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Media type:
E-Article
Title:
Meiotic events inOenothera — a non-standard pattern of chromosome behaviour
Contributor:
Golczyk, Hieronim;
Musiał, Krystyna;
Rauwolf, Uwe;
Meurer, Jörg;
Herrmann, Reinhold G.;
Greiner, Stephan
Published:
Canadian Science Publishing, 2008
Published in:
Genome, 51 (2008) 11, Seite 952-958
Language:
English
DOI:
10.1139/g08-081
ISSN:
1480-3321;
0831-2796
Origination:
Footnote:
Description:
The genus Oenothera shows an intriguing extent of permanent translocation heterozygosity. Reciprocal translocations of chromosome arms in species or populations result in various kinds of chromosome multivalents in diakinesis. Early meiotic events conditioning such chromosome behaviour are poorly understood. We found a surprising uniformity of the leptotene–diplotene period, regardless of the chromosome configuration at diakinesis (ring of 14, 7 bivalents, mixture of bivalents and multivalents). It appears that the earliest chromosome interactions at Oenothera meiosis are untypical, since they involve pericentromeric regions. During early leptotene, proximal chromosome parts cluster and form a highly polarized Rabl configuration. Telomeres associated in pairs were seen at zygotene. The high degree of polarization of meiotic nuclei continues for an exceptionally long period, i.e., during zygotene–pachytene into the diplotene contraction stage. The Rabl-polarized meiotic architecture and clustering of pericentromeres suggest a high complexity of karyotypes, not only in structural heterozygotes but also in bivalent-forming homozygous species.