Stock-specific differences in the number and chromosome positions of the nucleolar organizer regions in arctic char (Salvelinus alpinus)

Stock-specific variation in the number and chromosome locations of the nucleolar organizer regions (NORs) was found in North American and European stocks of arctic char ( Salvelinus alpinus) using chromomycin A 3 staining and silver staining. The number of NORs varied from two to eight per diploid g...

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Bibliographic Details
Published in:Cytogenetic and Genome Research
Main Authors: Phillips, R.B., Pleyte, K.A., Hartley, S.E.
Format: Article in Journal/Newspaper
Language:English
Published: S. Karger AG 1988
Subjects:
Arctic
Salvelinus alpinus
Online Access:http://dx.doi.org/10.1159/000132576
https://www.karger.com/Article/Pdf/132576
Description
Summary:Stock-specific variation in the number and chromosome locations of the nucleolar organizer regions (NORs) was found in North American and European stocks of arctic char ( Salvelinus alpinus) using chromomycin A 3 staining and silver staining. The number of NORs varied from two to eight per diploid genome. An unusual pattern of one NOR consistently present on both members of the largest submetacentric chromosome pair and additional NORs with variable locations was found. These findings suggest that NORs are being transposed to new chromosome sites in this species and this is discussed in relation to similar findings in other Salvelinus species and in amphibians.

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