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Mitochondrial DNA variation pattern and postglacial history of the Siberian larch (<Emphasis Type="Italic">Larix sibirica</Emphasis> Ledeb.)
Authors:V L Semerikov  A I Iroshnikov  M Lascoux
Institution:(1) Institute of Plant and Animal Ecology, Ural Division, Russian Academy of Sciences, ul. Vos’mogo Marta 202, Yekaterinburg, 620144, Russia;(2) Research Institute of Forest Genetics and Breeding, ul. Lomonosova 105, Voronezh, 394087, Russia;(3) University of Uppsala, Norbyvagen 18D, Uppsala, 75236, Sweden
Abstract:Mitochondrial DNA (mtDNA) variation has been studied in populations of the Siberian larch with the use of five PCR-based markers characterizing 29 haplotypes. The studied populations from the main parts of the Siberian larch range belong to several geographically isolated groups with their specific sets of haplotypes, which have probably originated from separate refugia for forest vegetation of the last glacial maximum. Conclusions concerning the possible location of these refugia and the ways and pattern of the postglacial recolonization of the recent Siberian larch range are drawn. The spatial distribution of haplotypes within individual populations is nonrandom. The typical size of the area occupied by a group of plants with the same haplotype is 50–100 m across.
Keywords:Siberian larch  phylogeography  mitochondrial DNA  glacial refugia  Northern Eurasia  Pleistocene  Holocene
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