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  • 1
    Electronic Resource
    Electronic Resource
    Identification of AFLP and SSR markers associated with quantitative resistance to Globodera pallida (Stone) in tetraploid potato (Solanum tuberosum subsp. tuberosum) with a view to marker-assisted selection (1998)
    Springer
    Theoretical and applied genetics 97 (1998), S. 202-210 
    Details
    ISSN: 1432-2242
    Keywords: Key words Potato ; Solanum tuberosum ; Nematode resistance ; Globodera pallida ; Linkage in autotetraploids ; Quantitative trait locus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Seventy eight clones from the cross between SCRI clone 12601ab1 and cv Stirling were used to explore the possibility of genetical linkage analysis in tetraploid potato (Solanum tuberosum subsp. tuberosum). Clone 12601ab1 had quantitative resistance to Globodera pallida Pa2/3 derived from S. tuberosum subsp. andigena. The strategy adopted involved identifying single- (simplex) and double- (duplex) dose AFLP markers in the parents from segregation ratios that could be unambiguously identified in their offspring, detecting linkage between a marker and a putative quantitative trait locus (QTL) for resistance, and placing the QTL on the linkage map of markers. The numbers of scorable segregating markers were 162 simplex ones present only in 12601ab1, 87 present in Stirling, and 32 present in both; and 72 duplex markers present only in 12601ab1 and 45 present in Stirling. The total map length was 990.9 cM in 12601ab1 and 484.6 cM in Stirling. A QTL with a resistance allele present in double dose (QQqq) in 12601ab1 was inferred from the associations between resistance scores (square root of female counts) and two duplex markers linked in coupling, which, in turn, were linked in coupling to four simplex markers also associated with resistance, but to a lesser degree. The largest marker class difference was the one for the duplex marker P61M34=15. It accounted for 27.8% of the phenotypic variance in resistance scores, or approximately 30% of the genotypic variance. Subsequently, this duplex marker was found to be linked in coupling with a duplex SSR allele Stm3016=a, whose locus was shown to be on chromosome IV in a diploid reference mapping population. The other QTLs for resistance segregating in the progeny were not identified for one or more of the following reasons: the markers did not cover the whole of the genome, there were unfavourable repulsion linkages between the QTLs and markers, or the gene effects were not large enough to be detected in an experiment of the size conducted. It is concluded that prospects appear good for detecting QTLs and using marker-assisted selection in a tetraploid potato breeding programme, provided that, in future, the population size is increased to over 250 and more SSR markers are used to complement the AFLPs; the same is likely to be true for other autotetraploid crops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050886
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of resistance toFusarium spp. of glasshouse-and field-grown tuber progenies of potato (1995)
    Springer
    Potato research 38 (1995), S. 345-351 
    Details
    ISSN: 1871-4528
    Keywords: disease screening ; progeny test ; Fusarium coeruleum ; Fusarium sulphureum ; Gibberella pulicaris ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Field-grown tubers of 22 progenies ofSolanum tuberosum L. generated in a crossing programme involving seven parents differing in resistance toFusarium coeruleum Lib. ex Sacc. andF. sulphureum Schlect. (=F. sambucinum Fuckel, teleomorphGibberella pulicaris (Fr.) Sacc.) were wound-inoculated with a cornmeal + sand culture of each pathogen. Parental genotypes were also included. The mean lesion size of each progeny was compared in 2 years of tests, as well as with published data on glasshouse-grown tubers. ForF. coeruleum there was a high correlation between years as well as with the glasshouse data, but no such correlations were apparent withG. pulicaris. Furthermore, parental and GCA values, as well as progeny means and mid-parent scores, also correlated highly forF. coeruleum but not forG. pulicaris. Glasshouse-grown tubers of 11 wildSolanum spp. were also inoculated with both pathogens. Some resistance to one or other, or both, was apparent, particularly inS. chacoense.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02357739
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  • 3
    Electronic Resource
    Electronic Resource
    Inheritance of resistance toFusarium spp. and toPhytophthora infestans in crosses between Neotuberosum and Tuberosum potatoes estimated by seedling tests (1998)
    Springer
    Potato research 41 (1998), S. 267-275 
    Details
    ISSN: 1871-4528
