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Mapping Solanum berthaultii-based Late Blight (Phytophthora infestans) Resistance in a Diploid Population

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Abstract

Late blight, caused by the oomycete Phytophthora infestans (Mont) de Bary, is the most important disease of cultivated potato (Solanum tuberosum L.). An efficient long-term strategy for controlling late blight infection involves integration of host plant resistance to disease management programs. In this study, a diploid potato population segregating for late blight resistance was generated from an interspecific cross (MSX902) between S. tuberosum x S. chacoense hybrid (84SD22) and a late blight resistant Solanum berthaultii hybrid (Ber83). A total of 129 progeny and two parents were tested for foliar resistance against the US-23 P. infestans genotype using detached-leaf bioassays and inoculated field trials (2014 and 2015). Distribution of foliar late blight resistance and susceptibility was bimodal in both types of phenotype evaluation, suggesting a major R-gene may be associated with the resistance. A major QTL for late blight resistance on chromosome 10 was detected using both detached leaf bioassay and field trial data. The SNP marker solcap_snp_c1_15219 (26.5 cM) was at the peak of the QTL. Additionally, a minor QTL on chromosomes 5 was linked to SNPs solcap_snp_c1_3793. These SNP markers closely linked to the late blight resistance QTL can be used for marker-assisted breeding.

Resumen

El tizón tardío de la papa, causado por el oomiceto Phytophthora infestans (Mont) de Bary, es la enfermedad mas importante de la papa cultivada (Solanum tuberosum L.). Una estrategia eficiente a largo plazo para controlar la infección del tizón tardío involucra la integración de la resistencia de la planta hospedante a programas de manejo a de la enfermedad. En este estudio, se generó una población diploide de papa segregante para resistencia al tizón tardío de una cruza interespecífica (MSX902) entre S. tuberosum x un híbrido de S. chacoense (84SD22) y un híbrido resistente al tizón tardío de Solanum berthaultii (Ber83). Se probaron un total de 129 progenies y dos progenitores para resistencia foliar al genotipo US-23 de P. infestans usando el bioensayo de hoja desprendida y ensayos de campo inoculados (2014 y 2015). La distribución de la resistencia foliar al tizón tardío y la susceptibilidad fue bimodal en ambos tipos de evaluación fenotípica, lo que sugiere que un gene R mayor pudiera estar asociado con la resistencia. Se detectó un QTL mayor para la resistencia al tizón tardío en el cromosoma 10 usando tanto los datos del bioensayo de hoja desprendida como los de ensayos de campo. El marcador SNP solcap_snp_c1_15219 (26.5 cM) estaba en la punta del QTL. Adicionalmente, se ligó a un QTL menor en el cromosoma 5 a SNPs solcap_snp_c1_3793. Estos marcadores SNP muy cercanamente ligados al QTL de resistencia al tizón tardío pueden usarse para el mejoramiento asistido con marcadores.

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Manrique-Carpintero, N., Islam, M.S., Enciso-Rodríguez, F. et al. Mapping Solanum berthaultii-based Late Blight (Phytophthora infestans) Resistance in a Diploid Population. Am. J. Potato Res. 97, 596–604 (2020). https://doi.org/10.1007/s12230-020-09808-x

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