ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Linkage analysis in tetraploid potato and association of markers with quantitative resistance to late blight (Phytophthora infestans) (1998)
    Springer
    Molecular genetics and genomics 259 (1998), S. 150-160 
    Details
    ISSN: 1617-4623
    Keywords: Key words AFLP ; Linkage map ; Solanum tuberosum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have constructed a partial linkage map in tetraploid potato which integrates simplex, duplex and double-simplex AFLP markers. The map consists of 231 maternal and 106 paternal markers with total map lengths of 990.9 cM and 484.6 cM. The longer of the two cumulative map lengths represents approximately 25% coverage of the genome. In tetraploids, much of the polymorphism between parental clones is masked by `dosage' which significantly reduces the number of individual markers that can be scored in a population. Consequently, the major advantage of using AFLPs – their high multiplex ratio – is reduced to the point where the use of alternative multi-allelic marker types would be significantly more efficient. The segregation data and map information have been used in a QTL analysis of late blight resistance, and a multi-allelic locus at the proximal end of chromosome VIII has been identified which contributes significantly to the expression of resistance. No late blight resistance genes or QTLs have previously been mapped to this location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380050800
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Isolation, characterisation and mapping of simple sequence repeat loci in potato (1998)
    Springer
    Molecular genetics and genomics 259 (1998), S. 233-245 
    Details
    ISSN: 1617-4623
    Keywords: Key words Simple sequence repeat ; Linkage map ; Single-strand hybridisation ; Triplex affinity capture ; Enriched library
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Solanum tuberosum L. DNA sequences containing simple sequence repeat (SSR) motifs were extracted from the EMBL database, cDNA and selectively enriched small-insert DNA libraries. Enrichment was achieved using either triplex affinity capture or single-strand hybridisation selection. One hundred and twelve primer pairs which successfully amplified products of the correct size from potato DNA were ultimately designed and synthesised. Ninety-eight of these revealed length polymorphisms in a panel of four diploid and two tetraploid clones, in agreement with the high information content of this class of markers which has been found in other species. All of the markers were assigned a quality score of 1–5 based on their potential usefulness. Eighty-nine loci from 65 of the primer pairs were located on two genetic linkage maps of potato by segregation analysis of the amplified alleles. Fifty-two of the SSRs were clearly single locus. The maps were aligned using 23 SSR primer pairs and 13 RFLP loci mapped in both populations. The markers described constitute a class which should replace Restriction Fragment Length Polymorphisms (RFLP) as the markers of choice for future genetic studies in potato. The sequences of the primers, together with other information on these markers are provided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380050809
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Identification of AFLP and SSR markers associated with quantitative resistance to Globodera pallida (Stone) in tetraploid potato (Solanum tuberosum subsp. tuberosum) with a view to marker-assisted selection (1998)
    Springer
    Theoretical and applied genetics 97 (1998), S. 202-210 
    Details
    ISSN: 1432-2242
    Keywords: Key words Potato ; Solanum tuberosum ; Nematode resistance ; Globodera pallida ; Linkage in autotetraploids ; Quantitative trait locus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Seventy eight clones from the cross between SCRI clone 12601ab1 and cv Stirling were used to explore the possibility of genetical linkage analysis in tetraploid potato (Solanum tuberosum subsp. tuberosum). Clone 12601ab1 had quantitative resistance to Globodera pallida Pa2/3 derived from S. tuberosum subsp. andigena. The strategy adopted involved identifying single- (simplex) and double- (duplex) dose AFLP markers in the parents from segregation ratios that could be unambiguously identified in their offspring, detecting linkage between a marker and a putative quantitative trait locus (QTL) for resistance, and placing the QTL on the linkage map of markers. The numbers of scorable segregating markers were 162 simplex ones present only in 12601ab1, 87 present in Stirling, and 32 present in both; and 72 duplex markers present only in 12601ab1 and 45 present in Stirling. The total map length was 990.9 cM in 12601ab1 and 484.6 cM in Stirling. A QTL with a resistance allele present in double dose (QQqq) in 12601ab1 was inferred from the associations between resistance scores (square root of female counts) and two duplex markers linked in coupling, which, in turn, were linked in coupling to four simplex markers also associated with resistance, but to a lesser degree. The largest marker class difference was the one for the duplex marker P61M34=15. It accounted for 27.8% of the phenotypic variance in resistance scores, or approximately 30% of the genotypic variance. Subsequently, this duplex marker was found to be linked in coupling with a duplex SSR allele Stm3016=a, whose locus was shown to be on chromosome IV in a diploid reference mapping population. The other QTLs for resistance segregating in the progeny were not identified for one or more of the following reasons: the markers did not cover the whole of the genome, there were unfavourable repulsion linkages between the QTLs and markers, or the gene effects were not large enough to be detected in an experiment of the size conducted. It is concluded that prospects appear good for detecting QTLs and using marker-assisted selection in a tetraploid potato breeding programme, provided that, in future, the population size is increased to over 250 and more SSR markers are used to complement the AFLPs; the same is likely to be true for other autotetraploid crops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050886
