Phylogenetic and Biogeographic Diversification of Berberidaceae in the Northern Hemisphere
Abstract:Sequences of the chloroplast genes matK and rbcL and nuclear ribosomal ITS2 were used for phylogenetic analyses of Berberidaceae. Three major clades were recognized, corresponding to the chromosome base numbers x = 6, 7, and 8/10. Bongardia was sister to the clade containing Achlys and the Podophyllum group, which consists of Diphylleia, Sinopodophyllum, Podophyllum, and Dysosma. The estimated times of divergence of six disjunct genera between Eurasia and North America ranged from 7.5 ± 2.3 Ma to 1.0 ± 0.7 Ma. The intercontinental disjunct lineages of Berberidaceae may have originated in eastern Asia and then migrated to Europe and North America. However, long-distance dispersal may explain the distribution pattern of Achlys. Desert xerophytes of Berberidaceae in southwestern Asia originated in response to the advent of dry climate at different times; Bongardia diverged from its closest relatives at 46.5 ± 3.6 Ma, whereas Leontice differentiated from Gymnospermium at 10.3 ± 3.2 Ma.
Document Type: Regular Paper
Publication date: 2007-10-01
More about this publication?
- Systematic Botany is the scientific journal of the American Society of Plant Taxonomists and publishes four issues per year.
2011 Impact Factor: 1.517
2011 ISI Journal Citation Reports® Rankings: 87/190 - Plant Sciences
34/45 - Evolutionary Biology
- Editorial Board
- Information for Authors
- Submit a Paper
- Subscribe to this Title
- Membership Information
- Ingenta Connect is not responsible for the content or availability of external websites