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  • 1
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    Interspecific relationship and genetic diversity in wild beets in section Corollinae genus Beta: Isozyme and RAPD analyses (1996)
    Springer
    Details
    Publication Date: 1996-06-01
    Print ISSN: 0925-9864
    Electronic ISSN: 1573-5109
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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  • 2
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    Genotypic frequencies at equilibrium for a multilocus gametophytic incompatibility system (1982)
    Springer Nature
    Details
    Publication Date: 1982-06-01
    Print ISSN: 0018-067X
    Electronic ISSN: 1365-2540
    Topics: Biology
    Published by Springer Nature
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  • 3
    Electronic Resource
    Electronic Resource
    Clustering of amplified fragment length polymorphism markers in a linkage map of rye (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: Amplified fragment length polymorphisms (AFLPs) are now widely used in DNA fingerprinting and genetic diversity studies, the construction of dense genetic maps and in fine mapping of agronomically important traits. The AFLP markers have been chosen as a source to extend and saturate a linkage map of rye, which has previously been generated by means of restriction fragment length polymorphism, random amplified polymorphic DNA, simple sequence repeat and isozyme markers. Gaps between linkage groups, which were known to be part of chromosome 2R, have been closed, thus allowing the determination of their correct order. Eighteen EcoRI-MseI primer combinations were screened for polymorphism and yielded 148 polymorphic bands out of a total of 1180. The level of polymorphism among the different primer combinations varied from 5.7% to 33.3%. Eight primer combinations, which revealed most polymorphisms, were further analysed in all individuals of the F2 mapping population. Seventy-one out of 80 polymorphic loci could be integrated into the linkage map, thereby increasing the total number of markers to 182. However, 46% of the mapped AFLP markers constituted four major clusters located on chromosomes 2R, 5R and 7R, predominantly in proximity to the centromere. The integration of AFLP markers caused an increase of 215 cM, which resulted in a total map length of almost 1100 cM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2002.00698.x
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  • 4
    Electronic Resource
    Electronic Resource
    Two major genes for kernel weight in rye (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: Previously, kernel weight in rye was considered mostly as a quantitatively inherited trait. F1 plants from parents showing a great difference in kernel weight were selfed and the segregating F2 population was analysed with molecular markers. Two simple sequence repeats markers, one on chromosome 5 and the other on chromosome 7, were found which allowed the genetic analysis of two major genes acting in a complementary way. The analysis of major genes is an advantage in breeding for this important economic trait. In addition it can provide more insight into the genetic structure of this character. This is, in turn, also a prerequisite for future investigations of this trait at the molecular level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2002.00666.x
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  • 5
    Electronic Resource
    Electronic Resource
    An Isozyme Marker for Pollen Fertility Restoration in the Pampa cms System of Rye (Secale cereale L.) (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 111 (1993), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Hybrid breeding in rye (Secale cereale L.) based on cytoplasmic male sterility requires a sufficient restoration of pollen fertility to guarantee full seed set in the hybrid variety. Therefore the selection of effective restorer lines is an important goal in the breeding process. An F2 generation tracing back to a cross of a nonrestorer line as seed parent and a restorer line, and subsequent three-way crosses between the corresponding F1 plants and a nonrestorer line were used to find marker genes for pollen fertility restoration. A linkage between the Prx.7 isozyme locus on chromosome 1R and a putative major gene (or gene complex) for pollen fertility restoration with a recombination value of about 20 % was found. To our knowledge, this is the first case of a marker gene for this trait in rye.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1993.tb00644.x
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  • 6
    Electronic Resource
    Electronic Resource
    An extended genetic map of rye (Secale cereale L.) (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 115 (1996), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A genetic linkage map of rye consisting of 92 markers was constructed by using isozyme and molecular marker techniques. For this purpose an F2 population of 137 individuals was established on which RFLP studies with homologous and heterologous probes were performed. After establishing a reliable polymerase chain reaction (PCR) protocol, 280 random primers were screened for polymorphisms and 17 random amplified polymorphic DNA (RAPD) loci were mapped. The digestion of the template DNA prior to PCR increased the degree of polymorphism. Previously published markers could also be integrated into this map by using the JoinMap computer program. The resulting linkage map comprises a total of 127 markers and spans a distance of about 760 cM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1996.tb00966.x
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  • 7
    Electronic Resource
    Electronic Resource
