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Putative parentage of six Old World polyploids in Tragopogon L. (Asteraceae: Scorzonerinae) based on ITS, ETS, and plastid sequence data

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Abstract:

Using plastid, ITS, and ETS sequences, we investigated the parentage of polyploids Tragopogon buphthalmoides, T. castellanus, T. coloratus, T. gracilis, T. latifolius, and T. tuberosus. One of the parents of T. tuberosus is a member of the Collini clade (likely T. marginatus) and the second parent is part of the Angustissimi clade, most likely T. pusillus. Tragopogon bornmuelleri and T. rechingeri are not likely parents of T. buphthalmoides. Tragopogon crocifolius and T. lamottei are parents of T. castellanus. Tragopogon latifolius var. latifolius is an allotetroploid, with one parent from the Angustissimi clade (T. graminifolius or T. pusillus) and the other parent is a diploid or tetraploid from the Profundisulcati clade (likely T. buphthalmoides); one likely parent of tetraploid T. coloratus is a tetraploid T. buphthalmoides and the other one is a diploid T. australis (T. porrifolius ssp. australis). Molecular data clearly argue against the inclusion of this tetraploid within T. coloratus (2n = 12). Tragopogon tomentosulus is not closely related to T. gracilis. Tragopogon acanthocarpus is nonmonophyletic based on rDNA and plastid sequence data. Homogenization of rDNA repeats has occurred to varying degrees in the Eurasian polyploids.

Keywords: ETS; ITS; PLASTID SEQUENCE DATA; POLYPLOIDY; RDNA REPEAT HOMOGENIZATION; TRAGOPOGON

Document Type: Research Article

Affiliations: 1: Department of Botany, University of Florida, Gainesville, Florida 32611, U.S.A., Florida Museum of Natural History, University of Florida, Gainesville, Forida 32611, U.S.A.;, Email: evgeny@ufl.edu 2: Florida Museum of Natural History, University of Florida, Gainesville, Forida 32611, U.S.A.;, Email: psoltis@flmnh.ufl.edu 3: Department of Botany, University of Florida, Gainesville, Florida 32611, U.S.A.

Publication date: 2008-11-01

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