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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• 作者：Seongjun Kim ; Cheol-Woo Kim ; Min-Seon Choi ; Sunggil Kim
• 关键词：Onion (Allium cepa L.) ; Downy mildew resistance ; RNA ; Seq ; Molecular markers ; Marker ; assisted backcrossing
• 刊名：Euphytica
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：208
• 期：3
• 页码：561-569
• 全文大小：931 KB
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• 作者单位：Seongjun Kim (1)
  Cheol-Woo Kim (2)
  Min-Seon Choi (2)
  Sunggil Kim (1)
  
  1. Department of Plant Biotechnology, Biotechnology Research Institute, Chonnam National University, Gwangju, 500-757, Korea
  2. National Institute of Horticultural & Herbal Science, RDA, Muan, 534-833, Korea
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  Plant Sciences
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5060

文摘

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.