Abstract
White bulb colors of onion (Allium cepa L.) are determined by the C and I loci which control the so-called recessive and dominant white bulb colors, respectively. To identify the causal gene responsible for the I locus, a combined approach of bulked segregant analysis and RNA-Seq was used in the present study. A total of 68 contigs containing homozygous single nucleotide polymorphisms (SNPs) between red and dominant white bulked RNAs were identified. The position of I locus was found to be located at chromosome 3 by performing comparative analysis of these contigs and using a previously constructed linkage map. After verification of homozygous SNPs by sequencing of PCR products, 12 high resolution melting, one cleaved amplified polymorphic sequence, and one InDel markers were developed. A linkage map flanking the I locus was constructed using these markers. Two tightly linked markers (DW51596 and DW35019) flanking the I locus were identified by analyzing 1457 F4 individuals. A total of 104 and 39 contigs showing more than tenfold increase of expression in red and dominant white bulks, respectively, were identified. Transcriptions of all structural genes encoding enzymes in flavonoid biosynthesis pathway were significantly reduced in the dominant white bulk. Transcription levels of most contigs showing more than tenfold reduced expression in dominant white were also significantly reduced in the recessive white bulbs controlled by the C locus. Genomic DNA sequences of 12 genes encoding transcription factors assumed to regulate flavonoid biosynthesis were analyzed. However, the causal gene for the I locus could not be identified.
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Acknowledgements
This research was supported by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through Agriculture, Food and Rural Affairs Convergence Technologies Program for Educating Creative Global Leader funded by the Ministry of Agriculture, Food and Rural Affairs (710011-03), Golden Seed Project (Center for Horticultural Seed Development, No. 213007-05-4-SBB10), and a grant from the Next-Generation BioGreen 21 Program (Plant Molecular Breeding Center No. PJ013400). The authors thank Ji-wha Hur, Jeong-Ahn Yoo, and Su-jung Kim for their dedicated technical assistance.
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Supplementary Fig.
1. Development of an HRM marker (DW12796) based on a single SNP between dominant white and red bulked DNAs. A. Alignment of nucleotide sequences flanking the SNP. Vertical arrow indicates the position of SNP. Horizontal arrows indicate primer-binding sites. B. Normalized melting peaks (upper) and curves (bottom) of the DW12796 marker. (TIFF 262 kb)
Supplementary Fig.
2. Flowchart showing the process determining linkage relationship of screened contigs relative to the position of I locus. Recombinants (R1 and R2) and Markers (M1, M2, M3, and M4) are examples used to describe the principle. (TIFF 178 kb)
Supplementary Fig.
3. Correlation for expression levels of all contigs between dominant white and red bulked RNAs. A. Reference transcriptome. B. De novo-assembled contigs. (TIFF 69 kb)
Supplementary Fig.
4. Comparison of expression levels of structural genes involved in flavonoid biosynthesis pathway between dominant white and red bulked RNAs. Detailed information of structural genes is shown in Baek et al. (2017). A. Reference transcriptome, B. De novo-assembled contigs. (TIFF 126 kb)
Supplementary Fig.
5. Genotyping of five types of onion bulb colors using molecular markers. Two CAPS markers, DW51596 and ANS-PS, were used to genotype the I locus and the L locus, respectively. DW: dominant white; YW: heterozygous white; RW: reddish white; R: red; Y: yellow; A: homozygous dominant control; H: heterozygous control; B: homozygous recessive control. (TIFF 154 kb)
Supplementary Fig.
6. Comparison of expression levels of onion bHLH-coding genes between dominant white and red bulked RNAs. Detail information of bHLH-coding genes is described in Baek et al. (2017). A. Reference transcriptome, B. De novo-assembled contigs. (TIFF 70 kb)
Supplementary Fig.
7. Comparison of expression levels of onion WD40-coding genes between dominant white and red bulked RNAs. Detail information of onion WD40-coding genes is described in Baek et al. (2017). A. Reference transcriptome, B. De novo-assembled contigs. (TIFF 91 kb)
Supplementary Fig.
8. Comparison of expression levels of onion MYB-coding genes between dominant white and red bulked RNAs. Detail information of onion MYB-coding genes is described in Baek et al. (2017). A. Reference transcriptome, B. De novo-assembled contigs. (TIFF 132 kb)
Supplementary Fig.
9. Comparison of bulb colors of reddish white and dominant white bulbs of the F3 segregating population (WR15). A. Reddish white onion bulbs, B. Dominant white onion bulbs. (TIFF 943 kb)
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Seo, I., Kim, JG., Moon, JH. et al. Construction of a linkage map flanking the I locus controlling dominant white bulb color and analysis of differentially expressed genes between dominant white and red bulbs in onion (Allium cepa L.). Euphytica 216, 97 (2020). https://doi.org/10.1007/s10681-020-02638-2
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DOI: https://doi.org/10.1007/s10681-020-02638-2