Linked Life Data

3691187

Source:http://linkedlifedata.com/resource/pubmed/id/3691187

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3-4
pubmed:dateCreated
1988-2-12
pubmed:abstractText
Mitotic analyses of the brook trout (Salvelinus fontinalis) x arctic char (S. alpinus) hybrids (sparctic trout) revealed a mode of 2n = 82 with 18 metacentric and 64 acrocentric chromosomes. The brook trout had 2n = 84 with 16 metacentric chromosomes and the arctic char had 2n = 80 with 20 metacentric chromosomes; both species are derivatives of a single tetraploid event. Variable multivalent-like configurations that may be centromeric associations of bivalents were observed in C-banded pachytene figures of female sparctic trout. Metaphase I analyses of sparctic trout males indicated that two fusions of nonhomologous acrocentric chromosomes representing two duplicated chromosome sets must have occurred in the arctic char after its evolutionary divergence from the brook trout. A mode of seven tetravalent rods per cell suggests that preferential multivalent pairing occurs in the sparctic hybrid; metaphase I analyses of S. alpinus males revealed a mode of only five tetravalent rods per cell. The presence of multivalents implies that the arctic char, like the brook trout, is still undergoing diploidization. Cytochemical detection of the nucleolar organizer region (NOR) revealed intra- and interspecific as well as intraindividual variability in the numbers and types of chromosomes (metacentric or acrocentric) on which NORs appeared in arctic char and sparctic trout. Brook trout only had NORs on acrocentric chromosomes. This may indicate that different chromosomal fusions occurred in the evolution of brook trout from arctic char.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:issn
0301-0171
pubmed:author
pubmed:issnType
Print
pubmed:volume
45
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
196-205
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
Cytogenetic analyses of a Salvelinus hybrid reveal an evolutionary relationship between the parental species.
pubmed:affiliation
Department of Biology, Pennsylvania State University, University Park.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, Non-P.H.S.