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Abstract Detail

Systematics Section/ASPT

Peterson, Paul M. [1], Romaschenko, Konstantin [1], Herrera Arrieta, Yolanda [2].

A molecular phylogeny of the Cynodonteae (Poaceae: Chloridoideae).

Morphologically, the tribe Cynodonteae is a diverse group containing about 839 species in 93 genera and 18 subtribes, found primarily in Africa, Asia, Australia, and the Americas. A modern classification of the Cynodonteae based on the study of molecular characters has resulted in major changes in the circumscription and alignment of genera but there are still 15 incertae sedis genera. Therefore, we conducted a phylogenetic analysis on 200 species (250 samples) in the Cynodonteae using sequence data from four plastid regions (rpL32-trnL spacer, ndhA intron, rps16-trnK spacer, rps16 intron) and the nuclear ribosomal internal transcribed spacer regions (ITS 1 & 2) to infer evolutionary relationships among these 15 genera and revise the classification. Pogononeura biflora appears as the first split in a strongly supported clade within the Tragiinae, which includes Monelytrum, Polevansia, Tragus, and Willkommia. The Neobouteloua lophostachya and N. pauciracemosa pair appear as the first split in a strongly supported clade with Brachychloa and Dactyloctenium, all of which we will describe as a new subtribe. Halopyrum mucronatum is sister to Eragrostiella, Oropetium, and Tripogon in the strongly supported Tripogoninae which includes Demostachya and Melanocenchris. We include a much larger sampling of Tridens species which form a monophyletic lineage within the Pappophorinae, along with Neesiochloa and Pappophorum. Tridens buckleyanus forms a strongly supported clade with Tridentopsis eragrosoides and T. mutica, members of the Gouiniinae.

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Related Links:

1 - Smithsonian Institution, Botany, MRC-166, National Museum of Natural History, Washington, DC, 20013-7012, USA
2 - Instituto Politecnico Nacional, Herbario, CIIDIR Unidad-Durango-COFAA, Durango, Dgo, 34220, Mexico

plastid DNA sequences

Presentation Type: Oral Paper:Papers for Sections
Session: 50
Location: Salon 10/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 4:15 PM
Number: 50011
Abstract ID:809
Candidate for Awards:None

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