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Molecular phylogenetics and morphological evolution of Thunbergioideae (Acanthaceae)

Borg, Agneta Julia LU ; McDade, Lucinda A. and Schönenberger, Jürg (2008) In Taxon 57(3). p.811-822
Abstract

Based on nucleotide sequences from three chloroplast DNA regions (rps16, rpl16, trnT-trnL), we infer detailed phylogenetic relationships within the subfamily Thunbergioideae (Acanthaceae) and among major lineages of the family as a whole. Taxa were sampled to cover the geographic distribution of Thunbergioideae and to include all subgenera of the largest genus Thunbergia. All other major lineages of Acanthaceae were sampled to test monophyly and intrafamilial position of Thunbergioideae. Both parsimony and Bayesian analyses support Thunbergioideae as monophyletic. The mangrove genus Avicennia is consistently placed as sister to Thunbergioideae although with only moderate support. Thunbergia and Mendoncia are both monophyletic in all... (More)

Based on nucleotide sequences from three chloroplast DNA regions (rps16, rpl16, trnT-trnL), we infer detailed phylogenetic relationships within the subfamily Thunbergioideae (Acanthaceae) and among major lineages of the family as a whole. Taxa were sampled to cover the geographic distribution of Thunbergioideae and to include all subgenera of the largest genus Thunbergia. All other major lineages of Acanthaceae were sampled to test monophyly and intrafamilial position of Thunbergioideae. Both parsimony and Bayesian analyses support Thunbergioideae as monophyletic. The mangrove genus Avicennia is consistently placed as sister to Thunbergioideae although with only moderate support. Thunbergia and Mendoncia are both monophyletic in all analyses, and Mendoncia is placed as sister to Thunbergia plus Pseudocalyx. Relationships within the two largest genera Mendoncia and Thunbergia are highly resolved and most branches are strongly supported. Our results suggest that the existing morphology-based classification of Thunbergia partially holds, but needs revision. Based on the phylogenetic relationships we found it likely that a twining habit is ancestral for the genus Thunbergia. The thecal awns, characteristic for many species in the genus, have probably evolved from unicellular bristles. Longitudinal dehiscence over the whole length of the thecae, which is present in many Thunbergia species, most likely evolved from short slits or pores as present in Pseudocalyx and Mendoncia.

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author
; and
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Acanthaceae, Chloroplast DNA, Morphology, Phylogeny, Thunbergioideae
in
Taxon
volume
57
issue
3
pages
12 pages
publisher
International Association for Plant Taxonomy
external identifiers
  • scopus:51349162226
ISSN
0040-0262
DOI
10.1002/tax.573012
language
English
LU publication?
no
id
a38ad893-974f-4399-a377-2550ba700aa4
date added to LUP
2023-03-09 14:38:17
date last changed
2023-03-15 12:48:25
@article{a38ad893-974f-4399-a377-2550ba700aa4,
  abstract     = {{<p>Based on nucleotide sequences from three chloroplast DNA regions (rps16, rpl16, trnT-trnL), we infer detailed phylogenetic relationships within the subfamily Thunbergioideae (Acanthaceae) and among major lineages of the family as a whole. Taxa were sampled to cover the geographic distribution of Thunbergioideae and to include all subgenera of the largest genus Thunbergia. All other major lineages of Acanthaceae were sampled to test monophyly and intrafamilial position of Thunbergioideae. Both parsimony and Bayesian analyses support Thunbergioideae as monophyletic. The mangrove genus Avicennia is consistently placed as sister to Thunbergioideae although with only moderate support. Thunbergia and Mendoncia are both monophyletic in all analyses, and Mendoncia is placed as sister to Thunbergia plus Pseudocalyx. Relationships within the two largest genera Mendoncia and Thunbergia are highly resolved and most branches are strongly supported. Our results suggest that the existing morphology-based classification of Thunbergia partially holds, but needs revision. Based on the phylogenetic relationships we found it likely that a twining habit is ancestral for the genus Thunbergia. The thecal awns, characteristic for many species in the genus, have probably evolved from unicellular bristles. Longitudinal dehiscence over the whole length of the thecae, which is present in many Thunbergia species, most likely evolved from short slits or pores as present in Pseudocalyx and Mendoncia.</p>}},
  author       = {{Borg, Agneta Julia and McDade, Lucinda A. and Schönenberger, Jürg}},
  issn         = {{0040-0262}},
  keywords     = {{Acanthaceae; Chloroplast DNA; Morphology; Phylogeny; Thunbergioideae}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{811--822}},
  publisher    = {{International Association for Plant Taxonomy}},
  series       = {{Taxon}},
  title        = {{Molecular phylogenetics and morphological evolution of Thunbergioideae (Acanthaceae)}},
  url          = {{http://dx.doi.org/10.1002/tax.573012}},
  doi          = {{10.1002/tax.573012}},
  volume       = {{57}},
  year         = {{2008}},
}