در آسياي صغير و اروپا )FAGUS SPP( از جمعيت هاي راش )FAGUS ORIENTALIS( مطالعه تمايز ژنتيكي راشستان هاي خزري

Genetic Differentiation of Caspian Beech (Fagus orientalis)Forests from Europian and Asian Minor Beech (Fagus spp.)Stands

Genetic structure of Fagus orientalis Lipsky was investigated in 14 populations along the distribution range of this species in Hyrcanian zone through 12 Isozyme Ioci. Results were compared with 160 beech populations from potative species F. taurica, F. moesiaca, and Eurupian beech F. sylvatica. Mean allelic frequencies in oriental beech of Iran, in comparison with other beeches indicated that there were very few alleles, which are specific for one or few adjacent regions, so that alleles MDHA/A and GOT-B/Aʹ were observed just in Iran. There were some clinal variations found in allelic profiles. The frequency of the slowly migrating allele, MDH-a/E, almost absent in the west, increases towards the East up to more than 40% in Alborz Mts. There is no concordance between the trends of genetic diversity and multiplicity. Alborz Mts., in spite of low diversity is the most diffrentiated region. Considerable genetic differentiation in Iran beech forests, originated from tertiary, emphasised the fact that conservation of these unique forest types is not only important as a guarantee for biological diversity, resistance against climate changes, but also as gene reserves for revival of the degraded ecosystems. Conservation of these forests amounts to the conservation of thousands of years in evolutionary processes of environmental adaptability.