Heritability of Resistance to Common Scab in Diploid Potatoes

Haynes, Kathleen G.; Christ, B. J.; Burkhart, Christopher R.; Vinyard, Bryan T.

doi:10.1007/s12230-009-9068-0

Cited by 20 publications

(11 citation statements)

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“…For common scab, previous heritability estimates are also highly variable, depending on the genetic material and the environmental conditions. For instance, using diploid potatoes derived from a cross between wild relatives ( S. phureja × S. stenotonum ) and cultivated potatoes (di-haploid S. tuberosum × S. chacoense ), Haynes et al (2009) and Braun et al (2017b) reported broad sense heritability estimates ranging from 0.18 to 0.72 for different environments. However, studies involving tetraploid potatoes have reported higher heritability estimates with values ranging from 0.32 to 0.93 ( Haynes et al 1997 ; Bradshaw et al 2008 ; Tai et al 2009 ).…”

Section: Discussionmentioning

confidence: 99%

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Genomic Selection for Late Blight and Common Scab Resistance in Tetraploid Potato (Solanum tuberosum)

Enciso-Rodríguez¹,

Douches²,

Lopez‐Cruz³

et al. 2018

G3 Genes|Genomes|Genetics

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Potato (Solanum tuberosum) is a staple food crop and is considered one of the main sources of carbohydrates worldwide. Late blight (Phytophthora infestans) and common scab (Streptomyces scabies) are two of the primary production constraints faced by potato farming. Previous studies have identified a few resistance genes for both late blight and common scab; however, these genes explain only a limited fraction of the heritability of these diseases. Genomic selection has been demonstrated to be an effective methodology for breeding value prediction in many major crops (e.g., maize and wheat). However, the technology has received little attention in potato breeding. We present the first genomic selection study involving late blight and common scab in tetraploid potato. Our data involves 4,110 (Single Nucleotide Polymorphisms, SNPs) and phenotypic field evaluations for late blight (n=1,763) and common scab (n=3,885) collected in seven and nine years, respectively. We report moderately high genomic heritability estimates (0.46 ± 0.04 and 0.45 ± 0.017, for late blight and common scab, respectively). The extent of genotype-by-year interaction was high for late blight and low for common scab. Our assessment of prediction accuracy demonstrates the applicability of genomic prediction for tetraploid potato breeding. For both traits, we found that more than 90% of the genetic variance could be captured with an additive model. For common scab, the highest prediction accuracy was achieved using an additive model. For late blight, small but statistically significant gains in prediction accuracy were achieved using a model that accounted for both additive and dominance effects. Using whole-genome regression models we identified SNPs located in previously reported hotspots regions for late blight, on genes associated with systemic disease resistance responses, and a new locus located in a WRKY transcription factor for common scab.

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Section: Discussionmentioning

confidence: 99%

“…A similar result was reported under comparable conditions by Murphy et al (1995) . Results based on fields trials performed in different locations for this pathogen have shown much higher variability over the years ( Haynes et al 2009 ).…”

Section: Discussionmentioning

confidence: 99%

Genomic Selection for Late Blight and Common Scab Resistance in Tetraploid Potato (Solanum tuberosum)

Enciso-Rodríguez¹,

Douches²,

Lopez‐Cruz³

et al. 2018

G3 Genes|Genomes|Genetics

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“…, 2004; Loria et al. , 2006; Haynes et al. , 2009) but has remained elusive, and little progress has been achieved in an overall improvement in scab resistance amongst cultivars (Douches et al.…”

Section: Introductionmentioning

confidence: 99%

Elimination of common scab sensitive progeny from a potato breeding population using thaxtomin A as a selective agent

