Rapid and practical molecular marker development for rind traits in watermelon
Tóm tắt
A three-locus model for rind phenotypes in watermelon (Citrullus lanatus) was previously proposed based on genetic analysis. These three loci, S (foreground stripe pattern), D (depth of rind color), and Dgo (background rind color), segregate in a Mendelian manner. Whole genome sequencing of watermelon offers a new strategy for marker development in these rind phenotype-related loci. A genotype analysis using subsets of 188, 273, 287 and 113 probes was performed for the ‘0901’, ‘10909’, ‘109905’ and ‘90509’ rind trait-segregating F2 populations, respectively. A total of 26, 34, 30 and 15 linkage groups with 175, 254, 269 and 79 probes were constructed for the ‘0901’, ‘10909’, ‘109905’ and ‘90509’ populations, respectively. The genetic order of the probes was mostly collinear with the physical order on the reference genome, except for some probes on chromosomes 1, 3 and 11. The three rind-related loci, S, D, and Dgo were anchored near chr6_25767 on chromosome 6, chr8_26061 on chromosome 8 and chr4_150/chr4_249 on chromosome 4, respectively. The three loci are located on different chromosomes, and the three-locus model was therefore verified through molecular genetic analysis. We suggest a rapid and practical marker development strategy that can be used not only for rind traits but also for other agriculturally important traits in watermelon and applied for conventional breeding.
Tài liệu tham khảo
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