The karyotype of some rare species of Astragalus and Oxytropis (Fabaceae)
Abstract
The paper presents the results of a study of the karyotype of rare endemics: Astragalus chorinensis Bunge, Oxytropis glandulosa Turcz., O. stukovii Palibin, O. varlakovii Serg. On the basis of the data ideograms of chromosomes and karyotypes formulas are presented. The study showed that A. chorinensis somatic chromosome number was 2n = 16. The chromosomal formula is 2n = 2m + 14sm. The average of total length of the haploid chromosomes is 40.24 mm. The size of chromosomes varies from 4.29 ± 0.04 to 6.31 ± 0.06 microns. A. chorinensis is characterized by asymmetric karyotype with a predominance submetacentric chromosomes. Diploid set of chromosomes in O. glandulosa is 2n = 16. Chromosome formula is 2n = 16 = 4m + 12sm. Chromosomes are fairly uniform in size, the average length ranged from 1.56 ± 0.05 to 1.93 ± 0.09 m. The total length of the haploid chromosomes was 33.63 microns. For O. stukovii set chromosomal formula is 2n = 16 = 6m + 10sm. The total length of the haploid chromosomes (CL) was 33.74 microns. Chromosomes length ranges from 3.75 ± 0.10 m to 4.93 ± 0.14 m. O. varlakovii chromosomes are metacentric and submetacentric types. The chromosomal formula of 2n = 32 = 4m + 28sm. The size of chromosomes ranged from 0.74 ± 0.01 до 1.56 ± 0.15 microns. The total length of the haploid was 33.74 microns. O. stukovii, O. glandulosa and O. varlakovii are characterized by symmetrical karyotype with a predominance of metacentric chromosomes type.
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