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Tuber Resistance and Slow-Rotting Characteristics of Potato Clones Associated with the Solanaceae Coordinated Agricultural Project to the US-24 Clonal Lineage of Phytophthora infestans

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Abstract

Late blight, caused by Phytophthora infestans, is a devastating disease on potato worldwide and new lineages of the pathogen continue to develop in the U.S. Breeding for resistance is important for economic and environmental purposes. The Solanaceae Coordinated Agricultural Project (SolCAP) focuses on linking allelic variation in genes to valuable traits in elite cultivated potato germplasm. This research assessed the SolCAP diversity panel (206 clones in Washington and 213 clones in Wisconsin) for tuber resistance to the US-24 clonal lineage of P. infestans after potatoes were harvested from fields in Washington and Wisconsin in 2011. This is the first time this germplasm has been evaluated for tuber resistance to P. infestans using a non-intrusive zoospore inoculation technique. Clones with a percent incidence of 30% or less were considered resistant and only eight clones (Palisade Russet, AWN86514–2, MSL268-D, MSM171-A, MSM182–1, MSN230-1RY, Patagonia and Yukon Gem) were characterized as resistant at both locations. These clones have previously demonstrated high to moderate partial foliar resistance to isolates of P.infestans and therefore represent germplasm with both foliar and tuber resistance. Nine clones (AWN86514–2, F66041, MN 18747, MSM 182–1, MSN230-1RY, Modoc, Ama-Rosa, Patagonia and Purple Majesty), were characterized as slow-rotting at both locations with a mean percent internal rot of 75% or less after 33 days of storage. Two clones, MN 18747 and Modoc, are considered to have the highest risk of being a carrier for P. infestans of all the clones evaluated in the SolCAP collection. Not a single clone demonstrated complete tuber resistance to the US-24 strain at both locations.

Resumen

El tizón tardío, causado por Phytophthora infestans, es una enfermedad devastadora de la papa en el mundo, y se continúan desarrollando nuevos linajes del patógeno en los E.U.A. El mejoramiento para resistencia es importante para propósitos económicos y ambientales. El Proyecto Agrícola Coordinado de Solanaceae (SolCAP en inglés), se enfoca en ligar variación alélica en genes para caracteres valiosos en germoplasma élite de papa cultivada. Esta investigación evaluó el panel de diversidad de SolCAP (206 clones en Washington y 213 clones en Wisconsin) para resistencia de tubérculo a la línea clonal US-24 de P. infestans después de que se cosecharon las papas del campo en Washington y Wisconsin en 2011. Esta es la primera vez que este germoplasma ha sido evaluado para resistencia del tubérculo a P. infestans usando una técnica no invasiva de inoculación con zoosporas. Los clones con un porcentaje de incidencia de 30% o menos se consideraron resistentes y solo ocho clones (Palisade Russet, AWN86514–2, MSL268-D, MSM171-A, MSM182–1, MSN230-1RY, Patagonia y Yukon Gem) se caracterizaron como resistentes en ambas localidades. Estos clones han demostrado previamente resistencia foliar parcial alta o moderada a aislamientos de P. infestans, por lo que representan germoplasma con resistencia tanto foliar como de tubérculo. Nueve clones (AWN86514–2, F66041, MN 18747, MSM 182–1, MSN230-1RY, Modoc, Ama-Rosa, Patagonia y Purple Majesty), se caracterizaron como de lenta pudrición en ambas localidades, con una media de pudrición interna de 75% o menos después de 33 días de almacenamiento. Dos clones, MN 18747 y Modoc, se considera que tienen el riesgo más alto de ser vectores de P. infestans de todos los clones evaluados en la colección SolCAP. Ni un solo clon mostró resistencia completa de tubérculo a la variante US-24 en ambas localidades.

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Acknowledgements

This study was partially funded by the Agriculture and Food Research Initiative Applied Plant Genomics CAP Program of the USDA’s National Institute of Food and Agriculture under the grant titled, “The Solanaceae Coordinated Agricultural Project (SolCAP)”. A special thank you to Virginia A. Coffman and Tyler McClure who helped with many technical aspects of this research. Experiments associated with this research comply with the current laws of the United States of America where they were performed.

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Authors and Affiliations

  1. USDA-ARS, Grain Legume Genetics and Physiology Research Unit, 24106 N. Bunn Rd, Prosser, WA, 99350, USA

    Lyndon D. Porter

  2. USDA-ARS, Temperate Tree Fruit and Vegetable Research Unit, 24106 N. Bunn Rd, Prosser, WA, 99350, USA

    Charles R. Brown

  3. USDA-ARS, Vegetable Crops Research Unit, 1575 Linden Dr, Madison, WI, 53706, USA

    Shelley H. Jansky

  4. Department of Plant Pathology, Washington State University, PO Box 646430, Pullman, WA, 99164, USA

    Dennis A. Johnson

  5. Central Oregon Agricultural Research Center, Department of Botany and Plant Pathology, Oregon State University, 850 NW Dogwood Lane, Madras, OR, 97741, USA

    Jeremiah K. S. Dung

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Porter, L.D., Brown, C.R., Jansky, S.H. et al. Tuber Resistance and Slow-Rotting Characteristics of Potato Clones Associated with the Solanaceae Coordinated Agricultural Project to the US-24 Clonal Lineage of Phytophthora infestans . Am. J. Potato Res. 94, 160–172 (2017). https://doi.org/10.1007/s12230-016-9559-8

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