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  • 1
    Electronic Resource
    Electronic Resource
    Adaptation and stability analysis of sweet potato varieties for low-input systems in Uganda (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Plant breeding 124 (2005), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Sixteen sweet potato varieties were evaluated for fresh storage root yield in 20 trials during 2000–2001 for three seasons in four locations in Uganda. Of the 16 varieties, 11 were developed by farmers and five by a central breeding programme. The behaviour of the varieties was quantified in terms of wide adaptation (genotypic mean across trials), specific adaptation (genotypic predictions for specific locations) and stability (Shukla stability variance). With respect to all three aspects of yield behaviour, farmer varieties performed on average better than the official varieties. The results illustrate the potential that farmer varieties can have in the improvement of sweet potato in Uganda and other regions where high diversity of sweet potato landraces exists.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.2005.01149.x
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  • 2
    Electronic Resource
    Electronic Resource
    Use of component analysis in QTL mapping of complex crop traits: a case study on yield in barley (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 121 (2002), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Genes contributing to the quantitative variation of a complex crop trait can be numerous. However, using existing approaches, the number of quantitative trait loci (QTL) detected for a trait is limited. Therefore, rather than looking for QTL for a complex trait itself, determining QTL for underlying component traits might give more information. In this study the potential of component analysis in QTL mapping of complex traits was examined using grain yield in spring barley as an example. Grain yield was divided into three components: number of spikes/m2, number of kernels/spike, and 1000-kernel weight. These traits were measured for individuals of a recombinant inbred-line population in field trials conducted over 2 years. By the use of an approximate multiple QTL model, one to eight QTL were detected for each trait in a year. Some QTL were mapped to similar positions in both years. Almost all QTL for yield were found at the position of or in close proximity to QTL for its component traits. A number of QTL for component traits were not detected when yield itself was subjected to QTL analysis. However, relative to the QTL for yield itself, all component-trait QTL did not explain the variation in yield better. The results in relation to the potential of using component analysis in studying complex crop traits are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2002.729117.x
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  • 3
    Electronic Resource
    Electronic Resource
    Interpretation of UV-survival curves of Aspergillus conidiospores
    Amsterdam : Elsevier
    Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 197 (1988), S. 67-75 
    Details
    ISSN: 0027-5107
    Keywords: (Aspergillus nidulans) ; Extrapolation number ; Repair capacity ; Survival curves ; Target number
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0027-5107(88)90141-8
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  • 4
    Electronic Resource
    Electronic Resource
    Clonal analysis of radiation-induced translocations in stem-cell spermatogonia of normal and T70H translocation heterozygous mice
    Amsterdam : Elsevier
    Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 83 (1981), S. 207-219 
    Details
    ISSN: 0027-5107
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0027-5107(81)90006-3
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  • 5
    Electronic Resource
    Electronic Resource
    Estimators for viability in experimental populations, their variances and covariances
    Amsterdam : Elsevier
    Theoretical Population Biology 2 (1971), S. 51-59 
    Details
    ISSN: 0040-5809
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0040-5809(71)90004-9
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  • 6
    Electronic Resource
    Electronic Resource
    The role of predators and parasites in controlling populations ofEarias insulana, heliothis armigera andBemisia tabaci on cotton in the Syrian Arab Republic (1990)
    Springer
    BioControl 35 (1990), S. 315-327 
    Details
    ISSN: 1573-8248
    Keywords: Population dynamics ; integrated pest management ; cotton pests ; predators ; parasites ; Syria ; biocontrol ; dynamique des populations ; lutte intégrée ; ravageurs du coton ; prédateurs ; parasites ; Syrie ; lutte biologique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Des études sur les relations entre les insectes ravageurs et leurs prédateurs et parasites ont été poursuivies de 1980 à 1983 dans les plantations de coton en Syrie.Earias insulana était le ravageur le plus nuisible, tandis qu'Heliothis armigera n'était pas un problème revenant chaque année. Parmi les insectes entomophages rencontrés les Coccinellides sont les plus nombreux au cours des mois de juin et de juillet, tandis que les Hémiptères sont plus abondants durant août et septembre. Quand le nombre de prédateurs était réduit par des applications insecticides, il en résultait une augmentation significative des populations d'Earias, avec comme résultat des réductions significatives de la production de graines de coton. Les parasites furent relativement pas importants dans la limitation des Lépidoptères nuisibles sur coton. Les œufs et les populations larvaires d'E. insulana etH. armigera furent parasités parTrichogramma spp. etHabrobracon brevicornis Wesmael respectivement. Les populations deBemisia tabaci (Gennadius) furent fortement parasitées parErtmocerus mundus Mercet.
