NDLI: What does the 5S rRNA multigene family tell us about the origin of the annual Triticeae (Poaceae)?

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What does the 5S rRNA multigene family tell us about the origin of the annual Triticeae (Poaceae)?

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What does the 5S rRNA multigene family tell us about the origin of the annual Triticeae (Poaceae)?

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Baum, B. R. Edwards, T. Johnson, D. A.
Description	Country affiliation: Canada Author Affiliation: Baum BR ( Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Centre, Neatby Building, 960 Carling Avenue, Ottawa, ON K1A 0C6, Canada. Bernard.baum@agr.gc.ca)
Abstract	We have investigated the complex relationships among the annual genera within the tribe Triticeae through phylogenetic analyses of the 5S rRNA multigene family. Cloned sequences were assigned to groups of orthologous sequences, called unit classes, that were subjected to several analyses including BLAST (Basic Local Alignment Search Tool) searches to assess possible ancestral relationships with perennial genera; phylogenetic analyses using parsimony (Pars), maximum likelihood (ML), and Bayesian methods; and minimum reticulation networks from the Pars, ML, and Bayesian trees. In this study, we included genera with both annual and perennial species, such as Dasypyrum, Hordeum, and Secale. BLAST pointed to Pseudoroegneria (carrier of the St genome) and possibly Thinopyrum (carrier of the J genome) as the potential next of kin. However, Thinopyrum and Pseudoroegneria have never fallen together on the individual trees with the former generally associated with Crithopsis, Aegilops, Triticum, and Dasypyrum, while the latter is usually associated with the rest of the genera within Triticeae. The 'long' unit classes placed Dasypyrum breviaristatum together with Dasypyrum villosum, whereas the 'short' unit classes put them far apart on the trees. None of the gene trees alone was able to summarize the complex relationships among the genera, in line with previous results in the Triticeae. However, the application of tools designed to display phylogenetic networks was able to depict the complex links among the genera based on the short and the long gene trees, including the close link between Thinopyrum and Pseudoroegneria suggested by the phylogenetic analyses. In addition, our analyses provide support for the hypothesis that at least some annual Triticeae taxa are derived from their perennial relatives.
File Format	HTM / HTML
ISSN	08312796
e-ISSN	14803321
Journal	Genome
Issue Number	5
Volume Number	56
Language	English
Publisher	Canadian Science Publishing
Publisher Date	2013-05-01
Publisher Place	Canada
Access Restriction	Open
Subject Keyword	Discipline Genetics Phylogeny Poaceae Genetics Rna, Ribosomal, 5s Evolution, Molecular Genes, Plant Multigene Family Classification Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Molecular Biology Biotechnology

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