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  • 1
    Electronic Resource
    Electronic Resource
    POTATO FLAVOR AS RELATED TO CHEMICAL COMPOSITION (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 36 (1971), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: SUMMARY— A study was made on the relationship of flavor of potatoes to their phenolic and ascorbic acid content. Material for the study was from two main sources: (1) clones that are hybrids between varieties of Solanum tuberosum subsp. tuberosum grown in New York and varieties of Solanum tuberosum subsp. andigenum grown in Peru; (2) established commercial American varieties such as Ontario, Pontiac, and Katahdin. Bitterness and astringency were selected as the character notes most related to phenolic content. A significant correlation was found between phenolic content and bitterness and a highly significant correlation between phenolic content and astringency. No significant correlation was found between ascorbic acid content and flavor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1971.tb06387.x
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  • 2
    Electronic Resource
    Electronic Resource
    Resistance to viruses in F1 hybrids produced by direct crossing between diploid Solanum series Tuberosa and diploid S. brevidens (series Etuberosa) using S. phureja for rescue pollination (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 114 (1995), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Resistance to potato viruses was examined in the F1 hybrids (TET) obtained from a cross between a diploid (2n = 24), tuber-bearing interspecific hybrid 87HW13.7 (Solanum tuberosum W231 ×S. multi-dissectum PI 473354) and a diploid (2n = 24), nontuber-bearing wild potato species (S. brevidens CPC 2451) using S. phureja IvP35 (2n = 24) for rescue pollination. The parental plants were susceptible to PVX, whereas two hybrids (TET38.2 and TET38.9) and S. phureja IvP35 reacted with hypersensitivity to PVX. Two hybrids (TET 38.9 and TET 38.12) were extremely resistant to PVY°, which was similar to S. brevidens and S. phureja IvP35, whereas the remaining two hybrids were moderately resistant to PVY°. No resistance to PVA and PLRV was observed in the progenies, in contrast to S. brevidens which was extremely resistant to PVA and PLRV. Hypersensitivity to PVX in two progenies suggested (1) integration by somatic translocation or heterofertilization and expression of genes from the rescue pollinator S. phureja IvP35, or (2) transgressive or complementary gene action.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1995.tb00824.x
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  • 3
    Electronic Resource
    Electronic Resource
    QTL analysis of trichome-mediated insect resistance in potato (1994)
    Springer
    Theoretical and applied genetics 87 (1994), S. 973-987 
    Details
    ISSN: 1432-2242
    Keywords: Potato ; Trichome ; Insect resistance ; RFLP ; QTL
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Genetic mapping of several components of a complex type of insect resistance has been undertaken as a means toward more efficient use of the valuable characteristics of a wild relative of potato. RFLP maps constructed on interspecific diploid progenies of Solanum tuberosum × S. berthaultii were used in conjunction with morphological, biochemical and biological phenotyping to identify quantitative trait loci (QTLs) contributing to trichome-mediated insect resistance. By superimposing QTL data for a wide range of phenotypes including biochemical assays, correlative and direct screens for insect resistance, and adaptation to the target environment on the genetic maps, we have addressed the organization, action and interaction of genes controlling the resistance mechanism. The outcome contributes to an understanding of the association between component traits and between desirable and undesirable features of the donor species generated in an applied breeding program. Research is proceeding toward the development of selectable markers for the introgression and transfer of this resistance among potato gene pools.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00225792
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  • 4
    Electronic Resource
    Electronic Resource
    QTL analysis of potato tuber dormancy (1996)
    Springer
    Theoretical and applied genetics 93 (1996), S. 317-324 
    Details
    ISSN: 1432-2242
    Keywords: Key words Solanum tuberosum  ;  Solanum berthaultii  ; QTL  ;  Potato  ;  Dormancy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The potential loss of chemical sprout inhibitors because of public concern over the use of pesticides underscores the desirability of breeding for long dormancy of potato (Solanum tuberosum L.) tubers. Quantitative trait locus (QTL) analyses were performed in reciprocal backcrosses between S. tuberosum and S. berthaultii toward defining the complexity of dormancy. S. berthaultii is a wild Bolivian species characterized by a short-day requirement for tuberization, long tuber dormancy, and resistance to several insect pests. RFLP alleles segregating from the recurrent parents as well as from the interspecific hybrid were monitored in two segregating progenies. We detected QTLs on nine chromosomes that affected tuber dormancy, either alone or through epistatic interactions. Alleles from the wild parent promoted dormancy, with the largest effect at a QTL on chromosome 2. Long dormancy appeared to be recessive in the backcross to S. berthaultii (BCB). In BCB the additive effects of dormancy QTLs accounted for 48% of the measured phenotypic variance, and adding epistatic effects to the model explained only 4% more. In contrast, additive effects explained only 16% of the variance in the backcross to S. tuberosum (BCT), and an additional 24% was explained by the inclusion of epistatic effects. In BCB variation at all QTLs detected was associated with RFLP alleles segregating from the hybrid parent; in BCT all QTLs except for two found through epistasis were detected through RFLP alleles segregating from the recurrent parent. At least three dormancy QTLs mapped to markers previously found to be associated with tuberization in these crosses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050283
