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Resistance to Meloidogyne chitwoodi Identified in Wild Potato Species


Meloidogyne chitwoodi (Columbia root-knot nematode, CRKN) can cause serious damage in potato production systems, decreasing tuber value in the fresh market and processing industries. Genetic resistance to CRKN was first identified from the wild diploid potato species Solanum bulbocastanum accession SB22 and was successfully introgressed into tetraploid potato breeding material. To expand the base of genetic resistance, 40 plant accessions representing nine wild potato species were screened for their resistance to M. chitwoodi. Greenhouse screening identified fifteen clones from S. hougasii, one clone from S. bulbocastanum, and one clone from S. stenophyllidium with moderate to high levels of resistance against three isolates of M. chitwoodi. Geographical mapping showed that the resistance sources identified in this and previous studies primarily originated in the states of Jalisco and Michoacán in west-central Mexico. These new sources of resistance will be introgressed into elite potato populations to facilitate the development of potato cultivars with durable resistance to M. chitwoodi.


Meloidogyne chitwoodi (nematodo agallador de Columbia, CRKN por sus siglas en inglés), puede causar daño serio en los sistemas de producción de papa, disminuyendo el valor del tubérculo en el mercado fresco y en las industrias del procesamiento. La resistencia genética al CRKN se identificó primero en la especie silvestre diploide de papa Solanum bulbocastanum, accesión SB22, y fue introducida con éxito en material tetraploide de mejoramiento de papa. Con el fin de expandir la base de resistencia genética, se probaron 40 plantas de las accesiones, representando nueve especies silvestres de papa, para su resistencia a M. chitwoodi. En las pruebas de invernadero se identificaron 15 clones de S. hougasii, uno de S. bulbocastanum, y uno de S. stenophyllidium, con niveles de moderados a altos de resistencia contra tres aislamientos de M. chitwoodi. El mapa geográfico mostró que las fuentes de resistencia identificadas en este y en estudios previos, se originaron primeramente en los Estados de Jalisco y Michoacán, en el centro-occidente de México. Estas nuevas fuentes serán introducidas a poblaciones élite de papa para permitir el desarrollo de variedades de papa con resistencia durable a M. chitwoodi.

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Correspondence to Vidyasagar Sathuvalli.

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Graebner, R.C., Brown, C.R., Ingham, R.E. et al. Resistance to Meloidogyne chitwoodi Identified in Wild Potato Species. Am. J. Potato Res. 95, 679–686 (2018).

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  • Crop wild relatives
  • germplasm screening
  • root-knot nematode
  • Solanum
  • hougasii
  • bulbocastanum
  • stenophyllidium