Abstract:
:Immunocytochemical and electron microscopic analysis of synaptonemal complexes (SCs) was carried out for the first time in homozygotes and complex Robertsonian heterozygotes (hybrids) of the common shrew, Sorex araneus Linnaeus, 1758, from a newly discovered hybrid zone between the Moscow and the Neroosa chromosomal races. These races differ in four monobrachial homologous metacentrics, and closed SC tetravalent is expected to be formed in meiosis of a hybrid. Indeed, such a multivalent was found at meiotic prophase I in hybrids. Interactions between multivalent and both autosomes and/or the sex chromosomes were observed. For the first time we have used immunocytochemical techniques to analyse asynapsis in Sorex araneus and show that the multivalent pairs in an orderly fashion with complete synapsis. Despite some signs of spermatocytes arrested in the meiotic prophase I, hybrids had large number of active sperm. Thus, Moscow - Neroosa hybrid males that form a ring-of-four meiotic configuration are most likely not sterile. Our results support previous demonstrations that monobrachial homology of metacentrics of the common shrew does not lead to complete reproductive isolation between parapatric chromosomal races of the species.
journal_name
Comp Cytogenetjournal_title
Comparative cytogeneticsauthors
Matveevsky SN,Pavlova SV,Maret M Acaeva,Oxana L Kolomietsdoi
10.3897/CompCytogen.v6i3.3701subject
Has Abstractpub_date
2012-09-14 00:00:00pages
301-14issue
3eissn
1993-0771issn
1993-078Xjournal_volume
6pub_type
杂志文章abstract::Chromosome morphometry and nuclear DNA content are useful data for cytotaxonomy and to understand the evolutionary history of different taxa. For the genus Bromus Linnaeus, 1753, distinct ploidy levels have been reported, occurring from diploid to duodecaploid species. The geographic distribution of Bromus species has...
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abstract::[This corrects the article DOI: 10.3897/CompCytogen.v14i2.49513.]. ...
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pub_type: 已发布勘误
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journal_title:Comparative cytogenetics
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journal_title:Comparative cytogenetics
pub_type: 杂志文章,评审
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更新日期:2020-10-22 00:00:00
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journal_title:Comparative cytogenetics
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更新日期:2016-12-09 00:00:00
abstract::[This corrects the article DOI: 10.3897/CompCytogen.v11i1.10339.]. ...
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更新日期:2017-12-08 00:00:00