Crossover rate between homologous chromosomes and interference are regulated by the addition of specific unpaired chromosomes in Brassica
文献类型： 外文期刊
作者： Suay, Loreto 1 ; Zhang, Deshuang 1 ; Eber, Frederique 1 ; Jouy, Helene 1 ; Lode, Maryse 1 ; Huteau, Virginie 1 ; Corit 1 ;
作者机构： 1.INRA, UMR 1349, Inst Genet Environm & Protect Plantes, F-35653 Le Rheu, France
2.NERCV, BAAFS, BVRC, Beijing 100097, Peoples R China
3.CETIOM, F-78850 Thiverval Grignon, France
4.Univ Paris 11, AgroParisTech, INRA, CNRS,UMR0320, F-91190 Gif Sur Yvette, France
5.Univ Paris 11, AgroParisTech, INRA, CNRS,UMR03
关键词： Brassica;crossover rate;homologous recombination;interference;interspecific hybrids;polyploidy
期刊名称：NEW PHYTOLOGIST （ 影响因子：10.151； 五年影响因子：10.475 ）
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收录情况： SCI
摘要： Recombination is a major mechanism generating genetic diversity, but the control of the crossover rate remains a key question. In Brassica napus (AACC, 2n=38), we can increase the homologous recombination between A genomes in AAC hybrids. Hypotheses for this effect include the number of C univalent chromosomes, the ratio between univalents and bivalents and, finally, which of the chromosomes are univalents. To test these hypotheses, we produced AA hybrids with zero, one, three, six or nine additional C chromosomes and four different hybrids carrying 2n=32 and 2n=35 chromosomes. The genetic map lengths for each hybrid were established to compare their recombination rates. The rates were 1.4 and 2.7 times higher in the hybrids having C-6 or C-9 alone than in the control (0C). This enhancement reached 3.1 and 4.1 times in hybrids carrying six and nine C chromosomes, and it was also higher for each pair of hybrids carrying 2n=32 or 2n=35 chromosomes, with a dependence on which chromosomes remained as univalents. We have shown, for the first time, that the presence of one chromosome, C-9, affects significantly the recombination rate and reduces crossover interference. This result will have fundamental implications on the regulation of crossover frequency.
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