Heterochromatins and band karyotypes in three species of salmonids |
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Authors: | B Mayr M Kalat P Rab |
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Institution: | (1) Institute for Animal Breeding and Genetics, Veterinary University, A-1030 Vienna, Austria;(2) Ludwig Boltzmann Institute for Immuno- and Cytogenetic Research, Veterinary University, A-1030 Vienna, Austria;(3) Department of Genetics, Czechoslovak Academy of Sciences, Institute for Animal Physiology and Genetics, CS-277 21 Libechov, Czechoslovakia |
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Abstract: | Summary The heterochromatins of rainbow trout (Salmo gairdneri R.), brown trout (Salmo trutta fario L.) and brook trout (Salvelinus fontinalis M.) were characterized by sequential chromomycin A3/distamycin A/DAPI (CDD) and DAPI/actinomycin D (DAPI/AmD) fluorescence. On most biarmed chromosomes, an equilocal localization of prominent DAPI/AmD positive, chromomycin A3 negative, AT-rich blocks at the centromeres were observed in all three species. Band karyotypes of the three species were established. In rainbow trout, several DAPI/AmD positive heterochromatin blocks behaved positive in a silver-staining method. Mitotic and interphase studies proved the presence of inter-individual NOR variation in brown trout. The NORs of brook trout were localized on chromosomes 5, 10, 14, 15 and 29. |
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Keywords: | Heterochromatin DAPI/actinomycin D Salmo gairdneri R Salmo trutta fario L Salvelinus fontinalis M |
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