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ITS Sequences and the Phylogeny of the Genus Robinsonia (Asteraceae)

Sequences from the internal transcribed spacer region (ITS) of nuclear ribosomal DNA were used to produce a hypothesis of phylogenetic relationships of six of the seven known species of Robinsonia, the second largest genus endemic to the Juan Fernandez Islands. Sequence divergence between species ra... Full description

Journal Title: Systematic botany 1995-01-01, Vol.20 (1), p.55-64
Main Author: Sang, Tao
Other Authors: Crawford, Daniel J. , Stuessy, Tod F. , O., Mario Silva
Format: Electronic Article Electronic Article
Language: English
Subjects:
Quelle: Alma/SFX Local Collection
Publisher: American Society of Plant Taxonomists
ID: ISSN: 0363-6445
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recordid: cdi_crossref_primary_10_2307_2419632
title: ITS Sequences and the Phylogeny of the Genus Robinsonia (Asteraceae)
format: Article
creator:
  • Sang, Tao
  • Crawford, Daniel J.
  • Stuessy, Tod F.
  • O., Mario Silva
subjects:
  • Biological taxonomies
  • Evolution
  • Genera
  • Genetic mutation
  • Internal transcribed spacers
  • Phylogenetics
  • Phylogeny
  • Plants
  • Ribosomal DNA
  • We they distinction
ispartof: Systematic botany, 1995-01-01, Vol.20 (1), p.55-64
description: Sequences from the internal transcribed spacer region (ITS) of nuclear ribosomal DNA were used to produce a hypothesis of phylogenetic relationships of six of the seven known species of Robinsonia, the second largest genus endemic to the Juan Fernandez Islands. Sequence divergence between species ranges from 0.00 to 6.77% [mean (3.65 ± 2.15)%], and all sequences are the same length. One most parsimonious tree was produced from the 70 variable nucleotide sites, including the species of Senecio as outgroups; this had a consistency index of 0.92 excluding uninformative sites. The cladogram is fully concordant with one generated from morphology, with R. berteroi, the only species of subg. Rhetinodendron, as the sister taxon to the remaining species in subg. Robinsonia. Within subg. Robinsonia, sects. Eleutherolepis and Robinsonia are monophyletic. Within the former section, R. masafuerae, the only species of Robinsonia on the younger island of Masafuera, is the sister species to R. evenia, as it is in the phylogeny based on morphology. ITS sequences also provide strong support for the monophyly of Robinsonia. The average rate of ITS sequence divergence within the genus was estimated to be at least (7.83 ± 0.74) x 10-9 per site per year. Relative rate tests indicate that the molecular clock cannot be rejected for ITS sequence evolution in Robinsonia. The mode and tempo of ITS and cpDNA evolution were compared in Robinsonia and Dendroseris, the two largest endemic genera on the Juan Fernandez Islands. In both genera, mean sequence divergence between species was higher in ITS than in cpDNA. The distribution of mutations in ITS and cpDNA differ between the two genera. In Dendroseris, ITS sequences produced the same phylogeny as cpDNA, whereas in Robinsonia, cpDNA restriction site mutations did not resolve phylogenetic relationships among the studied species while ITS sequences generated a highly resolved phylogeny.
language: eng
source: Alma/SFX Local Collection
identifier: ISSN: 0363-6445
fulltext: fulltext
issn:
  • 0363-6445
  • 1548-2324
url: Link


