Identification and rapid mapping of a gene conferring broad-spectrum late blight resistance in the diploid potato species Solanum verrucosum through DNA capture technologies

Xinwei Chen, Dominika Lewandowska, Miles R. Armstrong, Katie Baker, Tze Yin Lim, Micha Bayer, Brian Harrower, Karen McLean, Florian Jupe, Kamil Witek, Alison K. Lees, Jonathan D. Jones, Glenn J. Bryan, Ingo Hein*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)
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    Abstract

    Key message: A broad-spectrum late blight disease-resistance gene from Solanum verrucosum has been mapped to potato chromosome 9. The gene is distinct from previously identified-resistance genes. Abstract: We have identified and characterised a broad-spectrum resistance to Phytophthora infestans from the wild Mexican species Solanum verrucosum. Diagnostic resistance gene enrichment (dRenSeq) revealed that the resistance is not conferred by previously identified nucleotide-binding, leucine-rich repeat genes. Utilising the sequenced potato genome as a reference, two complementary enrichment strategies that target resistance genes (RenSeq) and single/low-copy number genes (Generic-mapping enrichment Sequencing; GenSeq), respectively, were deployed for the rapid, SNP-based mapping of the resistance through bulked-segregant analysis. Both approaches independently positioned the resistance, referred to as Rpi-ver1, to the distal end of potato chromosome 9. Stringent post-enrichment read filtering identified a total of 64 informative SNPs that corresponded to the expected ratio for significant polymorphisms in the parents as well as the bulks. Of these, 61 SNPs are located on potato chromosome 9 and reside within 27 individual genes, which in the sequenced potato clone DM locate to positions 45.9 to 60.9 Mb. RenSeq- and GenSeq-derived SNPs within the target region were converted into allele-specific PCR-based KASP markers and further defined the position of the resistance to a 4.3 Mb interval at the bottom end of chromosome 9 between positions 52.62–56.98 Mb.

    Original languageEnglish
    Pages (from-to)1287-1297
    Number of pages11
    JournalTheoretical and Applied Genetics
    Volume131
    Issue number6
    Early online date20 Mar 2018
    DOIs
    Publication statusPrint publication - 1 Jun 2018

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