    Keywords: potato ; dry rot ; Fusarium coeruleum ; F. sulphureum ; general combining abilities
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Neotuberosum clones with differing levels of resistance toFusarium coeruleum andFurarium sulphureum, and putative resistance toPhytophthora infestans, were selected and used in crosses with Tuberosum clones. The resulting progenies were assessed for their resistance to each of these pathogens and for breeders' preference. There was little correlation between disease scores for the twoFusarium species (r=0.21 and 0.34 for the Neotuberosum and hybrid clones respectively), indicating that resistance to each species is distinct. Statistical analyses revealed differences between the Neotuberosum parents and between the Tuberosum parents for all traits, but the Neotuberosum differences for late blight were not significant (P=0.10–0.05) when tested against the interaction between the two sets of parents. The interaction was significant forF. coeruleum and breeders' preference, but notF. sulphureum. No reciprocal differences were found. The only statistically significant correlation between traits for the 72 progenies was a small one (r=0.33; P=0.01–0.001) between the twoFusarium species; for all other pairs of traits r was less than 0.10. It is concluded that there are good prospects for combinding resistances to the twoFusarium species from different sources and also for achieving high levels of other desirable characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358196
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  • 4
    Electronic Resource
    Electronic Resource
    Assessing general combining ability for late blight resistance and tuber characteristics by means of glasshouse seedling tests (1993)
    Springer
    Potato research 36 (1993), S. 353-357 
    Details
    ISSN: 1871-4528
    Keywords: foliage blight ; tuber blight ; Phytophthora infestans ; breeders' preference score ; specific combining ability ; potato ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Screening tests to detect resistance to late blight in both foliage and tubers were done on glasshouse-grown seedling progenies in parallel with visual assessments by three experienced potato breeders of the yield and quality of glasshouse-grown tubers of the same progenies. There were large differences between the parents of the progenies in their general combining ability (GCA) for both foliage and tuber blight, despite some variation due to specific combining ability for foliage blight. There were also differences between parents in their GCAs for visual preference scores, but these GCAs and those for blight resistance were not correlated. The blight-resistant cv. Stirling had the best combination of high GCAs for all three attributes. The use of these and other seedling progeny tests in a multitrait genotypic recurrent selection scheme is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02361802
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  • 5
    Electronic Resource
    Electronic Resource
    Soft-rot resistance combined with other tuber characters in long day-adaptedSolanum phureja (1998)
    Springer
    Potato research 41 (1998), S. 69-82 
    Details
    ISSN: 1871-4528
    Keywords: potato ; diploid ; Erwinia ; yield ; tuber characters ; breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Offspring were produced from a cross between two long-day-adaptedSolanum phureja clones which carried resistance to tuber soft rot (Erwinia carotovora subsp.atroseptica). In tests carried out on the produce of field-grown plants raised from tubers, over fifty per cent of the 173 offspring were found to be highly resistant. Assessments were also carried out of tuber yield, mean tuber weight, tuber number, shape, regularity, flesh colour, texture of the steamed flesh, fry colour, after-cooking blackening, sprout length after storage and overall dormancy. There were statistically significant differences between clones for all characters (P〈0.001). Twelve of the clones were selected on the basis of high resistance, yield, tuber weight, regularity of shape and absence of after-cooking blackening. The value of resistant long-day-adapted diploid material for commercial breeding is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360263
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  • 6
    Electronic Resource
    Electronic Resource
    Long-day-adaptedSolanum phureja as a source of resistance to blackleg caused byErwinia carotovora subsp.atroseptica (2000)
    Springer
    Potato research 43 (2000), S. 279-285 
    Details
    ISSN: 1871-4528