    Estimating Linkage Relationship of Isozyme Markers and Morphological Markers in Sugar Beet (Beta vulgaris L.) Including Families with Distorted Segregations (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 108 (1992), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The linkage relationship between eighteen isozyme loci and the morphological markers hypocotyl colour (R-r), monogerm character (M-m), pollen fertility (X) and stem fasciation (Verb.) are tested. Three linkage groups could be set up, involving all morphological marker loci and eight of the isozyme loci. Est-2, R-r, Fdp-2, Got2 and Icd-1 belong to linkage group I, linkage group II includes the loci Fas-fas M-m, Est-3 and Aco-1, linkage group III contains the loci X, Mdh-1 and Est-5.When analysing the inheritance of isozymes and RFLPs, deviations are usually found in some lines from the expected frequencies of a 3 : 1 or 1 : 2 : 1 segregation at single marker loci. In many cases these data can still be used for the estimation of recombination values with linked loci under the control of selection. Procedures to estimate linkage in such cases are given and applied to experimental data in Beta vulgaris.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1992.tb00106.x
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  • 8
    Electronic Resource
    Electronic Resource
    Occurrence of microsatellites in spinach sequences from computer databases and development of polymorphic SSR markers (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 117 (1998), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Microsatellites are valuable tools as molecular markers in plant breeding. To establish genetic linkage maps or for population studies, information about the occurrence and usability of microsatellite markers in different species is necessary. Sequences of spinach Spinacia oleracea from computer databases were therefore searched for the presence of microsatellites. Sixty simple sequence repeats were found in 237 spinach sequences with a total of 349.4 kb DNA. After removing duplicated sequences, 50 different microsatellites with various motifs remained. Differences between nuclear and chloroplast DNA were not in the number of microsatellites but in their type and length. Chloroplast sequences from spinach contain only short strings of A and AT repeats, whereas nuclear sequences show a wider variety of motifs.Flanking primers for polymerase chain reaction (PCR) analysis were designed for 13 of these microsatellites and tested with two different varieties of spinach. Twelve primer pairs gave amplification products and seven of these showed polymorphisms in the variety ‘Wiremona’ but only one in the variety ‘Monatol’. These markers may be used for linkage analysis or population studies in spinach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1998.tb01938.x
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  • 9
    Electronic Resource
    Electronic Resource
    Nematode Resistance Derived from Wild Beet and its Meiotic Stability in Sugar Beet (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 99 (1987), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Three different karyotypes of sugar beet with resistance against the beet cyst nematode (Heterodera schachtii) have been investigated. These comprised monosomic addition lines (2n = 19) with one complete chromosome from B. patellarris or B. procumbens, one line with a chromosomal fragment added to the normal sugar beet chromosome complement (2n =18 + fragment) and one diploid line (2n = 18). The fragment originated from a B. procumbens chromosome since during meiosis it formed a univalem. It carries the gene for nematode resistance. Meiotic disturbances like univalems. laggards, anaphase I bridges, fragments and micronuclei were observed in all resistant genotypes. These may result in an exclusion of the chromosome fragment carrying the resistance from the rest of the genome. In the diploid resistant line, a chromosome with a translocation could be distinguished from the other B. vulgaris chromosomes. Meiotic irregularities also appeared in diploid resistant types and are one main reason for low transmission of the resistance. Tin-relationship between meiotic stability and the transmission rate of the resistance gene is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1987.tb01150.x
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  • 10
    Electronic Resource
    Electronic Resource
    Selection of Diploid Nematode-Resistant Sugar Beet from Monosomic Addition Lines (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 98 (1987), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Monosomic sugar beet/wild beet addition lines (2n = 19) with full resistance against the beet cyst nematode have been characterized in different ways. Within the B. procumbens and B. webbiana addition lines three groups could be classified according to their isozymes pattern, growth habit, transmission rate, and resistance level. It is assumed that B. procumbens and B. webbiana each possess three different chromosomes which carry genes for nematode resistance. In the offspring of the addition lines diploid translocation types appear at very low frequencies, Isozyme pattern or growth type of the resistant plants were used for selecting diploid types in the offspring of monosomic addition lines. Effective selection could be made in progenies of susceptible sugar beets pollinated by addition lines because the pollen transmission of the alien chromosome is very low. Using these methods 7 nematode-resistant sugar beet lines could be selected. The transmission rates of the resistance gene ranged from 70.6% to 100%. Threw heterozygous progenies showed a 1:1 segregation indicating monogenic dominant inheritance of resistance. The level of resistance was as high as in the addition lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1987.tb01118.x
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