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  • 1
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    Inheritance of tristyly in Oxalis tuberosa (Oxalidaceae) (2001)
    Springer Nature
    Details
    Publication Date: 2001-01-01
    Print ISSN: 0018-067X
    Electronic ISSN: 1365-2540
    Topics: Biology
    Published by Springer Nature
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation and analysis of reduction of late blight disease in a diploid potato progeny (2001)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 50 (2001), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The rate of late blight disease was analysed for individuals of a diploid Solanum phureja–Solanum tuberosum dihaploid hybrid population (PD), using three different assessment techniques, in the laboratory, screenhouse, and field. These hybrids expressed low disease rates in the field, comparable to resistance based on intact R genes. However, none of the parents of PD expressed any R genes and the pattern of segregation within the PD population was not indicative of R-gene inheritance. The foliage (or leaflet) area diseased had the largest broad-sense heritability of all criteria analysed, in all tests performed. In the field evaluations, the PD population showed intermediate levels of broad-sense heritability for foliage area diseased, relative to the much larger heritability detected for the group of controls possessing R genes. Resistance in the field of the PD hybrids had very little genotype-environment (G × E) interaction, indicating stability of its expression. All genotypes without R genes exhibited heritable, reduced rates of late blight disease in the field, but they were susceptible with low heritability in screenhouse and laboratory tests. This differential expression of disease indicates that the plants' indirect response to unknown environmental stress in the field may have been measured. The value of the PD hybrids for breeding of late blight resistant potato and the use of the disease rate data for detection of the underlying quantitative trait loci are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.2001.00567.x
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  • 3
    Electronic Resource
    Electronic Resource
    A new look at incompatibility relationships in higher plants (1993)
    Springer
    Sexual plant reproduction 6 (1993), S. 183-190 
    Details
    ISSN: 1432-2145
    Keywords: Gametophytic incompatibility ; Self-incom-patibility ; Unilateral interspecific incompatibility ; Potato (Solanum) species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Pollen tube growth was evaluated using an 18-step scale after both intra- and interspecific pollinations of genotypically widely differing diploid potato species and potato dihaploids expressing monofactorial gametophytic incompatibility. The results obtained account for a wide array of types of pollen tube growth resulting from crossing partners with distinct incompatibility behavior. Based on the assumption that inhibition of pollen tubes is the rule and solely prevented by the pollen itself, a model proposing one common cause underlying different mechanisms for both intraspecific selfincompatibility and interspecific incompatibility in diploids is put forward. Data supporting the model are presented from the experimental results of this study and from the literature. The strength of pollen-style interaction depends on particular S-alleles in combination with recognition and activity properties of the basic S-genotypes. The model is suitable to explain all former observations on incompatibility in diploids with a gametophytic system of incompatibility and, with modifications of the manner of phenotypic expression, also in plants with sporophytic incompatibility. The proposed scheme of pollen tube growth phenotypes permits prediction of pollen tube growth behavior in an intended cross combination. The model is based on both classical Mendelian genetics and recent molecular genetic insight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228647
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  • 4
    Electronic Resource
    Electronic Resource
    Expression of stylar incompatibility in the Andean clonal tuber crop oca (Oxalis tuberosa Mol., Oxalidaceae) (2000)
    Springer
    Sexual plant reproduction 13 (2000), S. 105-111 
    Details
    ISSN: 1432-2145
    Keywords: Key words Oca ; Oxalis tuberosa ; Floral heteromorphy ; Self-incompatibility ; Pollen fertility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Long-, mid-, and short-styled clonal accessions of oca (Oxalis tuberosa) were intercrossed in a complete diallelic design. Pollen tube growth in styles was monitored in all diallelic crosses. Pollen fertility was estimated by two tests: staining of pollen grains with aceto-carmine and detection of β-galactosidase activity by the substrate X-Gal. The two methods of pollen fertility estimation were equally useful to detect fertility levels. Pollen originating from short stamens had the highest fertility (85%) and pollen from long stamens had the lowest fertility (70%). Pollen fertility was high throughout, but its degree varied with the stylar morph on which the pollen was formed. Long-styled accessions had the highest rates of fertile pollen. Differences in pollen fertility at different anther levels in the same style morph were also apparent. Pollen grain diameter of the six morph-anther level combinations was inversely correlated with pollen fertility. Pollen grains from long stamens were the largest and pollen grains from short stamens were the smallest. Neither pollen fertility nor pollen grain size had an influence on pollen tube growth in the style or on fruit and seed set. Pollen tubes growing within the styles were inhibited at a different level for each of the 18 cross combinations in the diallel. Although legitimate crosses had greatest pollen tube growth, some of the illegitimate inter- and intramorph crosses had equally high scores. Of all illegitimate crosses, mid-styled seed parents had the lowest level of stylar incompatibility. Fruit and seed set were highly correlated with the extent of pollen tube growth in the style. The number of pollen tubes entering ovules in a flower was in good agreement with the number of seeds produced per fruit. Therefore, it is concluded that stylar incompatibility is the major determinant of limited seed formation in oca even in the most successful legitimate cross combinations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004970000040
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  • 5
    Electronic Resource
    Electronic Resource
    Female fertility of potato (Solanum tuberosum ssp. tuberosum) dihaploids (1995)
    Springer
    Euphytica 81 (1995), S. 27-33 
    Details
    ISSN: 1573-5060
    Keywords: Solanum tuberosum ssp. tuberosum ; potato breeding ; dihaploids ; female fertility ; botanical seed
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Results of testcrosses and seed set data of the dihaploid breeding program at the Potato Research Institute in Gross Lüsewitz, Germany, indicate that the low level of female fertility could hinder success in crossing work. With the objective to reveal major components of female fertility, the behavior of 47 outstanding potato dihaploids (S. tuberosum ssp. tuberosum, 2n=2x=24) was assessed in testcrosses over a period of 3 years. Analysis of variance was carried out for the traits: number of seed per berry (S/B), number of intact seed per berry (IS/B), and number of non-germinable seed per berry (NGS/B). Significant sources of variation included cross combinations, years, and cross combination-year interactions. More than 20 S/B were obtained in 25.4% of all cross combinations performed over 3 years using up to three pollinators. Berry set was not correlated to seed set, but was in general determined by the pollinator used. The number of seedless berries (SLB/F) was related to neither total berry set nor seed production. The trait S/B remained stable over different years, and thus it deemed to be most useful as a measure of the level of female fertility in practical breeding work. Selection for female fertility in early generations of a breeding program is recommended to avoid limitations in the production of variability via sexual recombination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022456
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of pollen tube growth in situ to investigate self-incompatibility in the wild potato Solanum commersonii (1995)
    Springer
    Euphytica 86 (1995), S. 149-156 
    Details
    ISSN: 1573-5060
    Keywords: Solanum commersonii ; self-incompatibility ; S-alleles ; pollen tube growth ; diallelic crossing design
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Pollen tube growth was investigated in a diallelic crossing design with seven genotypes of the diploid wild potato species Solanum commersonii, accession O/S UR-9, CIP 762459. Pollen tube growth in the style was recorded using a combined quantitative and qualitative evaluation scale. Clear-cut differences in pollen tube growth behavior in compatible and in partially or completely incompatible crosses were detected. Diallelic crossing of the seven randomly chosen genotypes, intercrossing within two progeny families, and backcrossing of two progeny populations to the parents revealed the existence of a one-locus gametophytic system of stylar incompatibility. The S-allele status of all genotypes investigated was determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022021
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