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Abstract Detail

Systematics Section

Neubig, Kurt [1], Blanchard, Orland [2], Schwartz, Emily [1], Mcdaniel, Stuart [1].

Molecular phylogenetics of Kosteletzkya (Malvaceae, Hibisceae) reveals multiple polyploid speciation events.

Kosteletzkya (Malvaceae) is a genus ofover 20 species found in the New World, Africa, Madagascar, and southeast Asia. We generated both nuclear (CesA1 & A1341) and plastid (matK,trnL-F, rpl32-trnL, & ycf1) loci for most of the species of Kosteletzkya (60 accessions belonging to 15 species of ingroup taxa) as well as some outgroup taxa of Hibisceae. Phylogenetic analysis of these data shows that the African and New World species form amonophyletic group. However, the Malagasy species are very distantly related to the rest. The African species form a paraphyletic grade relative to a New World clade. Recent studies of chromosome counts using pollen mother cells revealed diploid,tetraploid, and hexaploid species. These analyses demonstrate that polyploidy has only occurred in and between some African species, at different times and between different parental constituents. These data support the relatively ancient formation of a putative autotetraploid species (K. semota), one recent allotetraploid species (K. borkouana), two relatively ancient, all otetraploid species (K.begoniifolia and K. rotundalata), and one recent all ohexaploid species (K.racemosa). These data underscore the importance of analysis of multiple DNA loci from plastid and nuclear genomes to understand reticulate evolution.

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1 - University of Florida, Department of Biology, Po Box 118526, Gainesville, FL, 32611, USA
2 - University of Florida, Florida Museum of Natural History, PO Box 117800, Gainesville, FL, 32611, USA


Presentation Type: Oral Paper:Papers for Sections
Session: 29
Location: Lindell B/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 9:45 AM
Number: 29006
Abstract ID:64

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