SUMMARY. A comparative study of karyotypes of two Siberian species of larch – L. sibirica and L. gmelinii, growing in the zone of forest-tundra on the Taimyr Peninsula was carried out. An analysis of the number of chromosomes has been carried out and the increase in chromosomal instability in larches in forest-tundra conditions has been shown. The size and morphology of chromosomes, localization and frequency of secondary constrictions in chromosomes of L. sibirica and L. gmelinii were estimated. The parameters of chromosomes in polyploid cells of L. gmelinii were studied. The asymmetry of karyotypes of L. sibirica and L. gmelinii was analyzed. The spectrum and frequency of chromosome rearrangements in L. sibirica and L. gmelinii were studied. Using the data of the karyological analysis, the issues of differentiation and adaptation of the investigated larch species in Taimyr are discussed.
Keywords: Taimyr peninsula, Larix sibirica, Larix gmelinii, karyological analysis, asymmetry of karyotypes, chromosome rearrangements
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