Search Results - (Author, Cooperation:D. F. Marshall)
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1Latest Papers from Table of Contents or Articles in PressX. Xu ; S. Pan ; S. Cheng ; B. Zhang ; D. Mu ; P. Ni ; G. Zhang ; S. Yang ; R. Li ; J. Wang ; G. Orjeda ; F. Guzman ; M. Torres ; R. Lozano ; O. Ponce ; D. Martinez ; G. De la Cruz ; S. K. Chakrabarti ; V. U. Patil ; K. G. Skryabin ; B. B. Kuznetsov ; N. V. Ravin ; T. V. Kolganova ; A. V. Beletsky ; A. V. Mardanov ; A. Di Genova ; D. M. Bolser ; D. M. Martin ; G. Li ; Y. Yang ; H. Kuang ; Q. Hu ; X. Xiong ; G. J. Bishop ; B. Sagredo ; N. Mejia ; W. Zagorski ; R. Gromadka ; J. Gawor ; P. Szczesny ; S. Huang ; Z. Zhang ; C. Liang ; J. He ; Y. Li ; Y. He ; J. Xu ; Y. Zhang ; B. Xie ; Y. Du ; D. Qu ; M. Bonierbale ; M. Ghislain ; R. Herrera Mdel ; G. Giuliano ; M. Pietrella ; G. Perrotta ; P. Facella ; K. O'Brien ; S. E. Feingold ; L. E. Barreiro ; G. A. Massa ; L. Diambra ; B. R. Whitty ; B. Vaillancourt ; H. Lin ; A. N. Massa ; M. Geoffroy ; S. Lundback ; D. DellaPenna ; C. R. Buell ; S. K. Sharma ; D. F. Marshall ; R. Waugh ; G. J. Bryan ; M. Destefanis ; I. Nagy ; D. Milbourne ; S. J. Thomson ; M. Fiers ; J. M. Jacobs ; K. L. Nielsen ; M. Sonderkaer ; M. Iovene ; G. A. Torres ; J. Jiang ; R. E. Veilleux ; C. W. Bachem ; J. de Boer ; T. Borm ; B. Kloosterman ; H. van Eck ; E. Datema ; B. Hekkert ; A. Goverse ; R. C. van Ham ; R. G. Visser
Nature Publishing Group (NPG)
Published 2011Staff ViewPublication Date: 2011-07-12Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Evolution, Molecular ; Gene Duplication ; Gene Expression Regulation, Plant ; Genes, Plant/genetics ; Genetic Variation ; Genome, Plant/*genetics ; *Genomics ; Haplotypes/genetics ; Heterozygote ; Homozygote ; Immunity, Innate ; Inbreeding ; Molecular Sequence Annotation ; Molecular Sequence Data ; Plant Diseases/genetics ; Ploidies ; Solanum tuberosum/*genetics/physiologyPublished by: -
2Articles: DFG German National LicensesSebastian, R. L. ; Howell, E. C. ; King, G. J. ; Marshall, D. F. ; Kearsey, M. J.
Springer
Published 2000Staff ViewISSN: 1432-2242Keywords: Key words Brassica oleracea ; Integrated map ; Molecular markers ; Doubled-haploid ; Comparative mappingSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract Genetical maps of molecular markers in two very different F1-derived doubled-haploid populations of Brassica oleracea are compared and the first integrated map described. The F1 crosses were: Chinese kale×calabrese (var. alboglabra×var. italica) and cauliflower×Brussels sprout (var. botrytis×var. gemmifera). Integration of the two component maps using Joinmap v.2.0 was based on 105 common loci including RFLPs, AFLPs and microsatellites. This provided an effective method of producing a high-density consensus linkage map of the B. oleracea genome. Based on 547 markers mapping to nine linkage groups, the integrated map covers a total map length of 893 cM, with an average locus interval of 2.6 cM. Comparisons back to the component linkage maps revealed similar sequences of common markers, although significant differences in recombination frequency were observed between some pairs of homologous markers. Map integration resulted in an increased locus density and effective population size, providing a stronger framework for subsequent physical mapping and for precision mapping of QTLs using substitution lines.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesKearsey, M. J. ; Ramsay, L. D. ; Jennings, D. E. ; Lydiate, D. J. ; Bohuon, E. J. R. ; Marshall, D. F.
