Home LiteratureArticle Details
PMID: 15500466 Published · ppublish English Journal Article Research Support, U.S. Gov't, Non-P.H.S.

Sequence composition, organization, and evolution of the core Triticeae genome.

The Plant journal : for cell and molecular biology ·Vol. 40 ·No. 4 ·2004-11-00 ·Pages 500-11

Li W, Zhang P, Fellers JP, Friebe B, Gill BS

Abstract

We investigated the composition and the basis of genome expansion in the core Triticeae genome using Aegilops tauschii, the D-genome donor of bread wheat. We sequenced an unfiltered genomic shotgun (trs) and a methylation-filtration (tmf) library of A. tauschii, and analyzed wheat expressed sequence tags (ESTs) to estimate the expression of genes and transposable elements (TEs). The sampled D-genome sequences consisted of 91.6% repetitive elements, 2.5% known genes, and 5.9% low-copy sequences of unknown function. TEs constituted 68.2% of the D-genome compared with 50% in maize and 14% in rice. The DNA transposons constituted 13% of the D-genome compared with 2% in maize. TEs were methylated unevenly within and among elements and families, and most were transcribed which contributed to genome expansion in the core Triticeae genome. The copy number of a majority of repeat families increased gradually following polyploidization. Certain TE families occupied discrete chromosome territories. Nested insertions and illegitimate recombination occurred extensively between the TE families, and a majority of the TEs contained internal deletions. The GC content varied significantly among the three sequence sets examined ranging from 42% in tmf to 46% in trs and 52% in the EST. Based on enrichment of genic sequences, methylation-filtration offers one option, although not as efficient as in maize, for isolating gene-rich regions from the large genome of wheat.

MeSH Terms
Edible Grain/genetics Evolution, Molecular Genes, Plant Genome, Plant Genomics Molecular Sequence Data Multigene Family Polyploidy
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Li Wanlong
Department of Plant Pathology and Wheat Genetics Resource Center, Kansas State University, Manhattan, KS 66506, USA.
Zhang Peng
Fellers John P
Friebe Bernd
Gill Bikram S
Article Info
Journal
The Plant journal : for cell and molecular biology
Abbr.
Plant J
ISSN
0960-7412
Published
2004-11-00
Pages
500-11
Language
English
Region
England
NLM ID
9207397
Subset
IM
Databases
GENBANK
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