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When genes tell different stories: the diploid genera of Triticeae (Gramineae)

Gene trees are generally assumed to reflect the underlying phylogeny of the species, and they are, therefore, generally expected to be congruent with each other. Published gene trees from sequences of three nuclear genes--two 5S DNA arrays and the internal transcribed spacer (ITS) of the ribosomal R... Full description

Journal Title: Systematic botany 1996-07, Vol.21 (3), p.321-347
Main Author: Kellogg, E.A. (Harvard University Herbaria, Cambridge, MA.)
Other Authors: Appels, R , Mason-Gamer, R.J
Format: Electronic Article Electronic Article
Language: English
Subjects:
Quelle: Alma/SFX Local Collection
Publisher: American Society of Plant Taxonomists
ID: ISSN: 0363-6445
Link: https://agris.fao.org/agris-search/search.do?recordID=US9735911
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recordid: cdi_crossref_primary_10_2307_2419662
title: When genes tell different stories: the diploid genera of Triticeae (Gramineae)
format: Article
creator:
  • Kellogg, E.A. (Harvard University Herbaria, Cambridge, MA.)
  • Appels, R
  • Mason-Gamer, R.J
subjects:
  • AEGILOPS
  • Biological taxonomies
  • Chloroplasts
  • Datasets
  • DIPLOIDIA
  • DIPLOIDIE
  • Diploidy
  • ESPECE
  • ESPECIES
  • Evolutionary genetics
  • FILOGENIA
  • GENE
  • Genera
  • GENES
  • GENETICA
  • GENETIQUE
  • Genomes
  • GRAMINEAE
  • Phylogenetics
  • PHYLOGENIE
  • Taxa
  • TRITICUM MONOCOCCUM
ispartof: Systematic botany, 1996-07, Vol.21 (3), p.321-347
description: Gene trees are generally assumed to reflect the underlying phylogeny of the species, and they are, therefore, generally expected to be congruent with each other. Published gene trees from sequences of three nuclear genes--two 5S DNA arrays and the internal transcribed spacer (ITS) of the ribosomal RNA gene--are known to give somewhat different histories for diploid members of the Triticeae. A phylogeny based on cpDNA restriction sites gives yet another topology. Some discrepancies come from poorly supported nodes. Other differences, however, are statistically significant. The differences among the nuclear gene trees can be ascribed to particular taxa (notably Triticum monococcum and Aegilops tauschii), which have different histories for particular parts of their genomes. We have removed these two taxa, combined the three nuclear loci to produce a well-supported tree, and introduced the two species later as reticulations. The cpDNA tree has no groups in common with any of the nuclear gene trees, and is therefore not combined with them. Multiple reticulations must be introduced to reconcile the cpDNA and combined nuclear trees. Such dramatic differences among gene trees might be expected among populations in a species complex, but are surprising among intersterile genera
language: eng
source: Alma/SFX Local Collection
identifier: ISSN: 0363-6445
fulltext: fulltext
issn:
  • 0363-6445
  • 1548-2324
url: Link


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titleWhen genes tell different stories: the diploid genera of Triticeae (Gramineae)
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descriptionGene trees are generally assumed to reflect the underlying phylogeny of the species, and they are, therefore, generally expected to be congruent with each other. Published gene trees from sequences of three nuclear genes--two 5S DNA arrays and the internal transcribed spacer (ITS) of the ribosomal RNA gene--are known to give somewhat different histories for diploid members of the Triticeae. A phylogeny based on cpDNA restriction sites gives yet another topology. Some discrepancies come from poorly supported nodes. Other differences, however, are statistically significant. The differences among the nuclear gene trees can be ascribed to particular taxa (notably Triticum monococcum and Aegilops tauschii), which have different histories for particular parts of their genomes. We have removed these two taxa, combined the three nuclear loci to produce a well-supported tree, and introduced the two species later as reticulations. The cpDNA tree has no groups in common with any of the nuclear gene trees, and is therefore not combined with them. Multiple reticulations must be introduced to reconcile the cpDNA and combined nuclear trees. Such dramatic differences among gene trees might be expected among populations in a species complex, but are surprising among intersterile genera
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subjectAEGILOPS ; Biological taxonomies ; Chloroplasts ; Datasets ; DIPLOIDIA ; DIPLOIDIE ; Diploidy ; ESPECE ; ESPECIES ; Evolutionary genetics ; FILOGENIA ; GENE ; Genera ; GENES ; GENETICA ; GENETIQUE ; Genomes ; GRAMINEAE ; Phylogenetics ; PHYLOGENIE ; Taxa ; TRITICUM MONOCOCCUM
ispartofSystematic botany, 1996-07, Vol.21 (3), p.321-347
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abstractGene trees are generally assumed to reflect the underlying phylogeny of the species, and they are, therefore, generally expected to be congruent with each other. Published gene trees from sequences of three nuclear genes--two 5S DNA arrays and the internal transcribed spacer (ITS) of the ribosomal RNA gene--are known to give somewhat different histories for diploid members of the Triticeae. A phylogeny based on cpDNA restriction sites gives yet another topology. Some discrepancies come from poorly supported nodes. Other differences, however, are statistically significant. The differences among the nuclear gene trees can be ascribed to particular taxa (notably Triticum monococcum and Aegilops tauschii), which have different histories for particular parts of their genomes. We have removed these two taxa, combined the three nuclear loci to produce a well-supported tree, and introduced the two species later as reticulations. The cpDNA tree has no groups in common with any of the nuclear gene trees, and is therefore not combined with them. Multiple reticulations must be introduced to reconcile the cpDNA and combined nuclear trees. Such dramatic differences among gene trees might be expected among populations in a species complex, but are surprising among intersterile genera
pubAmerican Society of Plant Taxonomists
doi10.2307/2419662