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Phylogenetic Relationships of Asclepias (Apocynaceae) Inferred from Non-Coding Chloroplast DNA Sequences

Milkweeds (Asclepias s. l., Apocynaceae) are characteristic perennial herbs of grasslands in North America and Africa that have long served as models for studying the evolutionary ecology of plant reproduction and plant defense. Generic circumscription of Asclepias has been long debated with recent... Full description

Journal Title: Systematic botany 2011-10, Vol.36 (4), p.1008-1023
Main Author: Fishbein, Mark
Other Authors: Chuba, David , Ellison, Chris , Mason-Gamer, Roberta J , Lynch, Steven P
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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recordid: cdi_gale_infotracacademiconefile_A272047961
title: Phylogenetic Relationships of Asclepias (Apocynaceae) Inferred from Non-Coding Chloroplast DNA Sequences
format: Article
creator:
  • Fishbein, Mark
  • Chuba, David
  • Ellison, Chris
  • Mason-Gamer, Roberta J
  • Lynch, Steven P
subjects:
  • Africa
  • America
  • Apocynaceae
  • Asclepias
  • Bayesian analysis
  • Biogeography
  • Biological taxonomies
  • Chloroplast DNA
  • Chloroplasts
  • Classification
  • Colonization
  • Ecology
  • Evolution
  • Genetic aspects
  • Genomes
  • Grasslands
  • Herbs
  • Hypothesis Test
  • Introns
  • Lynchings
  • Mathematical models
  • Milkweed
  • Monophyly
  • Nucleotide sequencing
  • Parsimony
  • Phylogenetics
  • Phylogeny
  • Physiological aspects
  • Plant genetics
  • Plants
  • Plastids
  • Reproduction
  • Spacer
  • Taxa
  • Workers
ispartof: Systematic botany, 2011-10, Vol.36 (4), p.1008-1023
description: Milkweeds (Asclepias s. l., Apocynaceae) are characteristic perennial herbs of grasslands in North America and Africa that have long served as models for studying the evolutionary ecology of plant reproduction and plant defense. Generic circumscription of Asclepias has been long debated with recent workers favoring delimitation on geographic grounds; Asclepias s. s. is limited to the Americas and only segregate genera are recognized for African species. A widely used system introduced by Woodson classifies North American Asclepias into nine subgenera, with the largest subgenus, Asclepias, further divided into eight series. We investigated the phylogeny of Asclepias using three noncoding loci from the plastid genome: rpl16 intron, trnCGCA—rpoB spacer, and the adjacent trnSGCU—trnGuuc spacer and trnGuuc intron. Parsimony, likelihood, and Bayesian analyses were conducted to evaluate hypotheses of continental and taxonomic monophyly. Hypothesis tests were conducted under the parsimony and likelihood criteria. We found moderate support for the monophyly of American Asclepias s. s. and for all but one representative of African Asclepias s. l. Within the Amerian clade, South American species are strongly supported as monophyletic and derived from North American ancestors. Only one of Woodson's 17 infrageneric taxa was found to be monophyletic. Monophyly of more than one half of the remaining 16 taxa could be statistically rejected using a conservative α level. Our results are consistent with taxonomic restriction of Asclepias to American species and single colonization events from Africa to North America and North America to South America. They also point to a need for major restructuring of infrageneric classification and future revsionary work.
language: eng
source: Alma/SFX Local Collection
identifier: ISSN: 0363-6445
fulltext: fulltext
issn:
  • 0363-6445
  • 1548-2324
url: Link


