical legumes. The Dialiinae s.l. clade is comprised of 17 genera and circa 85 species of trees and shrubs which are distributed pantropically, with species diversity centred in West Africa. The clade is noteworthy for its high level of floral morphological diversity, including variable symmetries and numerous instances of organ loss. It has not previously been possible to explore the evolution of these traits due to the lack of a well-resolved phylogenetic tree and a paucity of detailed morphological and ontogenetic studies. Here, we present the results of a combined morphological and molecular phylogenetic analysis of the Dialiinae. The morphological data are comprised of 135 floral and vegetative characters scored in 80 ingroup and four outgroup species, while the molecular data, obtained for over 50 species, are made up of sequencing results from both a nuclear floral development gene, Legume CYCLOIDEA, and a plastid gene region, rpS16. We also have complete or near-complete floral ontogenetic sequences for six species from three genera, including the largest genus, Dialium. Preliminary phylogenetic analyses suggest a trend of increasing sterility and decreasing floral organ numbers from basal to derived clades within the Dialiinae. Furthermore, the morphological diversity seen in mature flowers of this clade is also apparent during their ontogeny, which varies in timing and mode of initiation both among species and floral organ whorls. This lack of canalisation is typical of a number of early-diverging caesalpinioid clades. Broader Impacts:
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1 - University of Montreal, Institut de recherche en biologie végétale, 4101 rue Sherbrooke Est, Montreal, QC, H1X 2B2, Canada
2 - Chicago Botanic Garden, Senior Scientist, 1000 Lake Cook Road, Glencoe, IL, 60022, USA
Keywords:
Systematics
morphology
Floral development
Caesalpinioideae
Leguminosae.
Presentation Type: Oral Paper:Papers for Sections
Session: 11
Location: Magnolia/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 1:45 PM
Number: 11002
Abstract ID:393
Candidate for Awards:George R. Cooley Award |