    Keywords: potato ; wild species ; disease ; bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Long-day-adaptedSolanum phureja clones were assessed for resistance to blackleg caused byErwinia carotovora subsp.atroseptica under field and controlled environmental conditions over two years. In the field, twenty-two of the twenty-three clones ofS. phureja assessed were as resistant to blackleg as the commercial cultivar Ailsa, the most resistant control, and were significantly (P〈0.001) more resistant than the intermediate and susceptible cultivars Wilja and Estima, respectively. Under controlled environmental conditions, resistance in commercial cultivars was more easily overcome. However, 18 of the 21S. phureja clones assessed were significantly more resistant to blackleg than these cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358087
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  • 7
    Electronic Resource
    Electronic Resource
    Assessing general combining ability for gangrene resistance by means of a glasshouse seedling test (1996)
    Springer
    Potato research 39 (1996), S. 179-183 
    Details
    ISSN: 1871-4528
    Keywords: Phoma foveata ; potato breeding ; potato ; Solanum tuberosum L. ; Solanum tuberosum subsp ; andigena
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A seedling progeny test for resistance to gangrene (Phoma foveata) was used to evaluate progenies from a 15×15 half diallel set of crosses, including 14 selfs and 25 reciprocal crosses, which was originally made to investigate the inheritance of resistance to late blight and cyst nematodes. Nine out of the 14 selfs were more susceptible than the crosses involving their parents, so that overall the selfs were slightly more susceptible than the crosses, thus providing evidence of non-additive gene action in favour of resistance. However, when the selfs were omitted from the analysis, all of the variation between progenies could be attributed to differences in the General Combining Abilities (GCAs) of their parents. The four parents with the best GCAs for gangrene resistance all had sizeable contributions fromSolanum tuberosum subsp.andigena in their pedigrees.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358217
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  • 8
    Electronic Resource
    Electronic Resource
    Inheritance of resistance toFusarium spp. in tuber progenies of potato (1993)
    Springer
    Potato research 36 (1993), S. 189-193 
    Details
    ISSN: 1871-4528
    Keywords: disease screening ; progeny test ; Fusarium coeruleum ; Fusarium sulphureum ; general combining ability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Glasshouse-grown seedling tubers of 22 progenies from parents differing in resistance toFusarium coeruleum andF. sulphureum (Gibberella cyanogena) were wound-inoculated with a cornmeal + sand culture of one or other of these dry rot pathogens. WithF. coeruleum, differences between progenies were due entirely to differences in the general combining abilities (gca) of the parents. Parental and gca values were highly correlated, as were the mean resistance of a progeny and that of its parents. WithG. cyanogena the agreement between replicates was poor and differences between progenies were less clear. It is suggested that different resistance mechanisms operate against these two pathogens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360527
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  • 9
    Electronic Resource
    Electronic Resource
    Linkage analysis in tetraploid potato and association of markers with quantitative resistance to late blight (Phytophthora infestans) (1998)
    Springer
    Molecular genetics and genomics 259 (1998), S. 150-160 
    Details
    ISSN: 1617-4623
    Keywords: Key words AFLP ; Linkage map ; Solanum tuberosum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have constructed a partial linkage map in tetraploid potato which integrates simplex, duplex and double-simplex AFLP markers. The map consists of 231 maternal and 106 paternal markers with total map lengths of 990.9 cM and 484.6 cM. The longer of the two cumulative map lengths represents approximately 25% coverage of the genome. In tetraploids, much of the polymorphism between parental clones is masked by `dosage' which significantly reduces the number of individual markers that can be scored in a population. Consequently, the major advantage of using AFLPs – their high multiplex ratio – is reduced to the point where the use of alternative multi-allelic marker types would be significantly more efficient. The segregation data and map information have been used in a QTL analysis of late blight resistance, and a multi-allelic locus at the proximal end of chromosome VIII has been identified which contributes significantly to the expression of resistance. No late blight resistance genes or QTLs have previously been mapped to this location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380050800
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