Transmission of resistance to common scab from the diploid to the tetraploid level via 4x-2x crosses in potatoes

Murphy, A. M.; Jong, H. De; Tai, G. C. C.

doi:10.1007/bf00029565

Cited by 32 publications

(18 citation statements)

References 11 publications

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“…Finally, Alam (1972) concluded that two independent loci were required, a dominant allele at one locus and homozygous recessive alleles at the second locus. Murphy et al (1995) transmitted scab resistance from the diploid to the tetraploid level and their evidence supported the hypothesis developed by Alam. All of these studies, however, were poorly designed to determine the inheritance of scab resistance, which may be quite different from the authors' speculations.…”

Section: Introductionsupporting

confidence: 75%

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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Section: Introductionsupporting

confidence: 75%

Heritability of Resistance to Common Scab in Diploid Potatoes

et al. 2009

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“…The 4x · 2x scheme is also valuable for transferring disease and stress resistance to the tetraploid level (Iwanaga et al 1989;Herriott et al 1990;Watanabe et al 1992;Murphy et al 1995;Watanabe et al 1999;Sterrett et al 2003). Resistance to root knot nematodes, early blight, bacterial wilt, common scab, and internal heat necrosis in diploids can be transmitted to the tetraploid level via 2n gametes.…”

Section: Polyploid Offspringmentioning

confidence: 96%

Advantages of Wild Diploid Solanum Species Over Cultivated Diploid Relatives in Potato Breeding Programs

Jansky

Peloquin

2005

Genet Resour Crop Evol

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For breeding programs of the tetraploid potato (Solanum tuberosum), both wild and cultivated diploid relatives are valuable sources of genetic diversity. While both types of germplasm are used in breeding programs, there are several advantages to using wild relatives. Diploid relatives are typically crossed with haploids (2n = 2x = 24) from tetraploid S. tuberosum to improve daylength adaptation. Most haploids are male sterile, so they are typically used as female parents. Cultivated diploids, such as members of the Phureja Group, produce male sterile hybrids when crossed as females to haploids; wild relatives, such as S. tarijense, often produce male fertile hybrids. Tuber yield following crosses of haploids to cultivated or wild relatives is often high. However, cultivated relatives generally produce hybrids with a high set of small tubers; hybrids from wild relatives are variable, but many are similar to cultivars in tuber size and set. While tubers of hybrids from cultivated relatives are typically rough, with deep eyes and raised internodes, those from wild relatives are often smooth. Tuber dormancy in hybrids with cultivated relatives is generally short, while that in hybrids with wild species is longer, allowing for storage over winter. Finally, resistance to several major diseases and stresses has been found in wild species and their hybrids with S. tuberosum haploids. The desirable traits in hybrids are transmitted to tetraploids via unilateral sexual polyploidization (4x · 2x or 2x · 4x crosses in which the diploid parent produces 2n gametes). Wild Solanum species are recommended for use in potato breeding programs as sources of genetic diversity that can be adapted easily following hybridization with S. tuberosum haploids.

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“…Research on inheritance and transmission of resistance to common scab has been reviewed on experiments with special mating designs from cultivars and diploid species (Tarn et al 1992;Wastie 1994;Murphy et al 1995). The testing methods for screening scab resistance has been reviewed by Schöber (1987) and by Tarn et al (1992).…”

Section: Introductionmentioning

confidence: 99%

Investigation of long-term field experiments on response of breeding lines to common scab in a potato breeding program

2008

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Common scab, caused by Streptomyces scabies, is a disease that produces scab-like surface lesions on potato tubers. Testing for susceptibility/ resistance of breeding lines at the Potato Research Centre of Agriculture & Agri-Food Canada (AFC) is carried out in a scab nursery maintained at AFC for the annual scab evaluation field trials. A replicated field trial routinely consists of breeding lines from previous testing season(s) plus newly selected lines. Data of scab scores generated from long-term experiments thus formulate an incomplete 2-way table over combinations of breeding lines (genotypes) and trials (years). This requires an advanced statistical method to estimate genetic parameters for evaluation purposes. A data base with 1,435 scab index scores from 344 breeding lines were extracted from 5 years (1995)(1996)(1997)(1998)(1999) of field experiments in the scab nursery maintained at AFC. The statistical method Residual Maximum Likelihood (REML) was employed to estimate variance components of the breeding population and Best Linear Unbiased Predictor (BLUP) was used to predict genetic merit of breeding lines. High heritability was obtained from variance components estimated by REML. The BLUP scores of breeding lines provided reliable evaluation of their responses to common scab. Two data base sub-sets were separately formulated from the original data base for those parents and grandparents of the breeding lines having pedigree records available. They were again subjected to REML and BLUP analyses to compare the responses to common scab and identify sources of resistance at the parental and grandparental levels. Two random data sets with equal sized samples of breeding lines were also generated from the over-all data base. The two sets of BLUP scores between corresponding breeding lines and parents showed high association which provides an assessment of the validity of the evaluation process.

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Transmission of resistance to common scab from the diploid to the tetraploid level via 4x-2x crosses in potatoes

Cited by 32 publications

References 11 publications

Heritability of Resistance to Common Scab in Diploid Potatoes

Heritability of Resistance to Common Scab in Diploid Potatoes

Advantages of Wild Diploid Solanum Species Over Cultivated Diploid Relatives in Potato Breeding Programs

Investigation of long-term field experiments on response of breeding lines to common scab in a potato breeding program

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