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Originally published as Genetics Published Articles Ahead of Print on December 8, 2008.
Genetics, Vol. 181, 393-403, February 2009, Copyright © 2009
doi:10.1534/genetics.108.097469
Detailed Recombination Studies Along Chromosome 3B Provide New Insights on Crossover Distribution in Wheat (Triticum aestivum L.)
Cyrille Saintenac*,
Matthieu Falque
,
Olivier C. Martin
,
,
Etienne Paux*,
Catherine Feuillet* and
Pierre Sourdille*,1
* INRA-Université Blaise Pascal, UMR 1095, Genetic, Diversity and Ecophysiology of Cereals, 63100 Clermont-Ferrand, France, INRA and Université Paris-Sud, UMR 0320/UMR 8120 Génétique Végétale, 91190 Gif-sur-Yvette, France and Université Paris-Sud, UMR 8626 Laboratoire de Physique Théorique et Modèles Statistiques, 91400 Orsay, France
1 Corresponding author: UMR 1095, Genetic, Diversity and Ecophysiology of Cereals, Domaine de Crouël, 234 Ave. du Brézet, 63100 Clermont-Ferrand, France.
E-mail: pierre.sourdille{at}clermont.inra.fr
In wheat (Triticum aestivum L.), the crossover (CO) frequency increases gradually from the centromeres to the telomeres. However, little is known about the factors affecting both the distribution and the intensity of recombination along this gradient. To investigate this, we studied in detail the pattern of CO along chromosome 3B of bread wheat. A dense reference genetic map comprising 102 markers homogeneously distributed along the chromosome was compared to a physical deletion map. Most of the COs (90%) occurred in the distal subtelomeric regions that represent 40% of the chromosome. About 27% of the proximal regions surrounding the centromere showed a very weak CO frequency with only three COs found in the 752 gametes studied. Moreover, we observed a clear decrease of CO frequency on the distal region of the short arm. Finally, the intensity of interference was assessed for the first time in wheat using a Gamma model. The results showed m values of 1.2 for male recombination and 3.5 for female recombination, suggesting positive interference along wheat chromosome 3B.
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