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titleITS Sequences and the Phylogeny of the Genus Robinsonia (Asteraceae)
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descriptionSequences from the internal transcribed spacer region (ITS) of nuclear ribosomal DNA were used to produce a hypothesis of phylogenetic relationships of six of the seven known species of Robinsonia, the second largest genus endemic to the Juan Fernandez Islands. Sequence divergence between species ranges from 0.00 to 6.77% [mean (3.65 ± 2.15)%], and all sequences are the same length. One most parsimonious tree was produced from the 70 variable nucleotide sites, including the species of Senecio as outgroups; this had a consistency index of 0.92 excluding uninformative sites. The cladogram is fully concordant with one generated from morphology, with R. berteroi, the only species of subg. Rhetinodendron, as the sister taxon to the remaining species in subg. Robinsonia. Within subg. Robinsonia, sects. Eleutherolepis and Robinsonia are monophyletic. Within the former section, R. masafuerae, the only species of Robinsonia on the younger island of Masafuera, is the sister species to R. evenia, as it is in the phylogeny based on morphology. ITS sequences also provide strong support for the monophyly of Robinsonia. The average rate of ITS sequence divergence within the genus was estimated to be at least (7.83 ± 0.74) x 10-9 per site per year. Relative rate tests indicate that the molecular clock cannot be rejected for ITS sequence evolution in Robinsonia. The mode and tempo of ITS and cpDNA evolution were compared in Robinsonia and Dendroseris, the two largest endemic genera on the Juan Fernandez Islands. In both genera, mean sequence divergence between species was higher in ITS than in cpDNA. The distribution of mutations in ITS and cpDNA differ between the two genera. In Dendroseris, ITS sequences produced the same phylogeny as cpDNA, whereas in Robinsonia, cpDNA restriction site mutations did not resolve phylogenetic relationships among the studied species while ITS sequences generated a highly resolved phylogeny.
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subjectBiological taxonomies ; Evolution ; Genera ; Genetic mutation ; Internal transcribed spacers ; Phylogenetics ; Phylogeny ; Plants ; Ribosomal DNA ; We they distinction
ispartofSystematic botany, 1995-01-01, Vol.20 (1), p.55-64
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descriptionSequences from the internal transcribed spacer region (ITS) of nuclear ribosomal DNA were used to produce a hypothesis of phylogenetic relationships of six of the seven known species of Robinsonia, the second largest genus endemic to the Juan Fernandez Islands. Sequence divergence between species ranges from 0.00 to 6.77% [mean (3.65 ± 2.15)%], and all sequences are the same length. One most parsimonious tree was produced from the 70 variable nucleotide sites, including the species of Senecio as outgroups; this had a consistency index of 0.92 excluding uninformative sites. The cladogram is fully concordant with one generated from morphology, with R. berteroi, the only species of subg. Rhetinodendron, as the sister taxon to the remaining species in subg. Robinsonia. Within subg. Robinsonia, sects. Eleutherolepis and Robinsonia are monophyletic. Within the former section, R. masafuerae, the only species of Robinsonia on the younger island of Masafuera, is the sister species to R. evenia, as it is in the phylogeny based on morphology. ITS sequences also provide strong support for the monophyly of Robinsonia. The average rate of ITS sequence divergence within the genus was estimated to be at least (7.83 ± 0.74) x 10-9 per site per year. Relative rate tests indicate that the molecular clock cannot be rejected for ITS sequence evolution in Robinsonia. The mode and tempo of ITS and cpDNA evolution were compared in Robinsonia and Dendroseris, the two largest endemic genera on the Juan Fernandez Islands. In both genera, mean sequence divergence between species was higher in ITS than in cpDNA. The distribution of mutations in ITS and cpDNA differ between the two genera. In Dendroseris, ITS sequences produced the same phylogeny as cpDNA, whereas in Robinsonia, cpDNA restriction site mutations did not resolve phylogenetic relationships among the studied species while ITS sequences generated a highly resolved phylogeny.
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2Genera
3Genetic mutation
4Internal transcribed spacers
5Phylogenetics
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9We they distinction
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abstractSequences from the internal transcribed spacer region (ITS) of nuclear ribosomal DNA were used to produce a hypothesis of phylogenetic relationships of six of the seven known species of Robinsonia, the second largest genus endemic to the Juan Fernandez Islands. Sequence divergence between species ranges from 0.00 to 6.77% [mean (3.65 ± 2.15)%], and all sequences are the same length. One most parsimonious tree was produced from the 70 variable nucleotide sites, including the species of Senecio as outgroups; this had a consistency index of 0.92 excluding uninformative sites. The cladogram is fully concordant with one generated from morphology, with R. berteroi, the only species of subg. Rhetinodendron, as the sister taxon to the remaining species in subg. Robinsonia. Within subg. Robinsonia, sects. Eleutherolepis and Robinsonia are monophyletic. Within the former section, R. masafuerae, the only species of Robinsonia on the younger island of Masafuera, is the sister species to R. evenia, as it is in the phylogeny based on morphology. ITS sequences also provide strong support for the monophyly of Robinsonia. The average rate of ITS sequence divergence within the genus was estimated to be at least (7.83 ± 0.74) x 10-9 per site per year. Relative rate tests indicate that the molecular clock cannot be rejected for ITS sequence evolution in Robinsonia. The mode and tempo of ITS and cpDNA evolution were compared in Robinsonia and Dendroseris, the two largest endemic genera on the Juan Fernandez Islands. In both genera, mean sequence divergence between species was higher in ITS than in cpDNA. The distribution of mutations in ITS and cpDNA differ between the two genera. In Dendroseris, ITS sequences produced the same phylogeny as cpDNA, whereas in Robinsonia, cpDNA restriction site mutations did not resolve phylogenetic relationships among the studied species while ITS sequences generated a highly resolved phylogeny.
pubAmerican Society of Plant Taxonomists
doi10.2307/2419632