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PMID: 17028342 Published · ppublish English Journal Article Research Support, U.S. Gov't, Non-P.H.S.

Types and rates of sequence evolution at the high-molecular-weight glutenin locus in hexaploid wheat and its ancestral genomes.

Genetics ·Vol. 174 ·No. 3 ·2006-11-00 ·Pages 1493-504

Gu YQ, Salse J, Coleman-Derr D, Dupin A, Crossman C, Lazo GR, Huo N, Belcram H, Ravel C, Charmet G, Charles M, Anderson OD, Chalhoub B

Abstract

The Glu-1 locus, encoding the high-molecular-weight glutenin protein subunits, controls bread-making quality in hexaploid wheat (Triticum aestivum) and represents a recently evolved region unique to Triticeae genomes. To understand the molecular evolution of this locus region, three orthologous Glu-1 regions from the three subgenomes of a single hexaploid wheat species were sequenced, totaling 729 kb of sequence. Comparing each Glu-1 region with its corresponding homologous region from the D genome of diploid wheat, Aegilops tauschii, and the A and B genomes of tetraploid wheat, Triticum turgidum, revealed that, in addition to the conservation of microsynteny in the genic regions, sequences in the intergenic regions, composed of blocks of nested retroelements, are also generally conserved, although a few nonshared retroelements that differentiate the homologous Glu-1 regions were detected in each pair of the A and D genomes. Analysis of the indel frequency and the rate of nucleotide substitution, which represent the most frequent types of sequence changes in the Glu-1 regions, demonstrated that the two A genomes are significantly more divergent than the two B genomes, further supporting the hypothesis that hexaploid wheat may have more than one tetraploid ancestor.

MeSH Terms
Base Sequence/genetics DNA, Intergenic DNA, Plant/analysis Evolution, Molecular Genome, Plant Glutens/chemistry,genetics Molecular Sequence Data Molecular Weight Polyploidy Retroelements Sequence Analysis, DNA Synteny Triticum/genetics
Chemicals
DNA, Intergenic DNA, Plant Retroelements Glutens glutenin
Authors & Affiliations
13 authors, click to expand affiliations / ORCID
Gu Yong Qiang
United States Department of Agriculture-Agricultural Research Service, Western Regional Research Center, Albany, CA 94710, USA. [email protected]
Salse Jérôme
Coleman-Derr Devin
Dupin Adeline
Crossman Curt
Lazo Gerard R
Huo Naxin
Belcram Harry
Ravel Catherine
Charmet Gilles
Charles Mathieu
Anderson Olin D
Chalhoub Boulos
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Article Info
Journal
Genetics
Abbr.
Genetics
ISSN
0016-6731
DOI
10.1534/genetics.106.060756
Email
[email protected]
Published
2006-11-00
Epub
2006-00-08
Pages
1493-504
Language
English
Region
United States
NLM ID
0374636
PMCID
PMC1667099
Subset
IM
Databases
GENBANK
DQ537335, DQ537336, DQ537337
External Links
PubMed source DOI: 10.1534/genetics.106.060756 PMC Full Text View journal details
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