Genetic variation and differentiation of Yeddo spruce populations in Russia
2003
Potenko, V.V.,Forestry Breeding and Seed Production Center, Sosnovka (Russian Federation). Department of Genetics and Breeding | Knysh, Y.D.
Genetic diversity and genetic differentiation of eight populations of Yeddo spruce (Picea jezoensis (Sieb. et Zucc.) Carr.) from the Russian Far East mainland and one from the Kamchatka Peninsula were studied analyzing allozyme variation in 20 loci. The mean number of alleles per locus (A) was 2.63, the percent of polymorphic loci (P) was 88.1%, the observed heterozygosity (Ho) was 0.181 and the mean value of expected heterozygosity (He) amounted to 0.189 for eight mainland populations. The values of expected heterozygosity of the northern and central mainland populations were higher than in the southern part of the natural range. Regional differences in genetic variability could be due to genetic drift in the southern populations in the middle Holocene when warmer temperatures caused an upward elevational shift of spruce populations, resulting in small, isolated populations. Only 2.4% of the total genetic variability can be attributed to variation among mainland populations. The values of genetic variation in the Kamchatka Peninsula population were different from those in the mainland populations: A = 1.85, P = 70.0, He = 0.241. Unbiased Nei's genetic distance values (DN) were low between the mainland populations of P. jezoensis and averaged 0.006. The largest values were revealed between the mainland populations and the Kamchatka Peninsula population (at average, DN = 0.081) that were similar to the genetic distances observed between closely related conifer species.
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