Phylogenetic Relationships ofDiploxylonPines (SubgenusPinus) Based on Plastid Sequence Data

The plastid DNA sequences ofrbcL,matK, thetrnV intron, and therpl20‐rps18 spacer in 38 species of subgenusPinus, representing all recognized subsections, were analyzed. Combined data sets of 3230 bp were used to assess relationships with maximum parsimony, neighbor joining, and maximum likelihood al...

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Bibliographic Details
Published in:International journal of plant sciences 2002-09, Vol.163 (5), p.737-747
Main Authors: Geada López, Gretel, Kamiya, Koichi, Harada, Ko
Format: Article
Language:English
Subjects:
Biological taxonomies
Confidence limits
Endemic species
Fossils
Introns
Nucleotides
Phylogenetics
Phylogeny
Research universities
Taxa
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Summary:The plastid DNA sequences ofrbcL,matK, thetrnV intron, and therpl20‐rps18 spacer in 38 species of subgenusPinus, representing all recognized subsections, were analyzed. Combined data sets of 3230 bp were used to assess relationships with maximum parsimony, neighbor joining, and maximum likelihood algorithms. SubgenusPinussplits into two distinct lineages, corresponding to Eurasia and North America (“New World hard pines”). The Eurasian lineage differentiated into two clades: the Mediterranean pines, including the Himalayan pineP. roxburghii(subsectionsCanarienses,Halepenses, andPinaster), and subsectionPinus. Two North American pines,P. tropicalisandP. resinosa, are typical members of subsectionPinusbut are not closely related to each other. SubsectionContortaeoccupied the basal position in the “New World hard pines” followed by subsectionPonderosae. Of the remaining “New World hard pines” subsections,Attenuataewas a monophyletic group andOocarpae,Australes, andLeiophyllaewere poorly resolved. The eastern Cuban pines,P. cubensisandP. maestrensis, formed a subgroup withinAustrales.matK evolved much faster thanrbcL, and the noncoding regions evolved more slowly thanrbcL andmatK synonymous sites. The divergence times for each subsection were estimated from therbcL sequence data calibrated by fossil data.
ISSN:1058-5893
1537-5315
DOI:10.1086/342213