Inter- and intra-genomic homology of the Brassica genomes: Implications for their origin and evolution
Inter- and intra-genomic homology of the Brassica genomes: Implications for their origin and evolution
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DOI：
10.1007/bf00223454
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发表时间：
1996-12-01
影响因子：
5.4
通讯作者：
Quiros, CF
中科院分区：
文献类型：
--
作者：
Truco, MJ;Hu, J;Quiros, CF
为了确定栽培芸苔属植物基因组的同源区域，构建了二倍体栽培B. rapa（A基因组，n = 10），B. nigra（B基因组，n = 8）和B. oleracea（C基因组，n = 9）进行比较。我们发现了基因组间的保守区域，但基因组之间有广泛的重排。来自所有三个物种的18个连锁群可以根据至少三个共同标记的同源片段相关联。还观察到A、B和C基因组的一些染色体的基因组内同源保守。一个可能的染色体系统发育途径的基础上的祖先基因组至少有五个，不超过七个染色体，从观察到的染色体相互关系。这些结果表明，广泛的重复和重排已参与形成芸苔属基因组从一个较小的祖先基因组。
In order to determine the homologous regions shared by the cultivated Brassica genomes, linkage maps of the diploid cultivated B. rapa (A genome, n = 10), B. nigra (B genome, n = 8) and B. oleracea (C genome, n = 9), were compared. We found intergenomic conserved regions but with extensive reordering among the genomes. Eighteen linkage groups from all three species could be associated on the basis of homologous segments based on at least three common markers. Intragenomic homologous conservation was also observed for some of the chromosomes of the A, B and C genomes. A possible chromosome phylogenetic pathway based on an ancestral genome of at least five, and no more than seven chromosomes, was drawn from the chromosomal inter-relationships observed. These results demonstrate that extensive duplication and rearrangement have been involved in the formation of the Brassica genomes from a smaller ancestral genome.