et al. 2010

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Common scab is one of the most important soil-borne diseases of potato and is difficult to control. Selection of potato breeding lines for resistance to common scab is also cumbersome due to environmental factors influencing symptom development and an erratic spatial distribution of the scab pathogens (Streptomyces spp.) in the field. The bacterial phytotoxin thaxtomin A, which causes scab symptoms, can be used to screen large numbers of potato seedlings for tolerance in vitro, but few studies have investigated whether the results correspond to resistance to common scab observed in the field. In this study, 120 F1 potato progeny from a single cross were screened in vitro by exposing the seedlings to thaxtomin A added to the culture medium. Eighteen genotypes were selected based on high sensitivity or tolerance using shoot growth as the criterion, multiplied in vitro, and tested for resistance to common scab caused by S. turgidiscabies and S. scabies in a glasshouse and in three different fields. Evaluation of ca. 6500 tubers showed that the 18 potato genotypes differed in scab indices and disease severity (P < 0AE0001). The relative shoot height in vitro (thaxtomin A used at 0AE5 lg mL ) and the scab index in the field showed significant correlation (r s = )0AE463, P = 0AE0528, n = 18), also consistent with the results obtained under controlled conditions in the glasshouse. Hence, the in vitro bioassay may be used to discard scab-susceptible genotypes and elevate the overall levels of common scab resistance in the potato breeding populations.

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“…In addition, stability analysis indicated that clones with the least severe scab phenotypes were also the most phenotypically unstable. Haynes et al (2009) found that there was no additive genetic variance for resistance to common scab in a diploid population of potatoes, although high levels of resistance to common scab existed in the population. However, because the diploid tubers were much smaller than tetraploid tubers, they were only able to analyze the proportion of scabby tubers rather than AI and LI.…”

Section: Introductionmentioning

confidence: 94%

Common Scab Trials of Potato Varieties and Advanced Selections at Three U.S. Locations

et al. 2010

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Common scab (CS), caused by Streptomyces spp., is a soil-borne bacterial disease of potato tubers which may cause superficial, raised, or pitted lesions. The results of screening potato germplasm for severity of CS can be variable, necessitating testing over multiple environments. The purposes of this study were to evaluate advanced germplasm from public potato breeding programs in different regions of the United States for their reaction to CS, estimate broad-sense heritability for resistance, and identify clones with stable resistance. Seventeen to 23 clones per year were evaluated at each of three locations (ID, ME, MN) from 2002 to 2007. After harvest, each tuber was scored for the percent of surface area covered with lesions and the type of lesion. These scores were converted to an area index (AI) and a lesion index (LI). AI, LI, and the arcsine √ proportion scabby tubers (PS) were analyzed as normally distributed responses. There were significant differences among clones for AI in 2 years, LI in 5 years, and PS in 3 years. There were significant clone x location interactions for AI and PS all 6 years, and LI in 5 years. Broad-sense heritability for AI, LI, and PS ranged from 0 to 0.78, 0.49 to 0.90, and 0.30 to 0.80, respectively. Evaluation at multiple sites remains important for characterizing the reaction of potato germplasm to CS.Resumen La roña común (CS), causada por Streptomyces spp., es una enfermedad bacteriana de los tubérculos de la papa, que puede causar lesiones superficiales, elevadas o punteadas. Los resultados en las evaluaciones del germoplasma de papa pueden variar en severidad de CS, requiriéndose pruebas en múltiples ambientes. Los propó-sitos de este estudio fueron evaluar germoplasma avanzado de programas públicos de mejoramiento de papa en diferentes regiones de Estados Unidos para su reacción a CS, estimar la heredabilidad para la resistencia en un sentido amplio, e identificar clones con resistencia estable. Se evaluaron anualmente de 17 a 23 clones en cada una de tres localidades (ID, ME, MN) del 2002 al 2007. Después de la cosecha, cada tubérculo fue cuantificado en porcentaje de área de la superficie cubierta con lesiones y de qué tipo. Estas evaluaciones se convirtieron a un índice de área (AI) y a un índice de lesión (LI). Se analizaron AI, LI, y la proporción √ arcoseno de tubérculos con roña (PS) como respuestas en una distribución normal. Hubo diferencias significativas entre clones para AI en dos años, LI en cinco años, y PS en tres años. Hubo interacciones significativas de clon x localidad para AI y PS en los seis años, y LI en Funded in part by the USDA/ARS Potato Special Grants Program. Electronic supplementary material The online version of this article (

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Heritability of Resistance to Common Scab in Diploid Potatoes

Cited by 20 publications

References 20 publications

Genomic Selection for Late Blight and Common Scab Resistance in Tetraploid Potato (Solanum tuberosum)

Genomic Selection for Late Blight and Common Scab Resistance in Tetraploid Potato (Solanum tuberosum)

Elimination of common scab sensitive progeny from a potato breeding population using thaxtomin A as a selective agent

Common Scab Trials of Potato Varieties and Advanced Selections at Three U.S. Locations

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