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Genomic prediction in breeding populations containing hundreds to
thousands of parents and seedlings is prohibitively expensive with current
high-density ge- netic marker platforms designed for strawberry. We
developed mid-density pan- els of molecular inversion probes (MIPs) to be
deployed with the ‘DArTag’ marker platform to provide a low-cost,
high-throughput genotyping solution for straw- berry genomic prediction.
In total, 7,742 target SNP regions were used to gener- ate MIP assays that
were tested with a screening panel of 376 octoploid Fragaria accessions.
We evaluated the performance of DArTag assays based on geno- type
segregation, amplicon coverage, and their ability to produce subgenome-
specific amplicon alignments to the FaRR1 assembly and subsequent
alignment- based variant calls with strong concordance to DArT’s
alignment-free, count- based genotype reports. We used a combination of
marker performance metrics and physical distribution in the FaRR1 assembly
to select 3K and 5K production panels for genotyping of large strawberry
populations. We show that the 3K and 5K DArTag panels are able to target
and amplify homologous alleles within subgenomic sequences with low
amplification bias between reference and alter- nate alleles, supporting
accurate genotype calling while producing marker geno- types that can be
treated as functionally diploid for quantitative genetic analy- sis. The
3K and 5K target SNPs show high levels of polymorphism in diverse F. ×
ananassa germplasm and UC Davis cultivars, with mean pairwise diversity
(π) estimates of 0.40 and 0.32, and mean heterozygous genotype frequencies
of 0.35 and 0.33, respectively.
31 views reported since publication in 2023.