Comparative FISH karyotype analysis of 11 Picea species

DOI Web Site 被引用文献6件 参考文献12件

説明

The spruce, genus Picea is distributed throughout Eurasia and North America. Because all Picea species have the same chromosome number (2n=24) and very similar karyotypes, comparative karyotype analysis using traditional staining methods is difficult or impossible. Fluorescent in situ hybridization (FISH) with probes of 45S rDNA, 5S rDNA, and Sau3A repetitive family is reported a powerful tool for comparative karyotype analysis in some species of Picea. We report here FISH karyotypes in 11 Picea species and compare them each other. Comparative FISH karyotyping clarified the interspecific relationships of eight Eurasian and seven North American species. Eurasian species displayed conservative FISH karyotypes, while North American species showed variable FISH signal patterns. Two American species, P. rubens and P. mariana, were very similar to Eurasian species in FISH karyotype. We discuss the differences at each FISH signal site and compare the interspecific relationships of FISH karyotypes to molecular phylogenetic trees reported in Picea.

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