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Partial Resistance to Potato Black Dot, Caused by Colletotrichum coccodes in Solanum tuberosum Group Andigena

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Abstract

Black dot is caused by the fungus Colletotrichum coccodes (Wallr.) S.J. Hughes. The disease is prevalent in potato fields and can be of economic concern by itself, or as a part of the potato early dying syndrome. Little is known about resistance to this disease. In the present study resistance to potato black dot was tested in Solanum tuberosum Group Andigena. Forty accessions were chosen randomly from the core collection and screened. The accessions originated from Peru, Mexico, Bolivia, Columbia, Ecuador, Argentina and Costa Rica. Five accessions had less (P ≤ 0.05) disease on roots and stems than a set of commercial standards. These accessions were: PIs 189473, 230475, 161683, 243367 and 230470. They were retested to validate their partial resistance. Fifteen plants, each a unique genotype, were selected from each accession and were propagated into multiple clones that were inoculated with the pathogen. Three genotypes were identified with less (P < 0.05) disease on roots and stems than the industry standard. These genotypes originated from the accessions PI-243367 and PI-230475. Clones of the resistant genotypes were added to the potato germplasm collection located at the Potato Improvement Laboratory of the USDA-ARS near Prosser, WA, to be used in the development of black dot resistant commercial varieties.

Resumen

La mancha negra es producida por el hongo Colletotrichum coccodes (Wallr.) S.J. Hughes. La enfermedad es prevalente en los campos de papa y puede ser de importancia económica de por sí, o es parte del síndrome de muerte temprana de la papa. Se sabe poco respecto de la resistencia a esta enfermedad. En el presente estudio se probó la resistencia a la mancha negra de la papa en Solanum tuberosum grupo Andígena. Se seleccionaron y evaluaron cuarenta accesiones al azar de la colección principal. Las accesiones fueron originarias de Perú, México, Bolivia, Colombia, Ecuador, Argentina y Costa Rica. Cinco accesiones tuvieron menos enfermedad (P ≤ 0.05) en raíces y tallos que un juego de estándares comerciales. Estas accesiones fueron: PIs 189473, 230475, 161683, 243367 y 230470. Se volvieron a probar para validar su resistencia parcial. Quince plantas, cada una de un genotipo único, se seleccionaron de cada accesión y se propagaron en múltiples clones que se inocularon con el patógeno. Se identificaron tres genotipos con menos enfermedad (P ≤ 0.05) en raíces y tallos que los estándares de la industria. Estos genotipos se originaron de las accesiones Pl-243367 y Pl230475. Los clones de los genotipos resistentes se agregaron a la colección de germoplasma de papa ubicada en el Laboratorio de Mejoramiento de Papa del USDA-ARS cerca de Prosser, WA, para usarse en el desarrollo de variedades comerciales resistentes a la mancha negra.

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Acknowledgments

The authors thank Mr. Tom F. Cummings from the Dept. of Plant Pathology at Washington State University for his assistance with the statistical analysis. The authors also wish to extend their sincere gratefulness to Miss Catherine Burton and Miss Amanda Yager from the Washington State University, Irrigated Agricultural Research and Extension Center near Prosser WA, for their support during the course of this study.

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Authors and Affiliations

  1. Vegetable and Forage Crops and Research Unit, USDA/ARS, Prosser, WA, 99350, USA

    Nadav Nitzan, Richard A. Quick, Will D. Hutson & Chuck R. Brown

  2. Potato Germplasm Collection, USDA/ARS, Sturgeon Bay, WI, USA

    John Bamberg

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  1. Nadav Nitzan
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  2. Richard A. Quick
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  3. Will D. Hutson
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  4. John Bamberg
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  5. Chuck R. Brown
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Correspondence to Chuck R. Brown.

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Nitzan, N., Quick, R.A., Hutson, W.D. et al. Partial Resistance to Potato Black Dot, Caused by Colletotrichum coccodes in Solanum tuberosum Group Andigena . Am. J. Pot Res 87, 502–508 (2010). https://doi.org/10.1007/s12230-010-9155-2

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  • DOI: https://doi.org/10.1007/s12230-010-9155-2

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