American Journal of Potato Research

, Volume 87, Issue 6, pp 497–501 | Cite as

Genetic Stability in Potato Germplasm for Resistance to Root Galling Caused by the Pathogen Spongospora subterranea

  • Nadav Nitzan
  • Kathleen G. Haynes
  • Jeff S. Miller
  • Dennis A. Johnson
  • Tom F. Cummings
  • Dallas L. Batchelor
  • Chris Olsen
  • Charles R. Brown
Article

Abstract

Spongospora subteranea, the causal agent of potato powdery scab is becoming increasingly important worldwide. Little is known about the genetic basis of resistance to this disease. The present study tested the hypothesis that potato genotypes with stable genetic resistance to “Spongospora root galling” were present in potato germplasm. Root galling index values of 24 genotypes screened for resistance in four field trials (environments) in 2004 and 2005 in Washington State and Idaho were analyzed. Genotypes tested included five resistant, four industry standards and advanced selections from the USDA-ARS, Prosser, WA program. Broad-sense heritability was calculated as 0.76 with a 95% confidence interval of 0.55–0.89, indicating a fairly high genetic component of the trait. Of the 24 genotypes that were tested, eight showed no genotype*environment interactions while six of the remainder had significant variance (i.e., they were unstable) after removal of genotype*environment variance. Among the five resistant genotypes, PA95B2-4 was stable, and PA98N5-2, PA98NM38-1, PO94A009-7 and POR00HG5-1 were stable after the removal of environmental heterogeneity. Among the four industry standards, Shepody was unstable, whereas Ranger Russet, Russet Burbank and Umatilla Russet were stable after the removal of genotype*environment variance. Stable resistance to “Spongospora root galling” was identified. A large portion of the variation was genetic, which will enable breeders to use resistant and stable potato genotypes as parents in future breeding to develop superior commercial potato cultivars with resistance to “Spongospora root galling”.

Keywords

Powdery scab Solanum tuberosum L. Resistance Broad-sense heritability 

Resumen

Spongospora subteranea, el agente causal de la roña polvorienta se está convirtiendo de importancia en aumento en el mundo. Se sabe poco de las bases genéticas de la resistencia a esta enfermedad. El presente estudio probó la hipótesis de que los genotipos de papa con resistencia genética estable al “agallamiento radical por Spongospora” estaban presentes en germoplasma de papa. Se analizaron los valores del índice de agallamiento radical de 24 genotipos probados para resistencia en cuatro ensayos de campo (ambientes) en 2004 y 2005 en los Estados de Washington y Idaho. Los genotipos probados incluyeron cinco resistentes, cuatro estándares para la industria y selecciones avanzadas del programa USDA-ARS, Prosser, WA. Se calculó la heredabilidad en una base amplia como 0.76 con un intervalo de confianza de 95% de 0.55 a 0.89, indicando justamente un componente genético amplio del carácter. De los 24 genotipos probados, ocho no mostraron interacción genotipo-medio ambiente, mientras que seis del resto tuvieron varianza significativa (por ejemplo, fueron inestables) después de eliminar la varianza genotipo ambiente. Entre los cinco genotipos resistentes, PA95B2-4 fue estable, y PA98N5-2, PA98NM38-1, PO94A009-7 y POR00HG5-1 fueron estables después de eliminar la heterogeneidad del ambiente. Entre los cuatro genotipos estándares para la industria, Shepody fue inestable, mientras que Ranger Russet, Russet Burbank y Umatilla Russet fueron estables después de eliminar la varianza genotipo-ambiente. Se identificó resistencia estable a “agallamiento radical por Spongospora”. Una gran proporción de la variación fue genética, lo cual permitirá a los mejoradores usar genotipos resistentes y estables de papa como progenitores en mejoramiento futuro para desarrollar cultivares comerciales de papa superiores con resistencia al “agallamiento radical por Spongospora”.

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Copyright information

© Potato Association of America 2010

Authors and Affiliations

  • Nadav Nitzan
    • 1
  • Kathleen G. Haynes
    • 2
  • Jeff S. Miller
    • 3
  • Dennis A. Johnson
    • 4
  • Tom F. Cummings
    • 4
  • Dallas L. Batchelor
    • 5
  • Chris Olsen
    • 6
  • Charles R. Brown
    • 1
  1. 1.USDA-ARSProsserUSA
  2. 2.USDA-ARSBeltsvilleUSA
  3. 3.Miller Research, LCC.RupertUSA
  4. 4.Washington State UniversityPullmanUSA
  5. 5.Lamb-WestonPascoUSA
  6. 6.L.J. Olsen, Inc.OthelloUSA

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