    Notes: Abstract Studies on the relationship between insect pests and their predators and parasites were conducted in the Syrian cotton agro-ecosystem from 1980 up to 1983.Earias insulana (Boisduval) was found to be the most damaging pest, whileHeliothis armigera (Hübner) was not an annual returning problem. Among the entomophagous insects found, coccinellids were most numerous during the months June and July and the hemipterous predators were more abundant during August and September. When predator numbers were reduced with insecticide applications, a significant increase in the bollworm populations occurred, resulting in significant reductions in seed cotton yields. Parasites were relatively not important for the control of lepidopterous pests on cotton. Egg and larva populations ofE. insulana andH. armigera were parasitized byTrichogramma spp. andHabrobracon brevicornis Wesmael respectively. Populations ofBemisia tabaci (Gennadius) were heavily parasitized byEretmocerus mundus Mercet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375255
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  • 7
    Electronic Resource
    Electronic Resource
    Identification of QTLs for partial resistance to leaf rust (Puccinia hordei) in barley (1998)
    Springer
    Theoretical and applied genetics 96 (1998), S. 1205-1215 
    Details
    ISSN: 1432-2242
    Keywords: Key words Partial resistance ; Leaf rust ; Barley ; QTL mapping ; Puccinia hordei ; Hordeum vulgare ; Latent period
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The partial resistance to leaf rust in barley is a quantitative resistance that is not based on hypersensitivity. To map the quantitative trait loci (QTLs) for partial resistance to leaf rust, we obtained 103 recombinant inbred lines (RILs) by single-seed descent from a cross between the susceptible parent L94 and the partially resistant parent Vada. These RILs were evaluated at the seedling and adult plant stages in the greenhouse for the latent period (LP) of the rust fungus, and in the field for the level of infection, measured as area under the disease progress curve (AUDPC). A dense genetic map based on 561 AFLP markers had been generated previously for this set of RILs. QTLs for partial resistance to leaf rust were mapped using the “Multiple Interval Mapping” method with the putative QTL markers as cofactors. Six QTLs for partial resistance were identified in this population. Three QTLs, Rphq1, Rphq2 and Rphq3, were effective at the seedling stage and contributed approximately 55% to the phenotypic variance. Five QTLs, Rph2, Rphq3, Rphq4, Rphq5, and/or Rphq6 contributed approximtely. 60% of the phenotypic variance and were effective at the adult plant stage. Therefore, only the QTLs Rphq2 and Rhpq3 were not plant-stage dependent. The identified QTLs showed mainly additive effects and only one significant interaction was detected, i.e. between Rphq1 and Rphq2. The map positions of these QTLs did not coincide with those of the race-specific resistance genes, suggesting that genes for partial resistance and genes for hypersensitive resistance represent entirely different gene families. Also, three QTLs for days to heading, of which two were also involved in plant height, were identified in the present recombinant inbred population. These QTLs had been mapped previously on the same positions in different populations. The perspectives of these results for breeding for durable resistance to leaf rust are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050858
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  • 8
    Electronic Resource
    Electronic Resource
    Two high-density AFLP® linkage maps of Zea mays L.: analysis of distribution of AFLP markers (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 921-935 
    Details
    ISSN: 1432-2242
    Keywords: Key words Zea mays L. ; AFLP® ; Methylation AFLP® ; Genetic map ; DNA methylation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  This study demonstrates the relative ease of generating high-density linkage maps using the AFLP® technology. Two high-density AFLP linkage maps of Zea mays L. were generated based on: (1) a B73 × Mo17 recombinant inbred population and (2) a D32 × D145 immortalized F2 population. Although AFLP technology is in essence a mono-allelic marker system, markers can be scored quantitatively and used to deduce zygosity. AFLP markers were generated using the enzyme combinations EcoRI/MseI and PstI/MseI. A total of 1539 and 1355 AFLP markers have been mapped in the two populations, respectively. Among the mapped PstI/MseIAFLP markers we have included fragments bounded by a methylated PstI site (mAFLP markers). Mapping these mAFLP markers shows that the presence of C-methylation segregates in perfect