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PMID: 9799273 Published · ppublish English Comparative Study Journal Article Research Support, Non-U.S. Gov't

Comparative mapping between Arabidopsis thaliana and Brassica nigra indicates that Brassica genomes have evolved through extensive genome replication accompanied by chromosome fusions and frequent rearrangements.

Genetics ·Vol. 150 ·No. 3 ·1998-11-00 ·Pages 1217-28

Lagercrantz U

Abstract

Chromosome organization and evolution in the Brassicaceae family was studied using comparative linkage mapping. A total of 160 mapped Arabidopsis thaliana DNA fragments identified 284 homologous loci covering 751 cM in Brassica nigra. The data support that modern diploid Brassica species are descended from a hexaploid ancestor, and that the A. thaliana genome is similar in structure and complexity to those of each of the hypothetical diploid progenitors of the proposed hexaploid. Thus, the Brassica lineage probably went through a triplication after the divergence of the lineages leading to A. thaliana and B. nigra. These duplications were also accompanied by an exceptionally high rate of chromosomal rearrangements. The average length of conserved segments between A. thaliana and B. nigra was estimated at 8 cM. This estimate corresponds to approximately 90 rearrangements since the divergence of the two species. The estimated rate of chromosomal rearrangements is higher than any previously reported data based on comparative mapping. Despite the large number of rearrangements, fine-scale comparative mapping between model plant A. thaliana and Brassica crops is likely to result in the identification of a large number of genes that affect important traits in Brassica crops.

MeSH Terms
Arabidopsis/genetics Brassica/genetics Chromosome Mapping DNA Replication DNA, Plant/genetics Gene Rearrangement Genome, Plant Species Specificity
Chemicals
DNA, Plant
Authors & Affiliations
1 authors, click to expand affiliations / ORCID
Lagercrantz U
Department of Plant Biology, Swedish University of Agricultural Sciences, S-750 07 Uppsala, Sweden. ulf.lagercrantz@vbiol.slu.se
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Article Info
Journal
Genetics
Abbr.
Genetics
ISSN
0016-6731
DOI
10.1093/genetics/150.3.1217
Email
ulf.lagercrantz@vbiol.slu.se
Published
1998-11-00
Pages
1217-28
Language
English
Region
United States
NLM ID
0374636
PMCID
PMC1460378
Subset
IM
External Links
PubMed source DOI: 10.1093/genetics/150.3.1217 PMC Full Text View journal details
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