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titlePhylogenetic Relationships of Asclepias (Apocynaceae) Inferred from Non-Coding Chloroplast DNA Sequences
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descriptionMilkweeds (Asclepias s. l., Apocynaceae) are characteristic perennial herbs of grasslands in North America and Africa that have long served as models for studying the evolutionary ecology of plant reproduction and plant defense. Generic circumscription of Asclepias has been long debated with recent workers favoring delimitation on geographic grounds; Asclepias s. s. is limited to the Americas and only segregate genera are recognized for African species. A widely used system introduced by Woodson classifies North American Asclepias into nine subgenera, with the largest subgenus, Asclepias, further divided into eight series. We investigated the phylogeny of Asclepias using three noncoding loci from the plastid genome: rpl16 intron, trnCGCA—rpoB spacer, and the adjacent trnSGCU—trnGuuc spacer and trnGuuc intron. Parsimony, likelihood, and Bayesian analyses were conducted to evaluate hypotheses of continental and taxonomic monophyly. Hypothesis tests were conducted under the parsimony and likelihood criteria. We found moderate support for the monophyly of American Asclepias s. s. and for all but one representative of African Asclepias s. l. Within the Amerian clade, South American species are strongly supported as monophyletic and derived from North American ancestors. Only one of Woodson's 17 infrageneric taxa was found to be monophyletic. Monophyly of more than one half of the remaining 16 taxa could be statistically rejected using a conservative α level. Our results are consistent with taxonomic restriction of Asclepias to American species and single colonization events from Africa to North America and North America to South America. They also point to a need for major restructuring of infrageneric classification and future revsionary work.
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subjectAfrica ; America ; Apocynaceae ; Asclepias ; Bayesian analysis ; Biogeography ; Biological taxonomies ; Chloroplast DNA ; Chloroplasts ; Classification ; Colonization ; Ecology ; Evolution ; Genetic aspects ; Genomes ; Grasslands ; Herbs ; Hypothesis Test ; Introns ; Lynchings ; Mathematical models ; Milkweed ; Monophyly ; Nucleotide sequencing ; Parsimony ; Phylogenetics ; Phylogeny ; Physiological aspects ; Plant genetics ; Plants ; Plastids ; Reproduction ; Spacer ; Taxa ; Workers
ispartofSystematic botany, 2011-10, Vol.36 (4), p.1008-1023
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descriptionMilkweeds (Asclepias s. l., Apocynaceae) are characteristic perennial herbs of grasslands in North America and Africa that have long served as models for studying the evolutionary ecology of plant reproduction and plant defense. Generic circumscription of Asclepias has been long debated with recent workers favoring delimitation on geographic grounds; Asclepias s. s. is limited to the Americas and only segregate genera are recognized for African species. A widely used system introduced by Woodson classifies North American Asclepias into nine subgenera, with the largest subgenus, Asclepias, further divided into eight series. We investigated the phylogeny of Asclepias using three noncoding loci from the plastid genome: rpl16 intron, trnCGCA—rpoB spacer, and the adjacent trnSGCU—trnGuuc spacer and trnGuuc intron. Parsimony, likelihood, and Bayesian analyses were conducted to evaluate hypotheses of continental and taxonomic monophyly. Hypothesis tests were conducted under the parsimony and likelihood criteria. We found moderate support for the monophyly of American Asclepias s. s. and for all but one representative of African Asclepias s. l. Within the Amerian clade, South American species are strongly supported as monophyletic and derived from North American ancestors. Only one of Woodson's 17 infrageneric taxa was found to be monophyletic. Monophyly of more than one half of the remaining 16 taxa could be statistically rejected using a conservative α level. Our results are consistent with taxonomic restriction of Asclepias to American species and single colonization events from Africa to North America and North America to South America. They also point to a need for major restructuring of infrageneric classification and future revsionary work.
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24Parsimony
25Phylogenetics
26Phylogeny
27Physiological aspects
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abstractMilkweeds (Asclepias s. l., Apocynaceae) are characteristic perennial herbs of grasslands in North America and Africa that have long served as models for studying the evolutionary ecology of plant reproduction and plant defense. Generic circumscription of Asclepias has been long debated with recent workers favoring delimitation on geographic grounds; Asclepias s. s. is limited to the Americas and only segregate genera are recognized for African species. A widely used system introduced by Woodson classifies North American Asclepias into nine subgenera, with the largest subgenus, Asclepias, further divided into eight series. We investigated the phylogeny of Asclepias using three noncoding loci from the plastid genome: rpl16 intron, trnCGCA—rpoB spacer, and the adjacent trnSGCU—trnGuuc spacer and trnGuuc intron. Parsimony, likelihood, and Bayesian analyses were conducted to evaluate hypotheses of continental and taxonomic monophyly. Hypothesis tests were conducted under the parsimony and likelihood criteria. We found moderate support for the monophyly of American Asclepias s. s. and for all but one representative of African Asclepias s. l. Within the Amerian clade, South American species are strongly supported as monophyletic and derived from North American ancestors. Only one of Woodson's 17 infrageneric taxa was found to be monophyletic. Monophyly of more than one half of the remaining 16 taxa could be statistically rejected using a conservative α level. Our results are consistent with taxonomic restriction of Asclepias to American species and single colonization events from Africa to North America and North America to South America. They also point to a need for major restructuring of infrageneric classification and future revsionary work.
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