Plant Systematics and Evolution

, Volume 179, Issue 3–4, pp 141–153 | Cite as

Phylogenetic analysis of pines using ribosomal DNA restriction fragment length polymorphisms

  • Diddahally Govindaraju
  • Paul Lewis
  • Christopher Cullis
Article

Abstract

Phylogenetic relationships among 30 species of the genusPinus were studied using restriction site polymorphism in the large subunit of nuclear rDNA. Of the 58 restriction sites scored, 48 were phylogenetically informative, and the 30 species reduced to ten taxa when species with identical restriction site patterns were combined. These ten taxa corresponded to the currently recognized subsections of the genus, with the sole exception ofP. leiophylla, which was identical in its pattern of restriction sites to all three species included from subsect.Oocarpae despite its being in a different section of subg.Pinus (Pinea instead ofPinus). A measure of the proportion of phylogenetic information contained within the data set (Homoplasy Excess Ratio, or HER) revealed that the character states were significantly non-randomly distributed among the ten taxa (HER = 0.71, p < 0.01). Branchand-bound searches using either Wagner or Dollo parsimony as the optimization criterion were carried out using PAUP in order to estimate phylogenetic relationships among the ten taxa. Three taxa (Picea pungens, Tsuga canadensis, andLarix decidua) were used independently as outgroups for purposes of rooting the trees. Despite the extreme differences in the assumptions underlying the Wagner and Dollo parsimony, the two gave surprisingly similar estimates of phylogeny, with both analyses supporting the monophyly of the two major subgeneraPinus andStrobus and differing in topology only in the placement of subsect.Ponderosae within subg.Pinus. The likelihood for the Wagner tree was only slightly higher than that computed for the Dollo tree.

Key words

Gymnosperms Conifers Pinaceae Pinus rDNA restriction fragments molecular systematics evolution phylogeny 

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • Diddahally Govindaraju
    • 1
  • Paul Lewis
    • 2
  • Christopher Cullis
    • 1
  1. 1.Department of BiologyCase Western Reserve UniversityClevelandUSA
  2. 2.Department of StatisticsNorth Carolina State UniversityRaleighUSA

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