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Revisiting the Origin of the Octoploid Strawberry

Aaron Liston, Na Wei, Jacob Tennessen, Junmin Li, Ming Dong, Tia-Lynn Ashman
doi: https://doi.org/10.1101/665216
Aaron Liston
1Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon, USA
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  • For correspondence: aaron.liston@oregonstate.edu
Na Wei
2Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
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Jacob Tennessen
3Department of Immunology and Infectious Diseases, Harvard T. H. Chan School of Public Health, Boston, Massachusetts, USA
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Junmin Li
4Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, Taizhou, China
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Ming Dong
5Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, College of Environmental Life Sciences, Hangzhou Normal University, Hangzhou, China
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Tia-Lynn Ashman
2Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
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Abstract

The cultivated strawberry, Fragaria ×ananassa, originated in France approximately 270 years ago via hybridization between two wild species introduced from North and South America. Both the cultivated strawberry and its parental species are octoploids with 2n=8x=56 chromosomes. In the recent publication of the genome of the cultivated strawberry, the authors present a novel phylogenetic hypothesis, proposing that each of the four subgenomes originated from a different 2n=2x=14 diploid progenitor. They further suggest that the hexaploid species Fragaria moschata was a direct ancestor of the strawberries. We reanalyzed the four octoploid subgenomes in a phylogenomic context, and found that only two extant diploids were progenitors, a result that is consistent with several previous studies. We also conducted a phylogenetic analysis of genetic linkage-mapped loci in the hexaploid F. moschata, and resolved its origin as independent of the octoploids. We identified assumptions in their tree-searching algorithm that prevented it from accepting extinct or unsampled progenitors, and we argue that this is a critical weakness of their approach. Correctly identifying their diploid progenitors is important for understanding and predicting the responses of polyploid plants to climate change and associated environmental stress.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted June 11, 2019.
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Revisiting the Origin of the Octoploid Strawberry
Aaron Liston, Na Wei, Jacob Tennessen, Junmin Li, Ming Dong, Tia-Lynn Ashman
bioRxiv 665216; doi: https://doi.org/10.1101/665216
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Revisiting the Origin of the Octoploid Strawberry
Aaron Liston, Na Wei, Jacob Tennessen, Junmin Li, Ming Dong, Tia-Lynn Ashman
bioRxiv 665216; doi: https://doi.org/10.1101/665216

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