Authors: Suwabe, Keita; Morgan, Colin; Bancroft, Ian

Source: Genome, Volume 51, Number 3, March 2008 , pp. 169-176(8)

Publisher: NRC Research Press

Abstract:

An integrated linkage map between B. napus and B. rapa was constructed based on a total of 44 common markers comprising 41 SSR (33 BRMS, 6 Saskatoon, and 2 BBSRC) and 3 SNP/indel markers. Between 3 and 7 common markers were mapped onto each of the linkage groups A1 to A10. The position and order of most common markers revealed a high level of colinearity between species, although two small regions on A4, A5, and A10 revealed apparent local inversions between them. These results indicate that the A genome of Brassica has retained a high degree of colinearity between species, despite each species having evolved independently after the integration of the A and C genomes in the amphidiploid state. Our results provide a genetic integration of the Brassica A genome between B. napus and B. rapa. As the analysis employed sequence-based molecular markers, the information will accelerate the exploitation of the B. rapa genome sequence for the improvement of oilseed rape.

Une carte génétique intégrée combinant celles du B. napus et du B. rapa a été produite à l'aide de 44 marqueurs communs comprenant 41 SSR (33 BRMS, 6 Saskatoon et 2 BBSRC) et 3 indels. Entre 3 et 7 marqueurs communs ont été assignés à chacun des groupes de liaison A1 à A10. La position et l'ordre de la plupart des marqueurs communs ont révélé un fort degré de colinéarité entre les espèces, bien que deux petites régions situées sur A4, A5 et A10 aient affiché une apparente inversion locale. Ces résultats indiquent que le génome A du genre Brassica a conservé une grande colinéarité entre les espèces, malgré le fait que chacune des espèces ait évolué indépendamment suite à l'intégration des génomes A et C dans l'état amphidiploïde. Les résultats de ces travaux contribuent une intégration génétique du génome A entre le B. napus et le B. rapa. Comme l'analyse faisait appel à des marqueurs moléculaires de séquence connue, cette information va permettre d'accélérer l'exploitation du génome du B. rapa pour des fins d'amélioration génétique du colza.

Document Type: Research article

Publication date: 2008-03-01

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• From its inception in 1957, this international cytogenetics journal has catered to the research areas of the members of the Genetics Society of Canada; traditionally, these have included agriculture, entomology, genetics/cytogenetics, and evolutionary mechanisms. The contents of the journal have evolved as contributors developed new technologies and interests. A 20-member Editorial Board is composed of scientists from around the world. Reviews and commentary from respected experts are often featured.
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