Origin and evolution of the octoploid strawberry genome

Nature Genetics
Patrick P EdgerSteven J Knapp

Abstract

Cultivated strawberry emerged from the hybridization of two wild octoploid species, both descendants from the merger of four diploid progenitor species into a single nucleus more than 1 million years ago. Here we report a near-complete chromosome-scale assembly for cultivated octoploid strawberry (Fragaria × ananassa) and uncovered the origin and evolutionary processes that shaped this complex allopolyploid. We identified the extant relatives of each diploid progenitor species and provide support for the North American origin of octoploid strawberry. We examined the dynamics among the four subgenomes in octoploid strawberry and uncovered the presence of a single dominant subgenome with significantly greater gene content, gene expression abundance, and biased exchanges between homoeologous chromosomes, as compared with the other subgenomes. Pathway analysis showed that certain metabolomic and disease-resistance traits are largely controlled by the dominant subgenome. These findings and the reference genome should serve as a powerful platform for future evolutionary studies and enable molecular breeding in strawberry.

Associated Datasets

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Citations

Aug 20, 2019·G3 : Genes - Genomes - Genetics·Christopher R BarbeyKevin M Folta
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Datasets Mentioned

BETA
PRJNA394190

Methods Mentioned

BETA
Hi-C
flow cytometry
flow
electrophoresis
Illumina sequencing
HiC
proximity-ligation
RNA-seq

Software Mentioned

ProtExcluder
Quota Align
TBLASTX
Mitofy
RepeatMasker
Phytozome
RefTrans
retriever
HiRise
annoBTD

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