Abstract
Karyotypes of three Larix species (L. sibirica, L. gmelinii, and L. cajanderi) were analyzed using fluorescence in situ hybridization (FISH) with 45S and 5S ribosomal RNA gene probes and 4′,6-diamidino-2-phenylindole (DAPI) staining. Two major 45S ribosomal DNA (rDNA) loci (per haploid genome) have been observed in the intercalary regions of two metacentric chromosomes, III and IV, of L. sibirica; in addition to them, minor nucleolus organizing regions (NORs) were mapped in pericentromeric regions of chromosomes I, II, VI, and XII. Two closely related species, L. gmelinii and L. cajanderi, showed similar hybridization patterns; both species possessed an additional major locus of 45S rDNA in the distal region of the long arm of submetacentric chromosome VII that is absent in L. sibirica. Only one locus of the 5S rDNA was found in all larch species we studied; it was located in the distal region of the chromosome III short arm, which also carried the major NOR in the opposite arm. This chromosome containing major loci of the two ribosomal RNA gene families can serve as a marker of the genus Larix. The intra- and interspecific karyotype diversity in the genus Larix is discussed.
Abbreviations
- FISH:
-
Fluorescence in situ hybridization
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- SSC:
-
Saline-sodium citrate
- PBS:
-
Phosphate-buffered saline
- NOR:
-
Nucleolus organizing region
- rDNA:
-
Ribosomal DNA
- Mbp:
-
Million base pairs
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Acknowledgments
The authors thank Aleksander P. Isaev Ph.D. (Institute for Biological Problems of Cryolithozone SB RAS, Yakutsk), Alexey P. Barchenkov Ph.D. (V.N. Sukachev Institute of Forest SB RAS, Krasnoyarsk), and Candagdorj Jamiyansuren Ph.D. (Institute of Botany, Mongolian Academy of Sciences, Ulaanbaatar) for supplying the seed samples. This work was supported by grant no. 76 from the Integration Program of the Siberian Branch of the Russian Academy of Sciences and the Russian Foundation for Basic Research (Projects No. 11-04-00063 and 10-04-90780).
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Goryachkina, O.V., Badaeva, E.D., Muratova, E.N. et al. Molecular cytogenetic analysis of Siberian Larix species by fluorescence in situ hybridization. Plant Syst Evol 299, 471–479 (2013). https://doi.org/10.1007/s00606-012-0737-y
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DOI: https://doi.org/10.1007/s00606-012-0737-y