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Relationships of Asanthus (Asteraceae, Eupatorieae)

Analysis of DNA sequence data was used to clarify the circumscription and relationships of the small Mexican genus Asanthus. Results from non-coding regions, including the nuclear ITS and the chloroplast psbA-trnH spacer showed that Asanthus is clearly monophyletic and distinct from Steviopsis and B... Full description

Journal Title: Systematic botany 2013-02, Vol.38 (1), p.253-258
Main Author: Schilling, Edward E
Other Authors: Panero, Jose L , Crozier, Bonnie S , Aranda, Patricia Dávila
Format: Electronic Article Electronic Article
Language: English
Subjects:
Quelle: Alma/SFX Local Collection
Publisher: American Society of Plant Toxonomists
ID: ISSN: 0363-6445
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title: Relationships of Asanthus (Asteraceae, Eupatorieae)
format: Article
creator:
  • Schilling, Edward E
  • Panero, Jose L
  • Crozier, Bonnie S
  • Aranda, Patricia Dávila
subjects:
  • Biological taxonomies
  • Botany
  • Brickellia
  • Brickelliastrum
  • Divergence Times
  • Genera
  • Internal transcribed spacers
  • Mexico
  • Phylogenetics
  • Phylogeny
  • Plants
  • Species
  • Steviopsis
  • Taxa
  • We they distinction
ispartof: Systematic botany, 2013-02, Vol.38 (1), p.253-258
description: Analysis of DNA sequence data was used to clarify the circumscription and relationships of the small Mexican genus Asanthus. Results from non-coding regions, including the nuclear ITS and the chloroplast psbA-trnH spacer showed that Asanthus is clearly monophyletic and distinct from Steviopsis and Brickellia, two genera with which it is sometimes lumped, as well as from the closely related Brickelliastrum and Carminatia. The DNA sequence data also agree with morphological observations in showing that Asanthus is composed of three species, A. thyrsiflorus from the Sierra Madre Oriental and A. squamulosus and A. solidaginifolius from the Sierra Madre Occidental. Samples from the southern Sierra Madre Occidental that have been identified as A. thyrsiflorus are suggested by the presence of an additive pattern of polymorphisms in the nuclear ITS region to be of interspecific hybrid origin between A. thyrsiflorus and A. solidaginifolius, which is consistent with reports of their morphological intergradation in this area. The results suggest that geographic separation and divergence within Asanthus is now being followed by secondary contact, and point to a dynamic pattern of movement and change in the genus.
language: eng
source: Alma/SFX Local Collection
identifier: ISSN: 0363-6445
fulltext: fulltext
issn:
  • 0363-6445
  • 1548-2324
url: Link


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descriptionAnalysis of DNA sequence data was used to clarify the circumscription and relationships of the small Mexican genus Asanthus. Results from non-coding regions, including the nuclear ITS and the chloroplast psbA-trnH spacer showed that Asanthus is clearly monophyletic and distinct from Steviopsis and Brickellia, two genera with which it is sometimes lumped, as well as from the closely related Brickelliastrum and Carminatia. The DNA sequence data also agree with morphological observations in showing that Asanthus is composed of three species, A. thyrsiflorus from the Sierra Madre Oriental and A. squamulosus and A. solidaginifolius from the Sierra Madre Occidental. Samples from the southern Sierra Madre Occidental that have been identified as A. thyrsiflorus are suggested by the presence of an additive pattern of polymorphisms in the nuclear ITS region to be of interspecific hybrid origin between A. thyrsiflorus and A. solidaginifolius, which is consistent with reports of their morphological intergradation in this area. The results suggest that geographic separation and divergence within Asanthus is now being followed by secondary contact, and point to a dynamic pattern of movement and change in the genus.
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subjectBiological taxonomies ; Botany ; Brickellia ; Brickelliastrum ; Divergence Times ; Genera ; Internal transcribed spacers ; Mexico ; Phylogenetics ; Phylogeny ; Plants ; Species ; Steviopsis ; Taxa ; We they distinction
ispartofSystematic botany, 2013-02, Vol.38 (1), p.253-258
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descriptionAnalysis of DNA sequence data was used to clarify the circumscription and relationships of the small Mexican genus Asanthus. Results from non-coding regions, including the nuclear ITS and the chloroplast psbA-trnH spacer showed that Asanthus is clearly monophyletic and distinct from Steviopsis and Brickellia, two genera with which it is sometimes lumped, as well as from the closely related Brickelliastrum and Carminatia. The DNA sequence data also agree with morphological observations in showing that Asanthus is composed of three species, A. thyrsiflorus from the Sierra Madre Oriental and A. squamulosus and A. solidaginifolius from the Sierra Madre Occidental. Samples from the southern Sierra Madre Occidental that have been identified as A. thyrsiflorus are suggested by the presence of an additive pattern of polymorphisms in the nuclear ITS region to be of interspecific hybrid origin between A. thyrsiflorus and A. solidaginifolius, which is consistent with reports of their morphological intergradation in this area. The results suggest that geographic separation and divergence within Asanthus is now being followed by secondary contact, and point to a dynamic pattern of movement and change in the genus.
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abstractAnalysis of DNA sequence data was used to clarify the circumscription and relationships of the small Mexican genus Asanthus. Results from non-coding regions, including the nuclear ITS and the chloroplast psbA-trnH spacer showed that Asanthus is clearly monophyletic and distinct from Steviopsis and Brickellia, two genera with which it is sometimes lumped, as well as from the closely related Brickelliastrum and Carminatia. The DNA sequence data also agree with morphological observations in showing that Asanthus is composed of three species, A. thyrsiflorus from the Sierra Madre Oriental and A. squamulosus and A. solidaginifolius from the Sierra Madre Occidental. Samples from the southern Sierra Madre Occidental that have been identified as A. thyrsiflorus are suggested by the presence of an additive pattern of polymorphisms in the nuclear ITS region to be of interspecific hybrid origin between A. thyrsiflorus and A. solidaginifolius, which is consistent with reports of their morphological intergradation in this area. The results suggest that geographic separation and divergence within Asanthus is now being followed by secondary contact, and point to a dynamic pattern of movement and change in the genus.
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