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Phylogeny and a new tribal classification of the Panicoideae s.l. (Poaceae) based on plastid and nuclear sequence data and structural data
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Phylogeny and a new tribal classification of the Panicoideae s.l. (Poaceae) based on plastid and nuclear sequence data and structural data
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Phylogeny and a new tribal classification of the Panicoideae s.l. (Poaceae) based on plastid and nuclear sequence data and structural data
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Journal Article
Phylogeny and a new tribal classification of the Panicoideae s.l. (Poaceae) based on plastid and nuclear sequence data and structural data
2010
Overview
Premise of the study: The subfamily Panicoideae (Poaceae) encompasses nearly one-third of the diversity of grass species, including important crops such as maize and sugarcane. Previous analyses recovered strong support for a Panicoideae+Centothecoideae lineage within the diverse Panicoideae+Arundinoideae+Chloridoideae+Micrairoideae+Aristidoideae+Danthonioideae (PACMAD) clade, although support for internal relationships was inconsistent. The objectives of this research were to (1) further test the monophyly of each subfamily and previously recovered clades within the Panicoideae+Centothecoideae lineage, (2) establish phylogenetic relationships among these groups, and (3) propose a new tribal classification for this lineage based explicitly on the phylogeny. METHODS: Maximum parsimony and Bayesian inference analyses of 37 taxa were based on previously published sequences (ndhF and rpl16 intron) and on new plastid and nuclear (rbcL and granule-bound starch synthase I) sequence data as well as structural data. Key results. The Panicoideae+Centothecoideae lineage and a majority of the clades identified in previous analyses continue to be robustly supported, but resolution along the backbone of the topology remains elusive. Support for the monophyly of both subfamilies was lacking although support values for some clades increased. The tribes Centotheceae and Arundinelleae were confirmed as polyphyletic. CONCLUSIONS: Subfamily Centothecoideae is formally submerged into the Panicoideae, and a new tribal classification for the expanded Panicoideae is proposed based explicitly on the phylogeny. This classification includes 12 tribes of which Chasmanthieae and Zeugiteae are segretated from the Centotheceae; Tristachyideae is segregated from Arundinelleae, and a new tribe, Cyperochloeae, is validated to accommodate two isolated genera. A key to the tribes is provided.
