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Abstract Detail

Molecular Ecology and Evolution

Chester, Michael [1], Soltis, Pamela [2], Soltis, Douglas [3].

Chromosomal variation in the neoallotetraploid Tragopogon mirus: similarities and differences relative to T. miscellus.

Tragopogon mirus and T. miscellus are allopolyploids that formed repeatedly, c. 80 years ago, providing independent views of post-formation chromosomal changes in natural allopolyploid populations. Both species are known to include individuals with karyotypes that are not additive of their diploid parents, but the extent and patterns of this variation have so far only been assessed in T. miscellus. Here, the results of a cytogenetic survey of six natural T. mirus populations are presented. Surprisingly, given their similar ages, T. mirus shows significantly less karyotypic variation than T. miscellus. However, several similarities between the two Tragopogon neoallopolyploids are apparent, including which chromosomes exhibit copy number variation and which chromosomal regions are rearranged. Furthermore, non-additive T. mirus karyotypes appear to show compensatory chromosome substitutions and rearrangements, as was found for T. miscellus. These observations provide further evidence for factors such as gene-dosage and genomic architecture shaping chromosomal changes in neoallopolyploids.

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1 - University of Florida, Department of Biology, Gainesville, FL, 32605, USA
2 - University of Florida, Florida Museum of Natural History, PO BOX 117800, Gainesville, FL, 32611-7800, USA
3 - University of Florida, Biology and Florida Museum of Natural History, Gainesville, FL, 32605, USA

none specified

Presentation Type: Oral Paper:Papers for Topics
Session: 46
Location: Newberry/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 2:15 PM
Number: 46004
Abstract ID:350
Candidate for Awards:Margaret Menzel Award

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