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Development of a simple PCR marker tagging the Allium roylei fragment harboring resistance to downy mildew (Peronospora destructor) in onion (Allium cepa L.)

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Abstract

For the efficient introgression of the downy mildew resistance gene from a resistant cultivar into domestic breeding lines, molecular markers used for marker-assisted backcrossing (MAB) were developed in onion (Allium cepa L.). The resistance gene was originally introgressed from the wild species Allium roylei using interspecific hybridization, and the resistant gene was known to be positioned at the end of chromosome 3. Therefore, the cDNA sequences of the loci located at the ends of chromosome 3 of two linkage maps were obtained from a transcriptome database. Primer pairs were designed on the exon sequences of eight loci; among them, the PCR products of the i25255 locus showed length polymorphism between the A. roylei and onions, and both large- and small-sized PCR products were observed in the resistant cultivar. A sequence analysis showed that a 67-bp indel existed in the intron sequences. Based on this indel polymorphism, a simple PCR marker, designated “DMR1”, was developed. An analysis of diverse onion accessions showed that, with the exception of the resistant cultivar, none of the accessions contained the A. roylei-specific marker genotype. These results indicate that the DMR1 marker was successfully tagging the A. roylei fragment harboring the downy mildew resistance gene. After further analysis of multiple loci positioned at chromosome 3, a range of the A. roylei fragment introgressed in the resistant cultivar was determined in two linkage maps. On the basis of the range of the A. roylei fragment, three molecular markers used for recombinant selection in MAB were also developed.

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Acknowledgments

This research was supported by the Agriculture Research Center program, Golden Seed Project (Center for Horticultural Seed Development, No 213008-04-3-SB910) and a grant from the Next-Generation BioGreen 21 Program (Plant Molecular Breeding Center No. PJ011034). The authors thank Ji-wha Hur, Jeong-Ahn Yoo, and Su-jung Kim for their dedicated technical assistance.

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Correspondence to Sunggil Kim.

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Supplementary Fig. 1

Alignment of sequences of A. roylei and H6 alleles. a i33232 locus. b i35214 locus. The polymorphic sequences recognized by the restriction enzyme (Msp I) which were used in CAPS marker genotyping are enclosed in the rectangular boxes. The horizontal arrows indicate the positions of the primers. Supplementary material 1 (TIFF 226 kb)

Supplementary Fig. 2

Alignment of sequences of ‘Santero’ and H6 alleles of the i30363 locus. The polymorphic sequences recognized by the restriction enzyme (Aci I) which were used in CAPS marker genotyping are enclosed in the rectangular boxes. The horizontal arrows indicate the positions of the primers. Supplementary material 2 (TIFF 122 kb)

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Kim, S., Kim, CW., Choi, MS. et al. Development of a simple PCR marker tagging the Allium roylei fragment harboring resistance to downy mildew (Peronospora destructor) in onion (Allium cepa L.). Euphytica 208, 561–569 (2016). https://doi.org/10.1007/s10681-015-1601-2

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