3.1 Whole-genome resequencing, mapping, and SNP detection
The genome size was 836,201,995 bp, and individual genomes were sequenced to an average of 7× coverage, with the average coverage of 90% (Supporting information Table S1, S2). A total of 31,759,600 SNP markers were initially obtained from Shunchang, whereas 29,918,163 SNPs were obtained from Xiapu. After stringent filtering, 4,152,751 SNPs were identified from Shunchang and 3,298,993 from Xiapu. The filtered SNPs were used for subsequent analysis.