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The transcriptional landscape of polyploid wheat.
Science 361 (2018)
The coordinated expression of highly related homoeologous genes in polyploid species underlies the phenotypes of many of the world's major crops. Here we combine extensive gene expression datasets to produce a comprehensive, genome-wide analysis of homoeolog expression patterns in hexaploid bread wheat. Bias in homoeolog expression varies between tissues, with similar to 30% of wheat homoeologs showing nonbalanced expression. We found expression asymmetries along wheat chromosomes, with homoeologs showing the largest inter-tissue, inter-cultivar, and coding sequence variation, most often located in high-recombination distal ends of chromosomes. These transcriptionally dynamic genes potentially represent the first steps toward neo- or subfunctionalization of wheat homoeologs. Coexpression networks reveal extensive coordination of homoeologs throughout development and, alongside a detailed expression atlas, provide a framework to target candidate genes underpinning agronomic traits in wheat.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Whole-genome Duplication; Body Dna Methylation; Gene-expression; Plants; Evolution; Arabidopsis; Domestication; Divergence; Resistance; Dominance
ISSN (print) / ISBN
0036-8075
e-ISSN
1095-9203
Journal
Science
Quellenangaben
Volume: 361,
Issue: 6403
Publisher
American Association for the Advancement of Science (AAAS)
Publishing Place
1200 New York Ave, Nw, Washington, Dc 20005 Usa
Non-patent literature
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Reviewing status
Peer reviewed