4.8 Article

Tracing the Diploid Ancestry of the Cultivated Octoploid Strawberry

期刊

MOLECULAR BIOLOGY AND EVOLUTION
卷 38, 期 2, 页码 478-485

出版社

OXFORD UNIV PRESS
DOI: 10.1093/molbev/msaa238

关键词

Fragaria; chromosome-level genome; diploid progenitors; gene tree discordance; ILS and hybridization; sppIDer

资金

  1. National Key R&D Program of China [2019YFD1000201]
  2. Strategic Priority Research Program of Chinese Academy of Sciences [XDA13020604]

向作者/读者索取更多资源

By analyzing the genomes of five diploid strawberries, researchers identified F. iinumae and F. vesca as the diploid progenitors of the octoploid F. x ananassa, resolving conflicting hypotheses and establishing a reliable phylogeny for the Fragaria genus.
The commercial strawberry, Fragaria x ananassa, is a recent allo-octoploid that is cultivated worldwide. However, other than Fragaria vesca, which is universally accepted one of its diploid ancestors, its other early diploid progenitors remain unclear. Here, we performed comparative analyses of the genomes of five diploid strawberries, F. iinumae, F. vesca, F. nilgerrensis, F. nubicola, and F. viridis, of which the latter three are newly sequenced. We found that the genomes of these species share highly conserved gene content and gene order. Using an alignment-based approach, we show that F. iinumae and F. vesca are the diploid progenitors to the octoploid F. x ananassa, whereas the other three diploids that we analyzed in this study are not parental species. We generated a fully resolved, dated phylogeny of Fragaria, and determined that the genus arose similar to 6.37 Ma. Our results effectively resolve conflicting hypotheses regarding the putative diploid progenitors of the cultivated strawberry, establish a reliable backbone phylogeny for the genus, and provide genetic resources for molecular breeding.

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