Abstract
A phylogenetic analysis was conducted on sequences of the internal transcribed spacer (ITS) region of nuclear ribosomal DNA in 23 species ofAveneae (Poaceae subfam.Pooideaae). These sequences ofHelictotrichon spp.,Arrhenatherum elatius, Avena spp.,Trisetum spp.,Koeleria spp.,Holcus lanatus, Alopecurus vaginatus together with published ITS sequences of furtherAveneae, Poeae, Triticeae, andBromeae were analysed by the neighbor-joining distance method to assess the molecular phylogenetic relationship in perennial and annualAveneae. The results suggest unexpectedly close affinities of the agronomically important genusAvena to comparatively small-flowered taxa ofAveneae. GenusArrhenatherum and small-flowered subgenera ofHelictotrichon are close extant relatives. The large genusHelictotrichon is para- if not polyphyletic, only its subgenera are monophyletic.Trisetum is clearly separated fromHelictotrichon and forms together withKoeleria and perhaps others a monophyletic lineage which is characterised by a conspicuous 9-bp deletion in ITS1. The impact of the ITS data on the delineation of some genera and subtribes ofAveneae and on the recognition of their biogeographical and ecological patterns is outlined.
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Grebenstein, B., Röser, M., Sauer, W. et al. Molecular phylogenetic relationships inAveneae (Poaceae) species and other grasses as inferred from ITS1 and ITS2 rDNA sequences. Pl Syst Evol 213, 233–250 (1998). https://doi.org/10.1007/BF00985203
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DOI: https://doi.org/10.1007/BF00985203