Skip to main content

Systematics of Symphyotrichinae (Asteraceae: Astereae): Disagreements Between Two Nuclear Regions Suggest a Complex Evolutionary History

Buy Article:

$15.00 plus tax (Refund Policy)


The systematics of subtribe Symphyotrichinae were studied with sequence data from two nuclear regions: the 18S-26S nrDNA internal and external transcribed spacers (ITS and ETS) and the 5S nrDNA non-transcribed spacer. The primary objective was to use data from these two regions to resolve relationships among Almutaster, Psilactis, and Symphyotrichum. The combined ITS + ETS data and the 5S data were subjected to phylogenetic analyses using parsimony and Bayesian methods. Both datasets identified two major clades in Symphyotrichinae: one consisting of Almutaster, Psilactis, and Symphyotrichum subgenus Virgulus, and the other consisting of most other species of Symphyotrichum, including all species of S. subgenus Symphyotrichum. In addition, there were seven instances of disagreement between the ITS + ETS and 5S results. Assessments of these incongruences suggested that there have been three occurrences of reticulate evolution, involving six species of Symphyotrichum: 1) S. tenuifolium, 2) S. moranense + S. trilineatum, and 3) S. concolor + S. ericoides + S. pratense.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Keywords: 5S rDNA non-transcribed spacer, introgression, nuclear incongruence, Psilactis, reticulate evolution, Symphyotrichum

Document Type: Research Article

Publication date: 2012-07-01

More about this publication?
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more