New circumscription of the genus <i>Gamochaeta</i> (Asteraceae, Gnaphalieae) inferred from nuclear and plastid DNA sequences

<i>Gamochaeta</i> (tribe Gnaphalieae, Asteraceae) is composed of ca. 60 species primarily distributed in tropical and subtropical America. Within the tribe Gnaphalieae, the genus is characterized by capitula arranged in spikes or head-like clusters, few hermaphroditic central florets, tr...

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Autores principales: Urtubey, Estrella, López, Alicia Beatriz, Chemisquy, Maria Amelia, Anderberg, Arne A., Baeza, Carlos M., Bayón, Néstor David, Deble, Leonardo Paz, Moreira-Muñoz, Andrés, Nesom, Guy L., Alford, Mac H., Salomón, Luciana, Freire, Susana Edith
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Agrarias
Gamochaetopsis
Omalotheca
Stuckertiella
ETS
ITS
trnL-F
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/133379
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-133379
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Agrarias
Gamochaetopsis
Omalotheca
Stuckertiella
ETS
ITS
trnL-F
spellingShingle Ciencias Agrarias
Gamochaetopsis
Omalotheca
Stuckertiella
ETS
ITS
trnL-F
Urtubey, Estrella
López, Alicia Beatriz
Chemisquy, Maria Amelia
Anderberg, Arne A.
Baeza, Carlos M.
Bayón, Néstor David
Deble, Leonardo Paz
Moreira-Muñoz, Andrés
Nesom, Guy L.
Alford, Mac H.
Salomón, Luciana
Freire, Susana Edith
New circumscription of the genus <i>Gamochaeta</i> (Asteraceae, Gnaphalieae) inferred from nuclear and plastid DNA sequences
topic_facet Ciencias Agrarias
Gamochaetopsis
Omalotheca
Stuckertiella
ETS
ITS
trnL-F
description <i>Gamochaeta</i> (tribe Gnaphalieae, Asteraceae) is composed of ca. 60 species primarily distributed in tropical and subtropical America. Within the tribe Gnaphalieae, the genus is characterized by capitula arranged in spikes or head-like clusters, few hermaphroditic central florets, truncate style branches with apical sweeping trichomes, pappus bristles connate at the base into a ring falling as a unit, and achenes with globose twin trichomes. Previous molecular phylogenetic studies have suggested the paraphyly of the genus, but have not provided a basis for redefining generic limits due to incomplete taxon sampling. To address this problem, DNA sequences from the plastid (trnL-F) and nuclear (ETS and ITS) genomes were analyzed from a broad taxon sample representing the full range of morphological variation known in the genus. Our results affirm that <i>Gamochaeta</i> is paraphyletic as presently circumscribed. Two clades can be recognized: one clade that includes the majority of the species currently assigned to <i>Gamochaeta</i> and a second clade that includes <i>Gamochaetopsis</i>, <i>Stuckertiella</i> and seven species of <i>Gamochaeta</i>. We present here a new circumscription of <i>Gamochaeta</i>, including two new combinations, <i>Gamochaeta alpina</i> and <i>Gamochaeta peregrina</i>, and the resurrection of <i>Gamochaeta capitata</i>. Our results also show <i>Omalotheca supina</i>, <i>O. norvegica</i> and <i>O. sylvatica</i>, which were placed by some authors in <i>Gamochaeta</i> or in <i>Gnaphalium</i>, form a monophyletic group distantly related to both genera.
format Articulo
Articulo
author Urtubey, Estrella
López, Alicia Beatriz
Chemisquy, Maria Amelia
Anderberg, Arne A.
Baeza, Carlos M.
Bayón, Néstor David
Deble, Leonardo Paz
Moreira-Muñoz, Andrés
Nesom, Guy L.
Alford, Mac H.
Salomón, Luciana
Freire, Susana Edith
author_facet Urtubey, Estrella
López, Alicia Beatriz
Chemisquy, Maria Amelia
Anderberg, Arne A.
Baeza, Carlos M.
Bayón, Néstor David
Deble, Leonardo Paz
Moreira-Muñoz, Andrés
Nesom, Guy L.
Alford, Mac H.
Salomón, Luciana
Freire, Susana Edith
author_sort Urtubey, Estrella
title New circumscription of the genus <i>Gamochaeta</i> (Asteraceae, Gnaphalieae) inferred from nuclear and plastid DNA sequences
title_short New circumscription of the genus <i>Gamochaeta</i> (Asteraceae, Gnaphalieae) inferred from nuclear and plastid DNA sequences
title_full New circumscription of the genus <i>Gamochaeta</i> (Asteraceae, Gnaphalieae) inferred from nuclear and plastid DNA sequences
title_fullStr New circumscription of the genus <i>Gamochaeta</i> (Asteraceae, Gnaphalieae) inferred from nuclear and plastid DNA sequences
title_full_unstemmed New circumscription of the genus <i>Gamochaeta</i> (Asteraceae, Gnaphalieae) inferred from nuclear and plastid DNA sequences
title_sort new circumscription of the genus <i>gamochaeta</i> (asteraceae, gnaphalieae) inferred from nuclear and plastid dna sequences
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/133379
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