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Male sterility is one of the reproductive isolation systems in plants and quite useful for F 1 seed production. We previously identified three independent quantitative trait loci (QTLs) for male sterility of cultivated strawberry, Here, we identified the specific subgenomes in which these QTLs are located by QTL-seq approach. QTLs qMS4.1 , qMS4.2 , and qMS4.3 were mapped separately in subgenomes Fvb4-4, Fvb4-3, and Fvb4-1, respectively, in 'Camarosa' genome assembly v. 1.0.a1. Candidate regions of qMS4.1 and qMS4.3 were clearly detected around 12-26 Mb in Fvb4-4 and 12-14 Mb in Fvb4-1, respectively; those of qMS4.2 were fragmented in Fvb4-3, which suggests that some scaffolds were incorrectly assembled in Fvb4-3. qMS4.3 was mapped to chr4X1 of 'Reikou' genome assembly r2.3, and qMS4.1 and qMS4.2 were both mapped to chr4Av, which indicates that differentiation of the subgenomes in which both QTLs are located was insufficient in 'Reikou' r2.3. Although 'Camarosa' genome assembly v. 1.0.a1 is an unphased map, which merges homologous chromosomes into one sequence, 'Reikou' genome assembly r2.3 is a phased map, which separates homologous chromosomes. QTL mapping to different reference genomes clearly showed the specific features of each reference genome, and that using different kinds of reference map could accelerate fine mapping and map-based cloning of certain genes of cultivated strawberry.

breeding science

Comparative QTL mapping for male sterility of cultivated strawberry (&lt;i&gt;Fragaria&lt;/i&gt; × &lt;i&gt;ananassa&lt;/i&gt; Duch.) using different reference genome sequences