Scab resistance of haploids from twoSolanum tuberosum cultivars

Cipar, M. S.; Lawrence, Christopher

doi:10.1007/bf02868225

Cited by 20 publications

(16 citation statements)

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“…The genetics of tolerance/resistance remain unclear, even though several genetic studies to date have been done on haploid or diploid populations (Cipar et al 1972;Dionne and Lawrence 1961). Phenotyping common scab susceptibility is difficult because of the large variability in disease symptoms among tubers from a single plant, ranging from no common scab to severe pitting.…”

Section: Discussionmentioning

confidence: 99%

“…The genetic inheritance for tolerance to potato common scab is not clearly understood. Tolerance is believed to be quantitative (Cipar and Lawrence 1972). Alam (1972) hypothesized that two loci are responsible for scab tolerance.…”

Section: Discussionmentioning

confidence: 99%

“…Relatively little progress has been made towards developing a marker-based system for the tolerance to potato common scab. Tolerance, however, is believed to be quantitative (Cipar and Lawrence 1972).…”

Section: Introductionmentioning

confidence: 98%

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Greenhouse and Field Nursery Evaluation for Potato Common Scab Tolerance in a Tetraploid Population

et al. 2009

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Potato common scab (Streptomyces scabies (Thaxt.) Waksman & Henrici) is a major disease of potato (Solanum tuberosum L.), due to the unmarketability of affected tubers. For identification of the most common scab-tolerant material, and for developing molecular markers for common scab tolerance, more information is needed on the genetic basis of common scab tolerance. Phenotyping common scab susceptibility is difficult because of the large variability in disease symptoms among tubers from a single plant, ranging from no common scab to severe pits. Two years of field data were collected for scab reaction on a segregating tetraploid population (MSL603, 160 individuals). Continuous variation in common scab susceptibility phenotype was observed among the progeny, with a normal distribution suggesting common scab disease phenotype is a genetically complex trait. Transgressive segregants were also observed, but they are skewed toward susceptibility. A greenhouse-based screening procedure was evaluated to discern tolerant from susceptible potato lines. A subset of ten individuals from this population were selected (five resistant, five susceptible). For the greenhouse study, soil was inoculated with a pathogenic S. scabies strain MSDPZ at a concentration of 3 X 10 8 CFU/ml. This greenhouse assay effectively discerned tolerant and susceptible individuals. There was a moderate correlation between the greenhouse study and the field trial. The greenhouse assay may provide information that would complement field data in identifying resistant clones.Resumen La sarna común (Streptomyces scabies (Thaxt.) Waksman & Henrici) en una enfermedad muy importante de la papa (Solanum tuberosum L.) debido a que los tubérculos afectados no son comerciables. Para la identificación del material más tolerante a la sarna común y para desarrollar marcadores moleculares para tolerancia a la enfermedad se necesita más información sobre la base genética de la tolerancia. La fenotipificación de la susceptibilidad a la sarna común es difícil por la gran variabilidad en los síntomas de la enfermedad entre los tubérculos de una misma planta, que varían desde la ausencia de sarna a presencia de hoyos profundos en los tubérculos. Se colectaron datos durante dos años sobre la reacción a la sarna en una población tetraploide (MSL603, 160 individuos). La variación continua del fenotipo susceptible a la sarna común fue observada entre la progenie, con una distribución normal que sugiere que el fenotipo de la enfermedad es una característica genéticamente compleja. También se observó variación transgresiva, pero sesgada hacia la susceptibilidad. Un procedimiento de tamizado en invernadero fue evaluado para diferenciar las líneas de papa tolerantes de las susceptibles. Un subgrupo de 10 individuos de la población fue seleccionado (cinco resistentes, cinco susceptibles). Para el estudio de invernadero, el suelo fue inoculado con una cepa patogénica MSDPZ de S. scabies a una concentración de 3 x 10 8 UFC/ml. Este ensayo de invernadero distinguió efectivamente in...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Greenhouse and Field Nursery Evaluation for Potato Common Scab Tolerance in a Tetraploid Population

et al. 2009

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“…Some researchers have speculated that a single dominant gene governs resistance (Krantz and Eide 1941), others that a single dominant gene governs resistance but to be effective it has to occur in the duplex state (Lauer and Eide 1963), and others that more than one locus is involved (Cipar and Lawrence 1972). Finally, Alam (1972) concluded that two independent loci were required, a dominant allele at one locus and homozygous recessive alleles at the second locus.…”

Section: Introductionmentioning

confidence: 96%

Heritability of Resistance to Common Scab in Diploid Potatoes

et al. 2009

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Common scab, caused by several species of Streptomyces, is a serious soil-borne disease of potatoes that may cause superficial, raised or pitted lesions on potato tubers. Little is known about the genetic basis of resistance to this disease. The purpose of this study was to determine if genetic resistance to common scab exists in a diploid Solanum phureja-S. stenotomum (phu-stn) population and to estimate broad-sense (H) and narrow-sense (h 2 ) heritability for resistance to common scab. Two hundred seventyone clones from a randomly mated phu-stn population were grown from 2003-2005 in naturally Streptomyces infested soil on a grower's field in Northampton Co., PA, in a randomized complete block design replicated twice. After harvest, the proportion of tubers with scab lesions was determined. The variable analyzed by the general linear models procedure in SAS using the maximum likelihood estimation method was the arcsine ( √ proportion of scabby tubers). There were significant differences among clones and the year x clone interaction was significant. H for resistance was estimated as 0.18 with a 95% confidence interval of 0.15 to 0.35. The clonal source of variation was partitioned into among families and within families. All the variation occurred within families. There was no additive genetic variance for resistance in this population, hence, h 2 was estimated as 0.00. Although levels of resistance to common scab cannot be improved by breeding in this diploid population, it may be feasible to transfer the high levels of resistance in this population to the tetraploid level via 4x-2x crosses.Resumen La sarna común, causada por varias especies de Streptomyces, es una enfermedad muy importante de la papa trasmitida por el suelo que puede causar lesiones superficiales levantadas o hundidas en los tubérculos. Se conoce muy poco acerca de la base genética de la resistencia a esta enfermedad. El propósito de este estudio fue determinar si existe resistencia genética en una población diploide de Solanum phureja-S. stenotomum (phu stn) y estimar la herencia de la resistencia en el sentido amplio (H) y sentido restringido (h 2 ) a la sarna común. Se sembraron del 2003 al 2005, 271 clones de una población phu-stn apareada al azar en campo naturalmente infestado por Streptomyces de un productor en Northapton Co., PA, en un diseño de bloque completamente al azar doblemente repetido. Después de la cosecha, se determinó la proporción de tubérculos con lesiones de sarna. Se analizó la variable arco seno (√ proporción de tubérculos con sarna) mediante procedimientos del modelo linear general en SAS, utilizando el método de estimación de máxima verosimilitud. Hubo diferencias significativas entre clones y la interacción años x clon fue significativa. La H para la resistencia se estimó en 0.18 con un 95% de intervalo de confianza de 0.15 a 0.35. La fuente de variación clonal fue distribuida entre familias y dentro de familias. Toda la variación se presentó dentro de familias. No hubo variancia genética aditiva para resistencia en...

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“…Cipar & Lawrence (1972) analyzed and compared populations of haploids of the highly resistant cultivar Hindenburg and the moderately resistant cultivar Avon . On the basis of his study with 2x-2x and 2x-4x crosses, Alam (1972) developed a hypothesis for the inheritance of scab resistance .…”

Section: Introductionmentioning

confidence: 99%