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  • 1
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    Cambridge : Cambridge University Press
    Call number: QH447:213
    Keywords: Physical Chromosome Mapping / methods ; Diploidy ; Genetic Linkage ; Uniparental Disomy
    Description / Table of Contents: Machine generated contents note: Preface; 1. Introduction; 2. Meiosis and genetic recombination; 3. Estimation of recombination frequencies; 4. Determination of linkage groups; 5. Estimation of a genetic map; 6. Criteria for the evaluation of maps; 7. How to find the best map order; 8. Outbreeding species; 9. Mapping in practice; References; Answers to exercises; Index
    Abstract: "Genetic linkage maps are an increasingly important tool in both fundamental and applied research, enabling the study and deployment of genes that determine important biological traits. This concise introduction to genetic mapping in species with disomic inheritance enables life science graduate students and researchers to use mapping software to produce more reliable results. After a brief refresher on meiosis and genetic recombination, the steps in the map construction procedure are described, with explanations of the computations involved. The emphasis throughout is on the practical application of the methods described; detailed mathematical formulae are avoided and exercises are included to help readers consolidate their understanding. A chapter on recognising and solving problems provides valuable guidance for dealing with real-life situations. An extensive chapter dedicated to the more complex situation of outbreeding species offers a unique insight into the approach required for many economically important and model species, both plants and animals"--Provided by publisher
    Pages: 156 p.
    ISBN: 9781107013216
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    QH447:213 available
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  • 2
    ISSN: 1432-2242
    Keywords: Solanum spegazzinii ; Globodera rostochi ensis ; Nematode resistance ; QTL ; RFLP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We report the identification and mapping of two quantitative trait loci (QTLs) of Solanum spegazzinii BGRC, accession 8218-15, involved in resistance to the potato cyst-nematode Globodera rostochiensis pathotype Ro1, by means of restriction fragment length polymorphisms (RFLPs). For this purpose we crossed a susceptible diploid S. tuberosum with the resistant S. spegazzinii, and tested the F1 population for resistance to the Ro1 pathotype. Since the F1 segregated for the resistance, the S. spegazzinii parent was concluded to be heterozygous at the nematode resistance loci. For the mapping of the resistance loci we made use of RFLP markers segregating for S. spegazzinii alleles in the F1. One hundred and seven RFLP markers were tested in combination with four different restriction enzymes; 29 of these displayed a heterozygous RFLP pattern within S. spegazzinii and were used for mapping. Analysis of variance (ANOVA) was applied to test the association of the RFLP patterns of these markers with nematode resistance. Two QTLs involved in disease resistance to Globodera rostochiensis pathotype Ro1 were identified and mapped to chromosomes 10 and 11 respectively.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2242
    Keywords: Potato cyst-nematode ; Quantitative trait loci RFLP ; Distorted segregation ; Solanum spegazzinii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A high level of resistance toGlobodera pallida pathotypes Pa2 and Pa3 exists inSolanum spegazzinii, a wild relative of potato (S. tuberosum ssp.tuberosum). Here we report the mapping of loci involved in quantitatively-inherited nematode resistance with the use of RFLPs. One major locus,Gpa, was mapped on chromosome 5 and two minor loci on chromosomes 4 and 7 ofS. spegazzinii. Additionally, the contribution of the susceptible parent to nematode resistance was determined. TheGpa locus was solely responsible for the high resistance level found in the segregating population. However, the RFLP marker closely linked to this resistance locus showed a distorted segregation, with a shortage of plants having the resistance linked allele. Our results indicate that a prediction of the genetic constitution of a quantitative trait based solely on phenotypic observations can lead to erroneous conclusions.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-2242
    Keywords: Molecular markers ; Sex differences in recombination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In order to map genes determining resistance to bacterial canker in tomato, backcrosses were made between a resistant and a susceptible Lycopersicon peruvianum accession. The linkage study with RFLP markers yielded a genetic map of L. Peruvianum. This map was compared to that derived from a L. esculentum x L. pennellii F2 population, based on 70 shared RFLP markers. The maps showed a good resemblance in both the order of markers and the length of the chromosomes, with the exception of just one relocated marker on chromosome 9. Because backcrosses were made with the F1, either as the pollen parent or as the pistil parent, linkage maps from male and female meioses could be estimated. It was concluded that recombination at male meiosis was reduced, and that gametophytic selection for parental genotypes at more than one locus per chromosome might be partly responsible for the reduction of the estimated male map length.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2242
    Keywords: Clavibacter michiganensis ; Linkagestudy ; Quantitative trait loci ; Ordinal scale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A backcross population of the L. peruvianum accession LA 2157, which is resistant to bacterial canker caused by Clavibacter michiganensis ssp. michiganensis, with the susceptible L. peruvianum accession LA 2172 was evaluated for the segregation of C. michiganenis resistance and of RFLP markers in order to map the loci involved in this resistance. The development of symptoms of the disease was scored using an ordinal scale. The mapping of the disease resistance was hampered by distorted segregation ratios of a large number of markers and unexpected quantitative inheritance of the resistance. By means of the Kruskal-Wallis rank-sum test, five regions on chromosomes 1, 6, 7, 8 and 10 were identified that may be involved in C. michiganensis resistance.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-2242
    Keywords: Arabidopsis thaliana ; Flowering time ; Genotype-by-environment interaction ; Mapping ; Quantitative trait loci
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The interval mapping method is widely used for the genetic mapping of quantitative trait loci (QTLs), though true resolution of quantitative variation into QTLs is hampered with this method. Separation of QTLs is troublesome, because single-QTL is models are fitted. Further, genotype-by-environment interaction, which is of great importance in many quantitative traits, can only be approached by separately analyzing the data collected in multiple environments. Here, we demonstrate for the first time a novel analytic approach (MQM mapping) that accommodates both the mapping of multiple QTLs and genotype-by-environment interaction. MQM mapping is compared to interval mapping in the mapping of QTLs for flowering time in Arabidopsis thaliana under various photoperiod and vernalization conditions.
    Type of Medium: Electronic Resource
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