Evidence for genetic association between East Asian and western North American Crataegus L. (Rosaceae) and rapid divergence of the eastern North American lineages based on multiple DNA sequences

Phylogeographic relationships were constructed for 72 Old and New World Crataegus species using combinations of four chloroplast and up to five nuclear regions. Maximum parsimony, maximum likelihood, and Bayesian results yield consistent relationships among major lineages. The close associations of...

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Bibliographic Details
Published in:Molecular phylogenetics and evolution 2009-05, Vol.51 (2), p.157-168
Main Authors: Lo, Eugenia Y.Y., Stefanović, Saša, Christensen, Knud Ib, Dickinson, Timothy A.
Format: Article
Language:English
Subjects:
Bayes Theorem
Beringian land bridge
Cell Nucleus - genetics
Crataegus
Crataegus - classification
Crataegus - genetics
Dispersal-vicariance
DNA, Chloroplast - genetics
DNA, Plant - genetics
East Asia–western North America disjunction
Evolution, Molecular
Far East
Genetic Speciation
Geography
Homoplasy
Hybrid origins
Likelihood Functions
North America
Phylogeny
Rapid divergence
Rosaceae
Sequence Alignment
Sequence Analysis, DNA
Topological incongruence
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Summary:Phylogeographic relationships were constructed for 72 Old and New World Crataegus species using combinations of four chloroplast and up to five nuclear regions. Maximum parsimony, maximum likelihood, and Bayesian results yield consistent relationships among major lineages. The close associations of the East Asian and western North American species point toward ancient trans-Beringian migrations. Relationships among eastern North American species are poorly resolved and few groups are identified that are congruent with existing classifications. Scant variation and short internal branches among these species suggest rapid divergence associated with polyploidy and hybridization. Incongruence between the chloroplast and nuclear data, and morphology suggest hybrid origins of three species from an extinct European lineage (the male parent) and three different North American female parents. Europe and eastern North America are suggested as the most recent common areas for Crataegus; at least four dispersal events are inferred to explain the present distribution of the genus.
ISSN:1055-7903
1095-9513
DOI:10.1016/j.ympev.2009.01.018