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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 Eleusininae (Poaceae: Chloridoideae: Cynodonteae).

Morphologically, the subtribe Eleusininae is a diverse group (although most species have racemose inflorescences) containing about 211 species in 28 genera found primarily in low latitudes in Africa, Asia, Australia, and the Americas. Seven of the genera are monotypic, 16 genera contain 10 or less species, and only five genera contain 13 or more species: Chloris (59 spp.), Dinebra (23+ spp.), Enteropogon (18 spp.), Eustachys (13 spp.), and Lepturus (15 spp.). Evolutionary relationships and a modern classification of the Eleusininae based on the study of molecular characters have only been superficially investigated. Therefore, we conducted a phylogenetic analysis on 155 species (292 samples) in the Eleusininae 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 and revise the classification. The species traditionally placed in Chloris are found in four separate, strongly supported clades with the majority of species found in a large clade that includes C. cruciata (type); embedded in this major Chloris clade are: Enteropogon prieurii, Lintonia nutans (type) and Ochthochloa compressa (type). Brachyachne convergens (type) along with three other species of Brachyachne are embedded in a strongly supported clade containing all species of Cynodon; four additional species of Brachyachne form a separate strongly supported clade; and seven species currently placed in Chloris form a strongly supported clade that is sister to Cynodon. Most species of Enteropogon form a strongly supported clade, although E. chlorideus, E. brandegei, and  Saugetia fasciculata are sister to a moderately supported clade that includes all species of Tetrapogon and Chloris roxburghiana. Chloris exilis and Enteropogon mollis are embedded in a strongly supported Leptochloa clade. Afrotrichloris martinii (type) is sister to Schoenefeldia transiens, and together they are sister to Schoenefeldia gracilis (type).


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1 - Smithsonian Institution, Botany, MRC-166, National Museum of Natural History, P.O. Box 37012, Washington, DC, 20013-7012, USA
2 - Instituto Politecnico Nacional, CIIDIR Unidad Durango-COFAA, Durango, Dgo, C.P. 34220, MEXICO

Keywords:
Brachyachne
Chloris
Phylogenetic classification
Cynodon
Enteropogon
ITS
Leptochloa
plastid DNA sequences
systematics.

Presentation Type: Oral Paper:Papers for Sections
Session: 13
Location: Pines South/Boise Centre
Date: Monday, July 28th, 2014
Time: 2:30 PM
Number: 13005
Abstract ID:230
Candidate for Awards:None


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