Early allopolyploid evolution in the post-neolithic Brassica napus oilseed genome

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DOIResolve DOI: http://doi.org/10.1126/science.1253435
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TypeArticle
Journal titleScience
ISSN0036-8075
Volume345
Issue6199
Pages950953; # of pages: 4
Subjectarticle; chromosome duplication; cytology; genetics; molecular evolution; plant genome; plant seed; polyploidy; rapeseed; Brassica napus; Chromosome Duplication; Evolution, Molecular; Genome, Plant; Polyploidy; Seeds
AbstractOilseed rape (Brassica napus L.) was formed ∼7500 years ago by hybridization between B. rapa and B. oleracea, followed by chromosome doubling, a process known as allopolyploidy. Together with more ancient polyploidizations, this conferred an aggregate 72x genome multiplication since the origin of angiosperms and high gene content.We examined the B. napus genome and the consequences of its recent duplication. The constituent An and Cn subgenomes are engaged in subtle structural, functional, and epigenetic cross-talk, with abundant homeologous exchanges. Incipient gene loss and expression divergence have begun. Selection in B. napus oilseed types has accelerated the loss of glucosinolate genes, while preserving expansion of oil biosynthesis genes. These processes provide insights into allopolyploid evolution and its relationship with crop domestication and improvement.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; Aquatic and Crop Resource Development
NoteErratum published in Vol 345, no. 6202 September 2014 DOI: 10.1126/science.1260782
Peer reviewedYes
NRC numberNRC-ACRD-56049
NPARC number21272762
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Record identifierfe675255-2695-4042-a736-97a04c55b3d4
Record created2014-12-03
Record modified2016-05-09
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