Genome organization in dicots. II. Arabidopsis as a 'bridging species' to resolve genome evolution events among legumes

被引:64
作者
Lee, JM
Grant, D
Vallejos, CE
Shoemaker, RC [1 ]
机构
[1] Iowa State Univ, Dept Agron, Ames, IA 50011 USA
[2] Iowa State Univ, USDA ARS, Corn Insect & Crop Genet Res Grp, Ames, IA 50011 USA
[3] Univ Florida, Dept Hort Sci, Gainesville, FL 32611 USA
[4] Univ Florida, Plant Mol & Cellular Biol Program, Gainesville, FL 32611 USA
关键词
soybean; arabidopsis; Phaseolus; Vigna; evolution; paleopolyploid; genome duplication;
D O I
10.1007/s001220100658
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Analysis of molecular linkage groups within the soybean (Glycine max L. Merr.) genome reveals many homologous regions, reflecting the ancient polyploidy of soybean. The fragmented arrangement of the duplicated regions suggests that extensive rearrangements, as well as additional duplications, have occurred since the initial polyploidization event. In this study we used comparisons between homoeologous regions in soybean, and the homologous regions in the related diploids Phaseolus vulgaris and Vigna radiata, to elucidate the evolutionary history of the three legume genomes. Our results show that there is not only conservation of large regions of the genomes but that these conserved linkage blocks are also represented twice in the soybean genome. To gain a better understanding of the process of genome evolution in dicots, molecular comparisons have been extended to another well-studied species, Arabidopsis thaliana. Interestingly, the conserved regions we identified in the legume species are also relatively conserved in Arabidopsis. Our results suggest that there is conservation of blocks of DNA between species as distantly related as legumes and brassicas, representing 90 million years of divergence. We also present evidence for an additional, presumably earlier, genome duplication in soybean. These duplicated regions were only recognized by using Arabidopsis as a 'bridging' species in the genome comparisons.
引用
收藏
页码:765 / 773
页数:9
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