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Abstract Detail


Systematics Section

Mavrodiev, Evgeny V. [1], Soltis, Douglas E. [2], Soltis, Pamela S. [3].

ITS, ETS, and low-copy gene phylogenies: Untangling the parentage of Eurasian tetraploids in Tragopogon L. (Asteraceae, Scorzonerinae).

Tragopogon L. (Lactuceae, Cichorioideae, Scorzonerinae) is an Old World genus of approximately 100-150 species that occurs across Eurasia. The chromosome number reported for most known species of Tragopogon is 2n = 12 but there are at least 13 polyploids native to Eurasia. However, until recently, there have been few investigations of the parentage of these polyploids. We generated phylogenies based on LFY, ADH, G3PDH, PI, ITS, and ETS sequences for most species of Tragopogon and used these phylogenies to infer the parentage of the Eurasian polyploids Tragopogon buphthalmoides, T. castellanus, T. kashmirianus, T. cazorlanum, and the recently described T. soltisiorum. All of these species appear to be allopolyploids, and we propose putative parents for each. We have also revealed considerable complexity within Tragopogon at the diploid level. Molecular investigations of geographically widespread species in Europe (e.g., T. crocifolius, T. dubius, T. pratensis, T. porrifolius, T. orientalis) indicate that each may be non-monophyletic, comprising several distinct lineages and possibly “cryptic species”. These distinct lineages typically have distinctive ranges and, in some instances, morphologies. These widespread diploids are the proposed parents of some of the Eurasian allopolyploids, as well as the parents of the recently formed T. mirus and T. miscellus from North America.


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1 - University of Florida, Department of Botany, Florida Museum of Natural History, P.O. Box 117800, Gainesville, Florida, 32611-7800, USA
2 - University of Florida, Department of Botany, 220 Bartram Hall, P.O. Box 118526, Gainesville, Florida, 32611-8526, USA
3 - University of Florida, Florida Museum of Natural History, Museum Road and Newell Drive, Dickinson Hall, Gainesville, FL, 32611-7800, USA

Keywords:
Tragopogon
Asteraceae
polyploidy
low-copy nuclear gene
ITS, ETS.

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 46
Location: Cottonwood D/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 4:15 PM
Number: 46013
Abstract ID:417


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