Phylogenetic relationships in subtribe Poinae (Poaceae, Poeae) based on nuclear ITS and plastid trnT–trnL–trnF sequencesThis paper is one of a selection of papers published in the Special Issue on Systematics Research.
- 1 August 2008
- journal article
- research article
- Published by Canadian Science Publishing in Botany
- Vol. 86 (8), 938-967
- https://doi.org/10.1139/b08-076
Abstract
The worldwide temperate subtribe Poinae comprises the largest grass genus, Poa (500+ species), and multiple additional small genera. We explore generic boundaries and relationships among genera of Poinae using nuclear ribosomal internal transcribed spacer data (ITS) and plastid trnT–trnL–trnF (TLF) sequence data. ITS and TLF analyses are mostly congruent with regards to circumscription of genera, and with respect to relationships among Poinae genera, but tree structure is generally better supported among genera in the ITS strict consensus tree. ITS and TLF both support two main Poinae lineages: (i) Poa and (ii) a clade comprising all other sampled Poinae. Nine small genera were nested within the large Poa clade, including Aphanelytrum , Dissanthelium , and Tovarochloa , supporting inclusion of these as sections within Poa. In the second clade, three subclades support close relationships among Nicoraepoa , Hookerochloa , and Arctagrostis ; Arctophila and Dupontia ; and Apera , Bellardiochloa , and Ventenata . Genera of the related subtribes Alopecurinae, Cinninae, and Miliinae were mixed among or in part external to Poinae in different ways in ITS and TLF analyses, and only subtribe Puccinelliinae was strongly supported and monophyletic. ITS analyses supported placement of Catabrosella , Hyalopoa , and Paracolpodium in Puccinelliinae (no TLF data available). The position of Poa subgenus Arctopoa is incongruent between the two analyses: TLF data support inclusion within Poa and ITS data place it outside of Poa. Similarly, TLF data resolves the genus Aniselytron outside of Poa, whereas ITS data place it within Poa. Based on these results and a consideration of morphology, we recognize Arctopoa and Aniselytron as genera, probably of ancient hybrid origins. Nothogenus × Duarctopoa is coined for Arctopoa × Dupontia, with a single nothospecies × Duarctopoa labradorica . A new combination is provided for Poa subg. Sylvestres .Keywords
This publication has 35 references indexed in Scilit:
- Phylogeny of the tribe Aveneae (Pooideae, Poaceae) inferred from plastid trnT‐F and nuclear ITS sequencesAmerican Journal of Botany, 2007
- Chromosomal localization and evolution of satellite DNAs and heterochromatin in grasses (Poaceae), especially tribe AveneaeÖsterreichische botanische Zeitschrift, 2006
- Systematics of Festuca L. sects. Eskia Willk., Pseudatropis Kriv., Amphigenes (Janka) Tzvel., Pseudoscariosa Kriv. and Scariosae Hack. based on analysis of morphological characters and DNA sequencesÖsterreichische botanische Zeitschrift, 2003
- The Grasses: A Case Study in MacroevolutionAnnual Review of Ecology and Systematics, 2000
- Molecular phylogenetic relationships inAveneae (Poaceae) species and other grasses as inferred from ITS1 and ITS2 rDNA sequencesÖsterreichische botanische Zeitschrift, 1998
- The genus Colpodium (Gramineae) in AfricaNordic Journal of Botany, 1994
- Phylogenetic Relationships Among Puccinellia and Allied Genera of Poaceae as Inferred from Chloroplast DNA Restriction Site VariationAmerican Journal of Botany, 1994
- Universal primers for amplification of three non-coding regions of chloroplast DNAPlant Molecular Biology, 1991
- PoaL. in New ZealandNew Zealand Journal of Botany, 1986
- Confidence Limits on Phylogenies: An Approach Using the BootstrapEvolution, 1985