Karyological Analysis of Larch (Larix sibirica Ledeb.) from Mongolia
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Abstract
This paper deals with the karyotype study on Larix sibirica from Mongolia. Diploid chromosome number was established (2n = 24). Karyotype included 6 pairs (I-VI) of metacentric chromosomes and 6 pairs (VII-XII) of submetacentric chromosomes. Secondary constrictions were observed in eight chromosomes; interphase nuclei included from 1 to 8 nucleoli. Size of chromosomes of the first group is 12,8 mm, size of the chromosomes of the second group is 8,5 mm. Karyotype formula of L. sibirica from Mongolia is 2Msc+2M+2Msc+1Smsc+1Sm+4Smsc. Chromosomes of this species was analyzed using fluorescence in situ hybridization (FISH) with 45S and 5S ribosomal RNA gene probes. Mixoploidy and chromosome irregularities such as ring chromosomes are occurred.
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