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|Title: ||Dispersals of Hyoscyameae and Mandragoreae (Solanaceae) from the New World to Eurasia in the early Miocene and their biogeographic diversification within Eurasia|
|Authors: ||Tu, Tieyao|
Dillon, Michael O.
|Issue Date: ||2010|
|Series/Report no.: ||Molecular Phylogenetics and Evolution;57|
|Abstract: ||The cosmopolitan Solanaceae contains 21 tribes and has the greatest diversity in South America.
Hyoscyameae and Mandragoreae are the only tribes of this family distributed exclusively in Eurasia
with two centers of diversity: the Mediterranean–Turanian (MT) region and the Tibetan Plateau (TP).
In this study, we examined the origins and biogeographical diversifications of the two tribes based
on the phylogenetic framework and chronogram inferred from a combined data set of six plastid
DNA regions (the atpB gene, the ndhF gene, the rps16-trnK intergenic spacer, the rbcL gene, the trnCpsbM
region and the psbA-trnH intergenic spacer) with two fossil calibration points. Our data suggest
that Hyoscyameae and Mandragoreae each forms a monophyletic group independently derived from
different New World lineages in the early Miocene. Phylogenetic relationships within both tribes are
generally well resolved. All genera of Hyoscyameae are found to be monophyletic and they diversified
in middle to late Miocene. At nearly the same time, Mandragoreae split into two clades, corresponding
to the MT region and the TP region, respectively. Both the phylogenetic relationships and the estimated
ages of Hyoscyameae and Mandragoreae support two independent dispersal events of their ancestors
from the New World into Eurasia. After their arrivals in Eurasia, the two tribes diversified primarily
in the MT region and in the TP region via multiple biogeographic processes including vicariance, dispersal,
recolonization or being preserved as relicts, from the mid Miocene to the late Quaternary|
|Description: ||Molecular Phylogenetics and Evolution, 57 (2010) 1226-1237|
|Appears in Collections:||Department of Botany|
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