Physical Map of Chromosome 3B

Physical Map of Chromosome 3B

The physical map of the wheat largest chromosome, 3B, was published in Science in October 2008, paving the way to sequence the 17–billion–base-pair hexaploid bread wheat genome.


Paux et al. (2008). A physical map of the 1-gigabase bread wheat chromosome 3B. Science, 322(5898), 101–104.


As the staple food for 35% of the world's population, wheat is one of the most important crop species. To date, sequence-based tools to accelerate wheat improvement are lacking. As part of the international effort to sequence the 17–billion–base-pair hexaploid bread wheat genome (2n = 6x = 42 chromosomes), we constructed a bacterial artificial chromosome (BAC)–based integrated physical map of the largest chromosome, 3B, that alone is 995 megabases. A chromosome-specific BAC library was used to assemble 82% of the chromosome into 1036 contigs that were anchored with 1443 molecular markers, providing a major resource for genetic and genomic studies. This physical map establishes a template for the remaining wheat chromosomes and demonstrates the feasibility of constructing physical maps in large, complex, polyploid genomes with a chromosome-based approach.

Modification date: 16 August 2023 | Publication date: 28 July 2021 | By: ic