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  • 5
    Electronic Resource
    Electronic Resource
    QTL analysis of potato tuberization (1996)
    Springer
    Theoretical and applied genetics 93 (1996), S. 307-316 
    Details
    ISSN: 1432-2242
    Keywords: Key words  Solanum tuberosum  ;  Solanum berthaultii  ; QTL  ;  Potato  ;  Tuberization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract   Quantitative trait loci (QTLs) affecting tuberization were detected in reciprocal backcrosses between Solanum tuberosum and S. berthaultii. Linkage analyses were performed between traits and RFLP alleles segregating from both the hybrid and the recurrent parent using a set of framework markers from the potato map. Eleven distinct loci on seven chromosomes were associated with variation in tuberization. Most of the loci had small effects, but a QTL explaining 27% of the variance was found on chromosome 5. More QTLs were detected while following alleles segregating from the recurrent S. tuberosum parent used to make the backcross than were detected by following alleles segregating from the hybrid parent. More than half of the alleles favoring tuberization were at least partly dominant. Tuberization was favored by an allele from S. berthaultii at 3 of the 5 QTLs detected by segregation from the hybrid parent. The additive effects of the QTLs for tuberization explained up to 53% of the phenotypic variance, and inclusion of epistatic effects increased this figure to 60%. The most common form of epistasis was that in which presence of an allele at each of 2 loci favoring tuberization was no more effective than the presence of a favorable allele at 1 of the 2 loci. The QTLs detected for tuberization traits are discussed in relationship to those previously detected for trichome-mediated insect resistance derived from the unadapted wild species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050282
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  • 6
    Electronic Resource
    Electronic Resource
    A test of the maximum heterozygosity hypothesis using molecular markers in tetraploid potatoes (1993)
    Springer
    Theoretical and applied genetics 86 (1993), S. 481-491 
    Details
    ISSN: 1432-2242
    Keywords: Potato ; Heterozygosity ; Heterosis ; RFLP ; Polyploids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract It has been theorized that in cross-pollinated polyploid species hybrid vigor is maximized by the frequent occurrence of more than two alleles per chromosomal locus. In polyploid crops this condition of maximum heterozygosity has been reported to be associated with increased yield and optimum field performance. We report herein the first direct test of the maximum heterozygosity hypothesis. Molecular markers were used to examine the association between maximum heterozygosity and several components of yield in three different populations of tetraploid potatoes. The results indicate that the value of maximum heterozygosity is not universal but dependent on the genetic background of the material under evaluation. In a cross between adapted breeding lines, homozygosity was negatively correlated with tuber yield, and maximum heterozygosity was positively correlated with the proportion of tuber yield in the large-size fraction. In contrast, in crosses between adapted and unadapted parents, maximum heterozygosity had no detectable effect on any character. Quantitative trait locus (QTL) analysis of the three populations reveals that, regardless of the genetic background, additive genetic effects are more strongly correlated with the components of yield than are any measures of heterozygosity and that some common QTLs may be influencing yield in all three populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00838564
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  • 7
    Electronic Resource
    Electronic Resource
    Mapping and marker-assisted selection for a gene for extreme resistance to potato virus Y (1997)
    Springer
    Theoretical and applied genetics 94 (1997), S. 192-197 
    Details
    ISSN: 1432-2242
    Keywords: Key words Potato virus Y ; Resistance gene ; Solanum tuberosum subsp. andigena ; Potato ; RFLP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The chromosomal location of the major gene Ry adg controlling extreme resistance to potato virus Y (PVY) in Solanum tuberosum subsp. andigena was identified by RFLP analysis of a diploid potato population. A total of 64 tomato and potato RFLP markers were screened with the bulked segregant analysis (BSA) on segregants extremely resistant, hypersensitive or susceptible to PVY. Four markers TG508, GP125, CD17 and CT168 at the proximal end of chromosome XI showed close linkage with extremely resistant phenotypes. TG508 was identified as the closest marker linked with the Ry adg locus with the maximum map distance estimated as 2.0 cM. The 4 markers linked with the Ry adg locus were tested on independent tetraploid and diploid potato clones and were subsequently found useful for marker-assisted selection for plants containing Ry adg .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050399
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  • 8
    Electronic Resource
    Electronic Resource
    QTL analysis of potato tuber dormancy (1996)
    Springer
    Theoretical and applied genetics 93 (1996), S. 317-324 
