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This book describes how the genome sequence contributes to our
understanding of allopolyploidisation and the genome evolution,
genetic diversity, complex trait regulation and knowledge-based
breeding of this important crop. Numerous examples demonstrate how
widespread homoeologous genome rearrangements and exchanges have
moulded structural genome diversity following a severe polyploidy
bottleneck. The allopolyploid crop species Brassica napus has the
most highly duplicated plant genome to be assembled to date, with
the largest number of annotated genes. Examples are provided for
use of the genome sequence to identify and capture diversity for
important agronomic traits, including seed quality and disease
resistance. The increased potential for detailed gene discovery
using high-density genetic mapping, quantitative genetics and
transcriptomic analyses is described in the context of genome
availability and illustrated with recent examples. Intimate
knowledge of the highly-duplicated gene space, on the one hand, and
the repeat landscape on the other, particularly in comparison to
the two diploid progenitor genomes, provide a fundamental basis for
new insights into the regulatory mechanisms that are coupled with
selection for polyploid success and crop evolution.
This book describes how the genome sequence contributes to our
understanding of allopolyploidisation and the genome evolution,
genetic diversity, complex trait regulation and knowledge-based
breeding of this important crop. Numerous examples demonstrate how
widespread homoeologous genome rearrangements and exchanges have
moulded structural genome diversity following a severe polyploidy
bottleneck. The allopolyploid crop species Brassica napus has the
most highly duplicated plant genome to be assembled to date, with
the largest number of annotated genes. Examples are provided for
use of the genome sequence to identify and capture diversity for
important agronomic traits, including seed quality and disease
resistance. The increased potential for detailed gene discovery
using high-density genetic mapping, quantitative genetics and
transcriptomic analyses is described in the context of genome
availability and illustrated with recent examples. Intimate
knowledge of the highly-duplicated gene space, on the one hand, and
the repeat landscape on the other, particularly in comparison to
the two diploid progenitor genomes, provide a fundamental basis for
new insights into the regulatory mechanisms that are coupled with
selection for polyploid success and crop evolution.
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