Издания и издательства -> Russian Journal of Genetics [Россия, г. Москва]  (2)

Molecular Phylogenetic Analysis of the Genus Abies (Pinaceae) Based on the Nucleotide Sequence of Chloroplast DNA
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A phylogenetic study of firs (Abies Mill.) was conducted using nucleotide sequences of several chloroplast DNA regions with a total length of 5580 bp. The analysis included 37 taxa, which represented the main evolutionary lineages of the genus, and Keteleeria davidiana. According to phylogenetic re...construction, the Abies species were subdivided into six main groups, generally corresponding to their geographic distribu tion. The phylogenetic tree had three basal clades. All of these clades contained American species, and only one of them contained Eurasian species. The divergence time calibrations, based on paleobotanical data and the chloroplast DNA mutation rate estimates in Pinaceae, produced similar results. The age of diversification among the basal clades of the presentday Abies was estimated as the end of the Oligocene–beginning of Miocene. The age of the separation of Mediterranean firs from the Asian–North American branch corre sponds to the Miocene. The age of diversification within the young groups of Mediterranean, Asian, and “boreal” American firs (A. lasiocarpa, A. balsamea, A. fraseri) was estimated as the Pliocene—Pleistocene. Based on the phylogenetic reconstruction obtained, the most plausible biogeographic scenarios were sug gested. It is noted that the existing systematic classification of the genus Abies strongly contradicts with phy logenetic reconstruction and requires revision.
Подробнее Год издания: 2014
Genetic Differentiation of Spruce Populations in Northwest Russia According to the Results of Microsatellite Loci Analysis
Просмотров: 141 Rating Star
Analysis of the genetic diversity of the spruce populations in the northwest of the European part of Russia using microsatellite markers revealed two relatively isolated genetic clusters. One of them is com posed of trees that were identified as P. abies according to morphological traits. Another ...cluster unites spruces that were determined as P. obovata and P. fennica. The results of SSR analysis do not support the idea of the taxonomic independence of the hybridogeneous P. fennica species. The frequency of genotypes attributed to P. abies (according to the results of microsatellite markers) decreases significantly from south to north.
Подробнее Год издания: 2013