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Genome-wide sequence information reveals recurrent hybridization among diploid wheat wild relatives
Bernhardt, Nadine1,5,6; Brassac, Jonathan1; Dong, Xue2,3; Willing, Eva-Maria2; Poskar, C. Hart1; Kilian, Benjamin1,4; Blattner, Frank R.1
Corresponding AuthorBernhardt, Nadine( ; Blattner, Frank R.(
Source PublicationPLANT JOURNAL
AbstractMany conflicting hypotheses regarding the relationships among crops and wild species closely related to wheat (the genera Aegilops, Amblyopyrum, and Triticum) have been postulated. The contribution of hybridization to the evolution of these taxa is intensely discussed. To determine possible causes for this, and provide a phylogeny of the diploid taxa based on genome-wide sequence information, independent data were obtained from genotyping-by-sequencing and a target-enrichment experiment that returned 244 low-copy nuclear loci. The data were analyzed using Bayesian, likelihood and coalescent-based methods. D statistics were used to test if incomplete lineage sorting alone or together with hybridization is the source for incongruent gene trees. Here we present the phylogeny of all diploid species of the wheat wild relatives. We hypothesize that most of the wheat-group species were shaped by a primordial homoploid hybrid speciation event involving the ancestral Triticum and Am. muticum lineages to form all other species except Ae. speltoides. This hybridization event was followed by multiple introgressions affecting all taxa except Triticum. Mostly progenitors of the extant species were involved in these processes, while recent interspecific gene flow seems insignificant. The composite nature of many genomes of wheat-group taxa results in complicated patterns of diploid contributions when these lineages are involved in polyploid formation, which is, for example, the case for tetraploid and hexaploid wheats. Our analysis provides phylogenetic relationships and a testable hypothesis for the genome compositions in the basic evolutionary units within the wheat group of Triticeae.
Keywordphylogenomics hybridization introgression Triticum Aegilops Amblyopyrum crop wild relatives genotyping-by-sequencing nuclear single-copy genes target enrichment
Indexed BySCI ; SCI
WOS Research AreaPlant Sciences
WOS SubjectPlant Sciences
WOS IDWOS:000516861100001
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorBernhardt, Nadine; Blattner, Frank R.
Affiliation1.Leibniz Inst Plant Genet & Crop Plant Res IPK, D-06466 Gatersleben, Germany
2.Max Planck Inst Plant Breeding Res, D-50829 Cologne, Germany
3.Chinese Acad Sci, Kunming Inst Bot, Germplasm Bank Wild Species, Plant Germplasm & Genom Ctr, Kunming 650201, Yunnan, Peoples R China
4.Global Crop Div Trust, D-53113 Bonn, Germany
5.German Ctr Integrat Biodivers Res iDiv, D-04103 Leipzig, Germany
6.Julius Kuhn Inst, D-06484 Quedlinburg, Germany
Recommended Citation
GB/T 7714
Bernhardt, Nadine,Brassac, Jonathan,Dong, Xue,et al. Genome-wide sequence information reveals recurrent hybridization among diploid wheat wild relatives[J]. PLANT JOURNAL,2020:14.
APA Bernhardt, Nadine.,Brassac, Jonathan.,Dong, Xue.,Willing, Eva-Maria.,Poskar, C. Hart.,...&Blattner, Frank R..(2020).Genome-wide sequence information reveals recurrent hybridization among diploid wheat wild relatives.PLANT JOURNAL,14.
MLA Bernhardt, Nadine,et al."Genome-wide sequence information reveals recurrent hybridization among diploid wheat wild relatives".PLANT JOURNAL (2020):14.
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