American Journal of Potato Research

, Volume 96, Issue 6, pp 552–563 | Cite as

QTL for Resistance to Globodera rostochiensis Pathotype Ro2 and G. pallida Pathotype Pa2/3 in Autotetraploid Potato

  • Jaebum Park
  • Christine A. Hackett
  • Louise-Marie Dandurand
  • Xiaohong WangEmail author
  • Walter S. De JongEmail author


The golden and white potato cyst nematodes (Globodera rostochiensis and G. pallida, respectively) are devastating quarantine pests of potatoes. The most widely distributed pathotype of the golden nematode, Ro1, is well controlled by the H1 resistance gene. A pathotype that overcomes H1, Ro2, has been detected on several farms in New York State. To map Ro2 resistance gene(s), two autotetraploid parental clones – NY121 (Ro2 resistant) and NY115 (susceptible) – along with 182 F1 offspring were genotyped with 8303 SNP markers, and the resistance of each clone to Ro2 was assessed with a greenhouse pot assay. Analysis with TetraploidSNPMap identified two Ro2 resistance QTL on chromosome 5: one QTL was located at 26 cM and explained 24.4% of the variation for resistance, while the second at 59 cM co-localized with a marker (57R) known to be tightly linked to H1 and explained 23.8% of the residual variation. Subsequent inoculation with G. pallida revealed that the chromosome 5 locus at 26 cM also conferred some resistance against pathotype Pa2/3, explaining 9.2% of the variation. A second QTL that increased susceptibility to Pa2/3 was located at 15 cM on chromosome 10 and explained 6.9% of the variation. The resistance gene(s) at 26 cM on chromosome 5 may correspond to previously described Grp1; a marker diagnostic for this region would be useful for applied potato breeding.


Potato cyst nematode Globodera rostochiensis pathotype Ro2 G. pallida Pa2/3 TetraploidSNPMap 


Los nematodos de quiste dorado y blanco (Globodera rostochiensis y G. pallida, respectivamente) son plagas cuarentenadas devastadoras de la papa. El patotipo mas ampliamente distribuido del nematodo dorado, Ro1, esta bien controlado por el gen de resistencia H1. Un patotipo que supera al H1, el Ro2, se detectó en varias siembras del Estado de Nueva York. Para mapear el gen(es) de resistencia de Ro2, se genotiparon dos clones parentales autotetraploides – NY121 (Ro2 resistente) y NY115 (susceptible) – al igual que la descendencia 182 F1, con marcadores SNP 8303, y se evaluó la resistencia de cada clon al Ro2 en un ensayo en invernadero. El análisis con el mapa SNP tetraploide identificó dos QTL de resistencia al Ro2 en el cromosoma 5: Se localizó un QTL a 28 cM y explicó 24.4% de la variación para la resistencia, mientras que el segundo, a 59 cM co47 localizado con un marcador (57R), se le conoce estar ligeramente ligado al H1, y explicó el 23.8% de la variación residual. Inoculación subsecuente con G pallida reveló que el locus del cromosoma 5 a 26 cM también confirió alguna resistencia contra el patotipo Pa2/3, explicando el 9.2% de la variación. Un segundo QTL que incrementó la susceptibilidad a Pa2/3 se localizó a 15 cM en el cromosoma 10 y explicó el 6.9% de la variación. El o los genes de resistencia a 26 cM en el cromosoma 5 pudieran corresponder a Grp 1 previamente descrito; un marcador de diagnóstico para esta región sería útil para el mejoramiento aplicado de la papa.



We thank Shuping Cheng and David Mark Thurston for excellent technical support and gratefully acknowledge funding provided by USDA National Institute of Food and Agriculture competitive grant 2015-69004-23634 and USDA-ARS specific cooperative agreement 58-8062-5-033.

Supplementary material

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© The Potato Association of America 2019

Authors and Affiliations

  1. 1.School of Integrative Plant ScienceCornell UniversityIthacaUSA
  2. 2.Biomathematics and Statistics ScotlandDundeeUK
  3. 3.Department of Entomology, Plant Pathology and NematologyUniversity of IdahoMoscowUSA
  4. 4.Robert W. Holley Center for Agriculture and Health, US Department of AgricultureAgricultural Research ServiceIthacaUSA

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