[Fine spatial structure of allozyme genotypes in isolated population of pedunculate oak Quercus robur L. (Fagaceae)].

The extent and spatial pattern of genetic variation at polymorphic allozyme loci in a population of pedunculate oak Quercus robur from the Bashkir Transural region was investigated using autocorrelation analysis. In the plantation examined, statistically significant local concentration of most of the alleles in two-dimensional space was identified. The measures for protection of this small population located outside of the western border of the species range, in the mountain--steppe habitat, and characterized by specific gene pool, are suggested.

[Differentiation among populations of the Rhodiola iremelica Boriss. (Grassulaceae). in the Southern Urals].

Isoenzyme markers and polyacrylamide gel electrophoresis have been used to study the genetic structure of populations of Rhodiola iremelica Boriss. (Grassulaceae), a Southern Ural endemic protected by the state and included in the Red Data Book of Bashkortostan Republic. A relatively large genetic variation at the species level has been found. The subdivision among populations (F(ST) = 0.115) is higher than in most cross-pollination angiosperms. No consistent pattern has been observed in the spatial distribution of its genetic variation. The relatively high differentiation among samples of R. iremelica characterized by small effective population sizes, may be accounted for by genetic drift, inbreeding, and a restricted gene flow. To preserve the population gene pool, in situ protection of the species in nature is insufficient. It seems advisable to create synthetic populations ex situ and reintroduce them into nature.