Genome structure variation analyses of peach reveal population dynamics and a 1.67 Mb causal inversion for fruit shape.

ABSTRACT:

Background

Structural variations (SVs), a major resource of genomic variation, can have profound consequences on phenotypic variation, yet the impacts of SVs remain largely unexplored in crops.

Results

Here, we generate a high-quality de novo genome assembly for a flat-fruit peach cultivar and produce a comprehensive SV map for peach, as a high proportion of genomic sequence is occupied by heterozygous SVs in the peach genome. We conduct population-level analyses that indicate SVs have undergone strong purifying selection during peach domestication, and find evidence of positive selection, with a significant preference for upstream and intronic regions during later peach improvement. We perform a SV-based GWAS that identifies a large 1.67-Mb heterozygous inversion that segre

SUBMITTER: Guan J 

PROVIDER: S-EPMC7784018 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature