Characterizing the composition and evolution of homoeologous genomes in hexaploid wheat through BAC-end sequencing on chromosome 3B
type: Dataset
contact point: Organization
  fn: CCSD
keyword: journal-articles
keyword: bac-end-sequencing
keyword: structure-du-genome
keyword: wheat
keyword: sdvgengpllife-sciences-q-biogeneticsplants-genetics
keyword: molecular-markers
keyword: homoeologous-genome-evolution
keyword: b-genome
keyword: genome-composition
keyword: infoeu-reposemanticsarticle
landing page: 0960-7412
description: Bread wheat (Triticum aestivum) is one of the most important crops worldwide. However, because of its large, hexaploid, highly repetitive genome it is a challenge to develop efficient means for molecular analysis and genetic improvement in wheat. To better understand the composition and molecular evolution of the hexaploid wheat homoeologous genomes and to evaluate the potential of BAC-end sequences (BES) for marker development, we have followed a chromosome-specific strategy and generated 11 Mb of random BES from chromosome 3B, the largest chromosome of bread wheat. The sequence consisted of about 86% of repetitive elements, 1.2% of coding regions, and 13% remained unknown. With 1.2% of the sequence length corresponding to coding sequences, 6000 genes were estimated for chromosome 3B. New repetitive sequences were identified, including a Triticineae-specific tandem repeat (Fat) that represents 0.6% of the B-genome and has been differentially amplified in the homoeologous genomes before polyploidization. About 10% of the BES contained junctions between nested transposable elements that were used to develop chromosome-specific markers for physical and genetic mapping. Finally, sequence comparison with 2.9 Mb of random sequences from the D-genome of Aegilops tauschii suggested that the larger size of the B-genome is due to a higher content in repetitive elements. It also indicated which families of transposable elements are mostly responsible for differential expansion of the homoeologous wheat genomes during evolution. Our data demonstrate that BAC-end sequencing from flow-sorted chromosomes is a powerful tool for analysing the structure and evolution of polyploid and highly repetitive genomes.
issued: 2026-05-05T21:39:44.835615
language: en
modified: 2026-05-05T21:39:44.835620

Characterizing the composition and evolution of homoeologous genomes in hexaploid wheat through BAC-end sequencing on chromosome 3B
type: Distribution
access URL: https://hal.science/hal-00964354
format: HTML
issued: 2026-05-05T21:39:44.889184
modified: 2026-05-05T21:39:44.805635

test_moissonnage_selune
type: Agent