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Title: Origin of wheat B-genome chromosomes inferred from RNA sequencing analysis of leaf transcripts from section Sitopsis species of Aegilops
Authors: Miki, Yuka
Yoshida, Kentaro
Mizuno, Nobuyuki
Nasuda, Shuhei  kyouindb  KAKEN_id
Sato, Kazuhiro
Takumi, Shigeo
Author's alias: 那須田, 周平
Keywords: chromosomal synteny
genome-wide polymorphisms
genome differentiation
RNA sequencing
Issue Date: Apr-2019
Publisher: Oxford University Press (OUP)
Journal title: DNA research : an international journal for rapid publication of reports on genes and genomes
Volume: 26
Issue: 2
Start page: 171
End page: 182
Abstract: Dramatic changes occasionally occur in intergenic regions leading to genomic alterations during speciation and will consequently obscure the ancestral species that have contributed to the formation of allopolyploid organisms. The S genome of five species of section Sitopsis of genus Aegilops is considered to be an origin of B-genome in cultivated tetraploid and hexaploid wheat species, although its actual donor is still unclear. Here, we attempted to elucidate phylogenetic relationship among Sitopsis species by performing RNA sequencing of the coding regions of each chromosome. Thus, genome-wide polymorphisms were extensively analyzed in 19 accessions of the Sitopsis species in reference to the tetraploid and hexaploid wheat B genome sequences and consequently were efficiently anchored to the B-genome chromosomes. The results of our genome-wide exon sequencing and resultant phylogenetic analysis indicate that Ae. speltoides is likely to be the direct donor of all chromosomes of the wheat B genome. Our results also indicate that the genome differentiation during wheat allopolyploidization from S to B proceeds at different speeds over the chromosomes rather than at constant rate and recombination could be a factor determining the speed. This observation is potentially generalized to genome differentiation during plant allopolyploid evolution.
Rights: © The Author(s) 2019. Published by Oxford University Press on behalf of Kazusa DNA Research Institute. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
DOI(Published Version): 10.1093/dnares/dsy047
PubMed ID: 30715317
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