Late blight caused by Phytophthora infestans greatly constrains potato production. Many Resistance (R) genes were cloned from wild Solanum species and/or introduced into potato cultivars by breeding. However, individual R genes have been overcome by P. infestans evolution; durable resistance remains elusive. We positionally cloned a new R gene, Rpi-amr1, from Solanum americanum, that encodes an NRC helper-dependent CC-NLR protein. Rpi-amr1 confers resistance in potato to all 19 P. infestans isolates tested. Using association genomics and long-read RenSeq, we defined eight additional Rpi-amr1 alleles from different S. americanum and related species. Despite only ~90% identity between Rpi-amr1 proteins, all confer late blight resistance but differentially recognize Avramr1 orthologues and paralogues. We propose that Rpi-amr1 gene family diversity assists detection of diverse paralogues and alleles of the recognized effector, facilitating durable resistance against P. infestans.
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Supporting raw reads were deposited in European Nucleotide Archive under project number PRJEB38240. BAC and Rpi-amr1 allele sequences were deposited in GenBank under accession numbers MW345286-95 and MW348763. Detailed accession information is shown in Supplementary Table 7. All the materials in this study are available upon request.
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This research was financed from BBSRC grant no. BB/P021646/1 and the Gatsby Charitable Foundation. This research was supported in part by the NBI Computing infrastructure for Science (CiS) group through the provision of a High-Performance Computing Cluster. We would like to thank TSL bioinformatics team, transformation team and horticultural team for their support. We thank Experimental Garden and Genebank of Radboud University (Nijmegen, the Netherlands), IPK Gatersleben (Germany) and S. Knapp (Natural History Museum, London, United Kingdom) for access to S. americanum, S. nigrescens and S. nigrum genetic diversity and G. Kessel, F. Govers and P. Birch for providing P. infestans isolates.
K.W., H.S.K., F.G.J. and J.D.G.J. are named inventors on a patent application (PCT/US2017/066691) pertaining to Rpi-amr1 that was filed by the 2Blades Foundation on behalf of the Sainsbury Laboratory. The other authors declare no competing interests.
Peer review information Nature Plants thanks Erik Andreasson, Marc Ghislain and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Supplementary Figs. 1–8 and Tables 1–4.
Table 5. Population genetics summary statistics calculated for Rpi-amr1 and Avramr1 homologues. Table 6. Evidence of sequence exchange between Rpi-amr1 orthologues and paralogues from SP2273 using 3SEQ. An exact non-parametric mosaicism statistic algorithm was implemented in 3SEQ; we found statistical evidence of recombination (the null hypothesis of clonal evolution was rejected). Table 7. Accession numbers of all sequencing data in this study.
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Witek, K., Lin, X., Karki, H.S. et al. A complex resistance locus in Solanum americanum recognizes a conserved Phytophthora effector. Nat. Plants 7, 198–208 (2021). https://doi.org/10.1038/s41477-021-00854-9