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Theoretical and Applied Genetics

, Volume 107, Issue 4, pp 591–597 | Cite as

Karyotype of Norway spruce by multicolor FISH

  • M. Vischi
  • I. Jurman
  • G. Bianchi
  • M. Morgante
Article

Abstract.

The chromosomes (2n = 2x = 24) of Norway spruce are very large since their size reflects the huge amount of genomic DNA (2C = 30 × 109 bp). However, the identification of homologous pairs is hampered by their high degree of similarity at the morphological level. Data so far presented in the literature were not sufficient to solve all the ambiguities in chromosome identification. Several genomic Norway spruce DNA clones containing highly repetitive sequences have been identified and characterised in our laboratory. Three of them were selected for fluorescent in situ hybridization (FISH) experiments because of their strong signals and suitability for chromosome identification: PATR140 hybridized at the centromeric site of three chromosome pairs; PAF1 hybridized in six subtelomeric and two centromeric sites; 1PABCD6 co-localized with the subtelomeric sites identified by PAF1. The statistical analysis of microscopic measurements of chromosomes in combination with the FISH signals of these probes allowed the unambigous construction of Norway spruce karyotype. We also compared the karyotype of Norway spruce with that of other spruce species to infer the number and kind of rearrangements that have occurred during the evolution of these species.

Keywords.

Norway spruce Picea abies Repetitive DNA FISH Karyotype 

Notes

Acknowledgements.

We thank Federica Cattonaro for kindly providing the 1PABCD6 probe. This work was supported by the European Union grant BIO4 CT-972125.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Dipartimento di Produzione Vegetale e Tecnologie Agrarie, Via delle Scienze 208, 33100 Udine, Italy

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