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Originally published as Genetics Published Articles Ahead of Print on September 1, 2006.
Genetics, Vol. 174, 1583-1596, November 2006, Copyright © 2006
doi:10.1534/genetics.106.064071
Mapping PrBn and Other Quantitative Trait Loci Responsible for the Control of Homeologous Chromosome Pairing in Oilseed Rape (Brassica napus L.) Haploids
Zhiqian Liu*,
Katarzyna Adamczyk
,
Maria Manzanares-Dauleux*,
Frédérique Eber*,
Marie-Odile Lucas*,
Régine Delourme*,
Anne Marie Chèvre* and
Eric Jenczewski*,
,1
* UMR INRA–Agrocampus Rennes, Amélioration des Plantes et Biotechnologies Végétales, 35653 Le Rheu Cedex, France, Unité de Mathématique et Informatique Appliquées, INRA, 78352 Jouy en Josas, France and Station de Génétique et Amélioration des Plantes, INRA–Institut Jean Pierre Bourgin, 78026 Versailles Cedex, France
1 Corresponding author: Station de Génétique et Amélioration des Plantes, INRA–Institut Jean Pierre Bourgin, Rte. de Saint-Cyr, 78026 Versailles Cedex, France.
E-mail: ejenczewski{at}versailles.inra.fr
In allopolyploid species, fair meiosis could be challenged by homeologous chromosome pairing and is usually achieved by the action of homeologous pairing suppressor genes. Oilseed rape (Brassica napus) haploids (AC, n = 19) represent an attractive model for studying the mechanisms used by allopolyploids to ensure the diploid-like meiotic pairing pattern. In oilseed rape haploids, homeologous chromosome pairing at metaphase I was found to be genetically based and controlled by a major gene, PrBn, segregating in a background of polygenic variation. In this study, we have mapped PrBn within a 10-cM interval on the C genome linkage group DY15 and shown that PrBn displays incomplete penetrance or variable expressivity. We have identified three to six minor QTL/BTL that have slight additive effects on the amount of pairing at metaphase I but do not interact with PrBn. We have also detected a number of other loci that interact epistatically, notably with PrBn. Our results support the idea that, as in other polyploid species, metaphase I homeologous pairing in oilseed rape haploids is controlled by an integrated system of several genes, which function in a complex manner.
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