accordance with the primary target sequence, leading to Mendelian inheritance. Simultaneous mapping of PstI/MseIAFLP and PstI/MseI mAFLP markers allowed us to identify a number of epi-alleles, showing allelic variation in the CpNpG methylation only. However, their frequency in maize is low. Map comparison shows that, despite some rearrangements, most of the AFLP markers that are common in both populations, map at similar positions. This would indicate that AFLP markers are predominantly single-locus markers. Changes in map order occur mainly in marker-dense regions. These marker-dense regions, representing clusters of mainly EcoRI/MseI AFLP and PstI/MseI mAFLP markers, co- localize well with the putative centromeric regions of the maize chromosomes. In contrast, PstI/MseImarkers are more uniformly distributed over the genome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051399
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  • 9
    Electronic Resource
    Electronic Resource
    Autotetraploids and genetic mapping using common AFLP markers: the R2 allele conferring resistance to Phytophthora infestans mapped on potato chromosome 4 (1998)
    Springer
    Theoretical and applied genetics 96 (1998), S. 1121-1128 
    Details
    ISSN: 1432-2242
    Keywords: Key words Tetrasomic inheritance ; Solanum tuberosum ; AFLP ; Bulked segregant analysis ; R2 resistance gene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Due to the complexity of tetrasomic inheritance, mapping studies in potato (Solanum tuberosum L.) are generally conducted at the diploid level. In the present study we tested the feasibility of Bulked Segregant Analysis (BSA) using a tetraploid offspring for the identification of AFLP markers linked to the R2 allele, which confers race-specific resistance to Phytophthora infestans. Eleven bulk-specific AFLP markers, detected in fingerprints of 205 AFLP primer combinations, could be mapped in a linkage group encompassing the R2 locus. The efficiency of BSA at the tetraploid level, determined by the frequency of single-dose restriction fragments (SDRF), was much higher than expected on the basis of overall genetic dissimilarity between the parental clones. The fortuitous detection of AFLPs with linkage to the R2 allele is explained on the basis of specific genetic dissimilarity between cultivated potato and the chromosomal segment introgressed from S. demissum carrying the resistant R2 allele. AFLP markers common to those with linkage to R2 were visually recognized by their electrophoretic mobility in the AFLP fingerprint in a parental clone of a reference mapping population. Using these common AFLP markers we anchored the linkage group comprising the R2 allele to potato chromosome 4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050847
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  • 10
    Electronic Resource
    Electronic Resource
    AFLP mapping of quantitative trait loci for yield-determining physiological characters in spring barley (1999)
    Springer
    Theoretical and applied genetics 99 (1999), S. 244-253 
    Details
    ISSN: 1432-2242
    Keywords: Key words Hordeum vulgare ; Amplified fragment length polymorphism (AFLP) ; Quantitative trait loci (QTLs) ; Yield ; Physiological traits ; Crop-growth model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  An amplified fragment length polymorphism (AFLP) map covering 965 cM was constructed using 94 recombinant inbred lines of a cross between the spring barley varieties Prisma and Apex. This map was employed to identify quantitative trait loci (QTLs) controlling plant height, yield and yield-determining physiological characters using an approximate multiple-QTL model, the MQM method. The seven physiological traits were parameters used in a process-based crop-growth model that predicts barley biomass production as affected by daily temperature and radiation. The traits were measured in experiments conducted over 2 years. Except for the relative growth rate of leaf area, all traits examined had at least one QTL in each year. QTLs and their effects were found to vary with developmental stages for one trait, the fraction of shoot biomass partitioned to leaves, that was measured at several stages. Most of the traits were associated, though to different extents, with the denso dwarfing gene (the height-reducing allele in Prisma) located on the long arm of chromosome 3. Some of the QTLs were mapped to similar positions in both years. The results in relation to effects of the dwarfing gene, the physiological basis for QTL×environment interaction, and the relative importance of the parameter traits with respect to yield, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051230
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