title: Silver-banded karyotypes of the rainbow trout and the brook trout and their hybrids: disappearance in allotriploids of Ag-NORs originated from the brook trout.
abstract: Silver-banded karyotypes of the rainbow trout Salmo gairdneri, the brook trout Salvelinus fontinalis, and their hybrids were described. Diploid-type and triploid-type hybrids were obtained. Triploid-type hybrids had two maternal genomes of the rainbow trout and one paternal genome of the brook trout. The rainbow trout had one pair of M or SM with Ag-NORs near the satellite. In the brook trout, Ag-NORs were observed in four pairs of chromosomes, but each cell had different number of chromosomes with Ag-NORs. In all observed cells of triploid-type hybrids, Ag-NORs originated from the brook trout were not recognized, whereas those from the rainbow trout were found.
authors.affiliation: Department of Biology, Faculty of Education, Utsunomiya University.
authors.forename: T
authors.initials: T
authors.lastname: Ueda
authors.forename: R
authors.initials: R
authors.lastname: Sato
authors.forename: J
authors.initials: J
authors.lastname: Kobayashi
mesh_terms: D000818:Animals; D002871:Chromosome Banding; D004171:Diploidy; D005260:Female; D006824:Hybridization, Genetic / Q000235:genetics*; D007621:Karyotyping; D008297:Male; D009697:Nucleolus Organizer Region; D011123:Polyploidy; D012487:Salmonidae / Q000235:genetics*; D012834:Silver; D014337:Trout / Q000235:genetics*
chemical_list: D012834:Silver