Abstract
Citrus unshiu Marc. cv. Miyagawa-wase is the most widely cultivated citrus variety in Korea. To determine whether the C. unshiu genome used in this study shows genetic variation compared to the published reference genome (C. unshiu Marc. Miyagawa-wase), we conducted genome re-sequencing of two C. unshiu cultivars (Miyagawa-1 and Miyagawa-2) cultivated on Jeju in Korea. Compared with the reference genome, 1,198,650 and 1,207,084 single-nucleotide polymorphisms (SNPs) and 172,259 and 172,391 insertion/deletion polymorphisms (InDels) were detected in the Miyagawa-1 and -2 genomes, respectively. In SNP and InDel classifications by genome annotation, 367,591 and 369,068 SNPs and 45,362 and 45,464 InDels were located in the genic regions of Miyagawa-1 and -2, respectively. Among the SNPs of Miyagawa-1 and -2, transitions were more frequent than transversions. The majority of InDels was distributed in 1-bp InDels in both cultivars. The comparative number of total SNPs between Miyagawa-1 and -2 was smaller than the number of SNPs between the reference genome and Miyagawa-1 or -2. Gene ontology (GO) analysis showed that 23,164 and 23,049 genes with SNPs and 16,830 and 16,774 genes with InDels were annotated in the GO database. Taken together, Miyagawa-1 and -2 show genome-wide variation, including SNPs and InDels, compared to the published C. unshiu Marc. cv. Miyagawa-wase genome. This study suggests it would be more accurate to use the Miyagawa-1 and -2 genome sequences as a reference when conducting research using C. unshiu cultivated in Korea.
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This research was supported by the 2021 Scientific Promotion Program funded by Jeju National University. The Subtropical Horticulture Research Institute and Research Institute for Subtropical Agriculture and Biotechnology provided facilities and equipment to conduct this research.
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Eun, CH., Kim, IJ. Genome-wide DNA polymorphisms of Citrus unshiu Marc. cv. Miyagawa-wase cultivated in different regions based on whole-genome re-sequencing. Plant Biotechnol Rep 15, 551–559 (2021). https://doi.org/10.1007/s11816-021-00696-z
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DOI: https://doi.org/10.1007/s11816-021-00696-z