Oreshkova N. V. Intraspecific Genetic Differentiation of the Cajanderi Larch (Larix cajanderi) in the North-East Asia
Cajanderi larch (Larix cajanderi), markers of a nuclear genome, allelic variants, genetic structure, intraspecific differentiation
AbstractHow to cite: Oreshkova N. V. Intraspecific genetic differentiation of the Cajanderi larch (Larix cajanderi) in the North-East Asia // Sibirskij Lesnoj Zurnal (Siberian Journal of Forest Science). 2014. N. 4: 92–98 (in Russian with English abstract).
© Oreshkova N. V., 2014
The study of intraspecific genetic differentiation of the Cajanderi larch (Larix cajanderi Mayr.) was carried out in the north-east of Asia – in Magadan region and on the Kamchatka Peninsula. Genetic diversity of the larch was investigated using eight nuclear microsatellite loci (bcLK056, bcLK066, bcLK224, bcLK232, bcLK260, bcLK235, UAKLly6, UBCLXtet-1-22). The highest levels of genetic variability parameters were detected in the population of L. cajanderi in Magadan region (NA = 4.531; NE = 2.624; HO = 0.528; HE= 0.523). In the Kamchatka populations this parameters were NA = 3.489; NE = 2,030; HO = 0.383; HE = 0.440. Overall, the obtained values for the main indicators of genetic polymorphism demonstrate a fairly high average level of genetic diversity in the Cajanderi larch in the Far North-East of Asia (NA = 3.767; NE = 2.191; HO = 0.422; HE = 0.463).Significant genetic differences between L. cajanderi samples from Magadan region and Kamchatka (FST = 0.117; DN = 0.362) suggests early isolation of the larch on the peninsula. Deficiency of heterozygote genotypes was revealed in all investigated larch populations in Kamchatka, related to high degree of inbreeding (F = 0.138). Excess of heterozygote genotypes was observed in the Magadan populations of L. cajanderi (F = –0.029), which was probably due to the action of balancing selection in favor of heterozygotes.