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Predicting parental genotypes and gene segregation for tetrasomic inheritance (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 1067-1073 
    Details
    ISSN: 1432-2242
    Keywords: Key words Autotetraploid ; Potato ; Codominant marker ; Genotype prediction ; Mapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Recent genome mapping projects in tetraploid plant species require a method for analysing the segregation patterns of molecular marker loci in these species. The present study presents a theoretical model and a statistical analysis for predicting the genotypes of a pair of tetraploid parents at a codominant (for example, RFLPs, microsatellites) or dominant (for example, AFLPs, RAPDs) molecular marker locus based on their and their progeny’s phenotypes scored at that locus (gel-band patterns). The theory allows for null alleles and for any degree of double-reduction to be modelled. A simulation study was performed to investigate the properties of the theoretical model. This showed that in many circumstances both the parental genotypes can be correctly identified with a probability of nearly 1, even when the molecular data were complicated by null alleles or double-reduction. Configurations where the parental genotype cannot be identified are discussed. The power to detect double-reduction varies considerably, depending on the proportion of identical alleles carried and shared by the parents, and the number of null alleles. Incorrect deductions of the occurrence of double-reduction were rare. The method was applied to data on a microsatellite locus segregating in the parents and 74 offspring of a tetraploid potato cross. Twentyfour parental configurations were consistent with the parental gel pattern, but only one of these was compatible with all the phenotypic data on the offspring. The feasibility for extending the present model to predict segregation of several linked loci, and particularly the linkage phase, is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051388
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    QTL for field resistance to late blight in potato are strongly correlated with maturity and vigour (1999)
    Springer
    Molecular breeding 5 (1999), S. 387-398 
    Details
    ISSN: 1572-9788
    Keywords: potato ; late blight ; QTL ; Linkage mapping ; earliness ; vigour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Field resistance to Phytophthora infestans, the causal agent of foliage and tuber blight in cultivated potatoes, earliness (maturity) and vigour, were examined in a diploid segregating potato population grown in replicated trials over three consecutive growing seasons. A genetic linkage map of this population was constructed in parallel using PCR-based SSR, AFLP and CAPS markers. Analysis of the trait scores alongside the marker segregation data allowed the identification of regions of the genome which were significantly correlated with components of the respective characters. The most significant associations for all four traits were with marker alleles on potato linkage group V originating from the male (susceptible) parent. In the case of foliage resistance to late blight, the positions of the majority of the effects, which were located on eleven of the twelve potato linkage groups, have been detected in previous [16] and parallel studies [21]. The absence of Solanum demissum-derived R genes for hypersensitive response to late blight and the co-localisation of QTL for resistance, vigour and earliness suggest that developmental and/or physiological factors play a major role in determining the level of foliage resistance in this population. In contrast with previous findings, a negative correlation was found between foliage and tuber blight resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009601427062
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    facet.materialart.
    Unknown
    Construction of Reference Chromosome-Scale Pseudomolecules for Potato: Integrating the Potato Genome with Genetic and Physical Maps (2013)
    Genetics Society of America (GSA)
    Details
    Publication Date: 2013-11-09
    Description: The genome of potato, a major global food crop, was recently sequenced. The work presented here details the integration of the potato reference genome (DM) with a new sequence-tagged site marker–based linkage map and other physical and genetic maps of potato and the closely related species tomato. Primary anchoring of the DM genome assembly was accomplished by the use of a diploid segregating population, which was genotyped with several types of molecular genetic markers to construct a new ~936 cM linkage map comprising 2469 marker loci. In silico anchoring approaches used genetic and physical maps from the diploid potato genotype RH89-039-16 (RH) and tomato. This combined approach has allowed 951 superscaffolds to be ordered into pseudomolecules corresponding to the 12 potato chromosomes. These pseudomolecules represent 674 Mb (~93%) of the 723 Mb genome assembly and 37,482 (~96%) of the 39,031 predicted genes. The superscaffold order and orientation within the pseudomolecules are closely collinear with independently constructed high density linkage maps. Comparisons between marker distribution and physical location reveal regions of greater and lesser recombination, as well as regions exhibiting significant segregation distortion. The work presented here has led to a greatly improved ordering of the potato reference genome superscaffolds into chromosomal "pseudomolecules".
    Electronic ISSN: 2160-1836
    Topics: Biology
    Published by Genetics Society of America (GSA)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...