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Plant Systematics and Evolution

, Volume 188, Issue 3–4, pp 197–211 | Cite as

Chloroplast DNA-based phylogeny of AsianPinus species (Pinaceae)

  • Xiao-Ru Wang
  • Alfred E. Szmidt
Article

Abstract

The genusPinus includes over 90 species with approximately 24 species native to Asia. We have analyzed the chloroplast (cp) DNA variation of 18Pinus species, including 15 Asian, two Eurasian, and one European species using seven restriction enzymes and ten non-overlapping probes and inferred their phylogenetic relationships. Results of phenetic and cladistic approaches to phylogeny reconstruction were largely in agreement, suggesting two major lineages within the genus and confirmed the ancient character of haploxylon and diploxylon subgenera. Species from sectionParrya appear to have diverged earliest from the hypothesized phylogenetic centre for the haploxylon pines, withP. bungeana andP. gerardiana forming two basal, monotypic lineages. The range of estimated pairwise nucleotide substitutions per site (\(\mathop d\limits^ \sim \)) was higher among haploxylon pines than among diploxylon species. CpDNA divergence was found to be low within the sectionSylvestres, relative to the divergence among haploxylon species, suggesting that the radiation of this group of taxa from its common ancestor occurred after the diversification of other groups. The low cpDNA divergence in this subsection corroborated earlier evidence for its phylogenetic cohesiveness and existence as a monophyletic group.

Key words

Gymnosperms Pinaceae Pinus cpDNA variation molecular systematics evolution Flora of Eurasia 

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • Xiao-Ru Wang
    • 1
  • Alfred E. Szmidt
    • 1
  1. 1.Department of Forest Genetics and Plant PhysiologySwedish University of Agricultural SciencesUmeåSweden

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