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Quantitative resistance to late blight from Solanum berthaultii cosegregates with R Pi-ber : insights in stability through isolates and environment

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Abstract

Genetic resistance is a valuable tool in the fight against late blight of potatoes but little is known about the stability and specificity of quantitative resistance including the effect of defeated major resistance genes. In the present study we investigated the effect of different isolates of Phytophthora infestans on the mode of action of R Pi-ber , an R-gene originating from Solanum berthaultii. The experiments were conducted on progenies derived from two reciprocal inter-specific backcrosses of Solanum tuberosum and S. berthaultii. The plant–pathogen interaction was tested in diverse environments including field, greenhouse and growth chamber conditions. The R Pi-ber gene provided complete resistance against a US8 isolate of P. infestans in all trials. When isolates compatible with R Pi-ber were used for inoculation, a smaller, but significant resistance effect was consistently detected in the same map position as the R-gene. This indicates that this R-gene provides a residual resistance effect, and/or that additional resistance loci are located in this genomic region of chromosome X. Additional quantitative resistance loci (QRL) were identified in the analyzed progenies. While some of the QRL (such as those near TG130 on chromosome III) were effective against several isolates of the pathogen, others were isolate specific. With a single exception, the S. berthaultii alleles were associated with a decrease in disease severity. Resistance loci reported in the present study co-locate with previously reported R-genes and QRL to P. infestans and other pathogens.

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Acknowledgments

This study was supported by Syngenta. We want to thank John Cianchietti, Kevin Myers, Barbara Esposito, Phoi Tran, and Karen Moravec for their help on the field experiments. Clare Nelson provided valuable insight on data analyses. We also wish to thank Jason Rauscher for critical reading and suggestions on the manuscript. Thanks also to Hector Lozoya-Saldaña and PICTIPAPA for supporting field research in Mexico.

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  1. Andrew Greenland

    Present address: NIAB, Cambridge, UK

Authors and Affiliations

  1. Department of Plant Pathology and Plant-Microbe Biology, Cornell University, Ithaca, NY, USA

    Gilda Rauscher, Hilary Mayton, Christine D. Smart & William E. Fry

  2. Department of Plant Pathology and Plant-Microbe Biology, Cornell University, Geneva, NY, USA

    Christine D. Smart

  3. Department of Horticulture, Cornell University, Ithaca, NY, USA

    Ivan Simko

  4. Centro Internacional de la Papa, Lima, Peru

    Merideth Bonierbale

  5. Crop Improvement and Protection Research Unit, USDA-ARS, Salinas, CA, USA

    Gilda Rauscher & Ivan Simko

  6. Horticultural Crops Research Unit, USDA-ARS, Corvallis, OR, USA

    Niklaus J. Grünwald

  7. Syngenta, Jealott’s Hill, Bracknell, UK

    Andrew Greenland

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  1. Gilda Rauscher
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Correspondence to William E. Fry.

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Rauscher, G., Simko, I., Mayton, H. et al. Quantitative resistance to late blight from Solanum berthaultii cosegregates with R Pi-ber : insights in stability through isolates and environment. Theor Appl Genet 121, 1553–1567 (2010). https://doi.org/10.1007/s00122-010-1410-x

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