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Chromosome pairing in meiosis of partially fertile wheat/rye hybrids

Content Provider	Springer Nature Link
Author	Silkova, O. G. Adonina, I. G. Krivosheina, E. A. Shchapova, A. I. Shumny, V. K.
Copyright Year	2012
Abstract	The normal course of meiosis depends on regular pairing of homologous chromosomes. In intergeneric hybrids, including those of wheat, there is no chromosome pairing because there are no homologs. In F1 wheat/rye hybrids, pairing is largely prevented by the pairing homoeologous1 (Ph1) gene. In its presence, there are only rare instances of pairing; most chromosomes are univalent, and their orientation at metaphase I initiates different pathways of the meiotic cycle. The meiotic-like pathway includes a combination of the reductional and the equational + reductional steps at AI followed by the second division. The resulting gametes are mostly non-functional. The mitotic-like pathway involves equational division of univalents at AI and the absence of the second division. Any fertility of wheat/rye hybrids depends on the production of unreduced gametes arising from meiotic restitution (mitotic-like division). We examined the meiotic pairing in wheat/rye hybrids created from wheat lines with single rye chromosome substitutions and Ph1 present. This guaranteed F1 meiosis with one pair of rye homologs. All hybrids formed bivalents, but proportions of meiocytes with bivalents varied. In the meiocytes where bivalents were present, there was a higher tendency for the meiotic-like pathway, while in meiocytes where bivalent pairing failed, the tendency was stronger for the mitotic-like pathway. Among the equationally dividing cells, we observed more than 90 % of meiocytes without bivalents, where rye homologs did not form bivalents, too. The data indicate a potential application of wheat/rye lines in producing genetic stocks of amphidiploids with designated genomic constitutions.
Starting Page	33
Ending Page	41
Page Count	9
File Format	PDF
ISSN	21947953
Journal	Plant Reproduction
Volume Number	26
Issue Number	1
e-ISSN	21947961
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-12-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Univalent division Meiosis Bivalent formation Wheat/rye substitution Partially fertile wheat/rye hybrids Cell Biology Plant Sciences Agriculture
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science

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