Springer
Published 1996Staff ViewISSN: 1432-2242Keywords: Brassica oleracea ; Mapping ; Meiosis ; Molecular markers ; Sex differences in recombinationSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract Linkage maps of the nine chromosomes of Brassica oleracea, based on 75 informative molecular markers, have been compared in first and second backcross progeny from a cross between two doubled haploid lines. The second backcross progeny showed greater recombination frequencies for 75% of the pairs of adjacent markers, but there was no obvious indication that this effect was localised to particular regions of the chromosomes. Four chromosomes increased in genetic length more than twofold, while overall, the total map was 66% longer. The possible causes of this discrepancy are analysed. A sex difference in chiasma distribution and/or frequency at meiosis is thought to be the most likely explanation. The implications of this finding for mapping and map-based applications are discussed.Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesKearsey, M. J. ; Ramsay, L. D. ; Jennings, D. E. ; Lydiate, D. J. ; Bohuon, E. J. R. ; Marshall, D. F.
Springer
Published 1996Staff ViewISSN: 1432-2242Keywords: Key words Brassica oleracea ; Mapping ; Meiosis ; Molecular markers ; Sex differences in recombinationSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstact Linkage maps of the nine chromosomes of Brassica oleracea, based on 75 informative molecular markers, have been compared in first and second backcross progeny from a cross between two doubled haploid lines. The second backcross progeny showed greater recombination frequencies for 75% of the pairs of adjacent markers, but there was no obvious indication that this effect was localised to particular regions of the chromosomes. Four chromosomes increased in genetic length more than twofold, while overall, the total map was 66% longer. The possible causes of this discrepancy are analysed. A sex difference in chiasma distribution and/or frequency at meiosis is thought to be the most likely explanation. The implications of this finding for mapping and map-based applications are discussed.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 1573-5060Keywords: genetic conservation ; minimum sample size ; self-fertilising and cross-fertilising speciesSource: Springer Online Journal Archives 1860-2000Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionNotes: Summary A sample of about 172 plants, drawn at random from a population of a target species, is of sufficient size to conserve at a very high probability, all or very nearly all of the polymorphic genes that are segregating in the population, provided that their frequency is not less than 0.05, irrespective of whether the individuals of the species set all of their seed by self-or by cross-fertilisation or a mixture of both. When samples are taken from a number of populations, the size of the sample drawn from each need be no larger than 172 divided by the number of populations visited. It is pointed out that implementation of this conclusion could lead to very considerable saving of resources in both the collection and storage of material in gene banks.Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 1573-5060Keywords: genetic conservation ; evaluation ; natural progenies ; sample size ; cross-fertilisersSource: Springer Online Journal Archives 1860-2000Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, NutritionNotes: Summary Provided that the seed collected from each plant in natural populations of a species is kept separate from that of every other, a rough estimate of the heritability of a quantitative character can be obtained from the natural progenies raised from this seed in a randomised evaluation trial; a knowledge of the reproductive biology of the species can help to make this estimate of the heritability of the character more precise. The theory employed in this evaluation procedure can be used to investigate the possibility of reducing the number of plants visited in a population, when species set all of their seed by cross-fertilisation, by taking several seeds from each. We show that it is not worth taking more than eight seeds from each plant and that, in the absence of precise information about the paternity of this seed, it might be better to follow the general recommendation of Lawrence et al. (1995), by taking only one seed from each of the 172 plants. Having investigated the minimum sample size for genetic conservation in the narrow sense, we broaden discussion to consider sample size for evaluation and regeneration. It is pointed out that it is not necessary to take more than about ten seeds from each of 20–30 randomly chosen plants in each population visited and that it is possible to reduce this number of plants if material from a number of populations is evaluated in a single trial. Finally, we draw attention to the possibility of regenerating seed from a composite population founded by raising one plant from the seed taken from each plant of the original collection, as an alternative to regenerating the seed of each accession independently from that of every other.Type of Medium: Electronic ResourceURL: