[Karyological characteristics of Abies sibirica in the Middle Siberia].

Data on Abies sibirica karyotype structure have been obtained in five populations of Middle Siberia. Chromosome set (2n = 24) consists of 7 pairs of metacentric (I--VII), 4 pairs of submetacentric (VIII, X-XII) and a pair of intercentric (IX) chromosomes. Morphometric parameters of chromosome groups are similar in the populations studied. Variation of Abies sibirica chromosome characteristics is low. Intraspecific chromosome polymorphism of A. sibirica is substantially connected with variation of the number of NOR-chromosome in the karyotype and with location of NOR in chromosome arms. Mixoploidy, somatic reduction of chromosomes, and a triploid seedling of A. sibirica have been registered on the territory with antropogenic press.