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Citation for Study 22240

About Citation title: "Plastid genomes reveal recurrent formation of allopolyploid Fragaria.".
About Study name: "Plastid genomes reveal recurrent formation of allopolyploid Fragaria.".
About This study is part of submission 22240 (Status: Published).


Dillenberger M.S., Wei N., Tennessen J.A., Ashman T., & Liston A. 2018. Plastid genomes reveal recurrent formation of allopolyploid Fragaria. American Journal of Botany, 105(5): 1-13.


  • Dillenberger M.S.
  • Wei N.
  • Tennessen J.A.
  • Ashman T.
  • Liston A.


PREMISE OF THE STUDY Recurrent formation of polyploid taxa is a common observation in many plant groups. Haploid, cytoplasmic genomes like the plastid genome can be used to overcome the problem of homeologous genes and recombination in polyploid taxa. Fragaria (Rosaceae) contains several octo- and decaploid species. We use plastome sequences to infer the plastid ancestry of these taxa with special focus on the decaploid Fragaria cascadensis. METHODS We used genome skimming of 96 polyploid Fragaria samples on a single Illumina HiSeq 3000 lane to obtain whole plastome sequences. These sequences were used for phylogenetic reconstructions and dating analyses. Ploidy of all samples was inferred with flow cytometry and plastid inheritance was examined in a controlled cross of F. cascadensis. KEY RESULTS The plastid genome phylogeny shows that only the octoploid F. chiloensis is monophyletic, all other polyploid taxa were supported to be para- or polyphyletic. The decaploid Fragaria cascadensis has biparental plastid inheritance and four different plastid donors. Diversification of the F. cascadensis clades occurred in the last 230,000 years. The southern part of its distribution range harbors considerably higher genetic diversity, suggestive of a potential refugium. CONCLUSIONS Fragaria cascadensis originated at least four times from parents with different plastomes. In contrast, para- and polyphyletic taxa of the octoploid Fragaria species are best explained by incomplete lineage sorting and/or hybridization. Biogeographic patterns in F. cascadensis are probably a result of range shift during the last glacial maximum.


allopolyploid; biparental plastid inheritance; Fragaria cascadensis; genome skimming; independent origins; paternal leakage; plastome; refugia; Rosaceae

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