[Karyological features of the Siberan spruce Obovata ledeb. from various locations]

Results of karyological study of the Siberian spruce from different provenances are presented. A comparative idiogramm for the Siberian spruce from Krasnoyarsk Territory and the Khakass Autonomous Region was constructed. In addition to the typical chromosome number (2n = 24), the Siberian spruce has one or two B-chromosomes (2n = 24 + 1B; 2n = 24 + 2B). Hereditary transmission of B-chromosomes and their behaviour in mitosis have been studied. It is supposed that B-chromosomes of the Siberian spruce have a nucleolar-organizing ability.