    Details
    ISSN: 1432-2242
    Keywords: Solanum tuberosum ; Solanum berthaultii ; QTL ; Potato ; Dormancy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The potential loss of chemical sprout inhibitors because of public concern over the use of pesticides underscores the desirability of breeding for long dormancy of potato (Solanum tuberosum L.) tubers. Quantitative trait locus (QTL) analyses were performed in reciprocal backcrosses between S. tuberosum and S. berthaultii toward defining the complexity of dormancy. S. berthaultii is a wild Bolivian species characterized by a short-day requirement for tuberization, long tuber dormancy, and resistance to several insect pests. RFLP alleles segregating from the recurrent parents as well as from the interspecific hybrid were monitored in two segregating progenies. We detected QTLs on nine chromosomes that affected tuber dormancy, either alone or through epistatic interactions. Alleles from the wild parent promoted dormancy, with the largest effect at a QTL on chromosome 2. Long dormancy appeared to be recessive in the backcross to S. berthaultii (BCB). In BCB the additive effects of dormancy QTLs accounted for 48% of the measured phenotypic variance, and adding epistatic effects to the model explained only 4% more. In contrast, additive effects explained only 16% of the variance in the backcross to S. tuberosum (BCT), and an additional 24% was explained by the inclusion of epistatic effects. In BCB variation at all QTLs detected was associated with RFLP alleles segregating from the hybrid parent; in BCT all QTLs except for two found through epistasis were detected through RFLP alleles segregating from the recurrent parent. At least three dormancy QTLs mapped to markers previously found to be associated with tuberization in these crosses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223171
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  • 9
    Electronic Resource
    Electronic Resource
    Insect-resistant plants with improved horticultural traits from interspecific potato hybrids grown in vitro (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 95-104 
    Details
    ISSN: 1432-2242
    Keywords: Solanum tuberosum ; Solanum berthaultii ; Insect resistance ; Introgression ; Potato somaclonal variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Plants were regenerated from petiole calli of interspecific hybrids of Solanum tuberosum x S. berthaultii, an insect-resistant wild species. Callus culture was used to generate genetic changes to overcome the restricted recombination between the two genomes. Two plants out of 58 (3.5%) from calli of hybrid J114-1 showed stable and heritable differences from the hybrid over two cycles of evaluations in the field. Replicated trials were conducted in 1987 and 1988, using two populations of plants propagated by nodal cuttings from the original regenerates maintained in vitro. One regenerate showed insect resistance and increased marketable yield (approximately two fold) in the field. The other had higher levels of phenolic exudate in one of the two types of foliar trichomes associated with the insect resistance mechanism. Some desirable changes were discernible only in sexual progeny of regenerates, not in the regenerates themselves. In a backcross to S. tuberosum, 7 of 14 (50%) regenerates from hybrid F743-4 showed more progeny (up to 15-fold) with improved trichome traits and horticultural characteristics than the original hybrid. The variations were not associated with changes in ploidy. Fifteen plants obtained from these crosses are currently being incorporated into breeding lines. These results suggest that a period of callus culture followed by plant regeneration may aid in the introgression of desirable traits from wild species into crop plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224021
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  • 10
    Electronic Resource
    Electronic Resource
    QTL analysis of potato tuberization (1996)
    Springer
    Theoretical and applied genetics 93 (1996), S. 307-316 
    Details
    ISSN: 1432-2242
    Keywords: Solanum tuberosum ; Solanum berthaultii ; QTL ; Potato ; Tuberization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Quantitative trait loci (QTLs) affecting tuberization were detected in reciprocal backcrosses between Solanum tuberosum and S. berthaultii. Linkage analyses were performed between traits and RFLP alleles segregating from both the hybrid and the recurrent parent using a set of framework markers from the potato map. Eleven distinct loci on seven chromosomes were associated with variation in tuberization. Most of the loci had small effects, but a QTL explaining 27% of the variance was found on chromosome 5. More QTLs were detected while following alleles segregating from the recurrent S. tuberosum parent used to make the backcross than were detected by following alleles segregating from the hybrid parent. More than half of the alleles favoring tuberization were at least partly dominant. Tuberization was favored by an allele from S. berthaultii at 3 of the 5 QTLs detected by segregation from the hybrid parent. The additive effects of the QTLs for tuberization explained up to 53% of the phenotypic variance, and inclusion of epistatic effects increased this figure to 60%. The most common form of epistasis was that in which presence of an allele at each of 2 loci favoring tuberization was no more effective than the presence of a favorable allele at 1 of the 2 loci. The QTLs detected for tuberization traits are discussed in relationship to those previously detected for trichome-mediated insect resistance derived from the unadapted wild species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223170
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