Skip to main content

Plant taxonomy and biosystematics — does DNA provide all the answers?

Buy Article:

$14.47 plus tax (Refund Policy)

The impact of molecular systematics, especially DNA sequences, on plant taxonomy and biosystematics has been fundamental and era-splitting. It has led to reactions by researchers ranging from advocating that it is now the only kind of research worth pursuing to considering molecular data as merely another body of evidence to be utilised equally with all the others. Can DNA "lie"? What reasons might there be to question the veracity of what it appears to tell us about plant evolution? This paper is an attempted discussion on the extent to which we can afford to rely solely upon DNA sequences to unravel the evolution of and relationships between plants, and on the principles underlying our utilisation of DNA data in making taxonomic decisions. The main topics visited are: interpretation of chloroplast DNA and rDNA ITS sequences in polyploids in the light of maternal inheritance and concerted evolution; importance of "traditional" characters such as crossability and chromosomal homology as revealed by DNA evidence; desirability of insisting on a monophyletic classification; effects of sample-size on phylogenetic analyses; and the suitability for evolutionary studies of a molecule composed of only four different elements in terms of likely levels of homoplasy. Special reference is made to recent phylogenetic analyses of festucoid grasses, especially the genus Vulpia, where it is proposed that the obvious "misplacement" of certain polyploid species can actually be used to infer their parentage.
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: FESTUCA; HOMOPLASY; HYBRIDISATION; LATERAL TRANSFER; MOLECULAR SYSTEMATICS; MONOPHYLY; PHYLOGENY; POLYPLOIDY; PSILURUS; VULPIA

Document Type: Research Article

Affiliations: Department of Biology, University of Leicester, Leicester LE1 7RH, U.K.

Publication date: 2005-11-01

  • 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
X
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