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  • 1
    Electronic Resource
    Electronic Resource
    Turnip (Brassica rapa L. ssp. rapifera Metzg.) population improvement and cultivar production (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: In 1977, a fodder turnip breeding programme was started from seven cultivars with the primary aim of increasing dry-matter yield. The breeding method chosen was population improvement by half-sib family selection on a biennial cycle. Seed production in polythene tunnels with blowflies as pollinators was followed by assessing the resulting progenies in replicated yield trials and observation plots from which plants were selected for the next cycle. Six generations of selection resulted in a population with a yield that was 25% higher than the mean of the initial seven cultivars. This was remarkably close to the predicted superiority of the population, despite a significant discrepancy in one generation. It is concluded that the greatest response to selection per year would be achieved by selecting eight families from 128 assessed for 1 year in trials at two or three sites with an overall total of six replicates, given a resource limit of 800 plots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2002.737334.x
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  • 2
    Electronic Resource
    Electronic Resource
    A method for isolating and characterizing homozygous S-allele lines in Brassicae (1995)
    Springer
    Theoretical and applied genetics 91 (1995), S. 1107-1110 
    Details
    ISSN: 1432-2242
    Keywords: Self-incompatibility ; Brassicae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A method for isolating and characterizing homozygous S-allele lines of brassicas is described. The tester plants used are produced by crossing the parent plants with a recessive S-allele homozygote. The full method uses reciprocal crosses to identify and characterize the lines immediately. When flowering is prolonged and enables further tests to be carried out, a more efficient method that only uses single crosses initially can be used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223927
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  • 3
    Electronic Resource
    Electronic Resource
    Variation in flowering response to pre-vernalisation growth in swedes (Brassica napus ssp. rapifera) (1988)
    Springer
    Euphytica 37 (1988), S. 275-278 
    Details
    ISSN: 1573-5060
    Keywords: Brassica napus ; swedes ; vernalisation ; flowering time
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of pre-vernalisation growth (pre-growth) period on time of flowering was examined in four lines of swedes. No effect was found with the line from cv. Marian. The lines from cvs. Ruta Øtofte and Bangholm Wilby showed increases in time to flowering with increased pre-growth period; maximum delay occurred with 4 wk and 6 wk pre-growth, respectively. Most plants from a line of cv. Criffel showed no effects, but a small proportion did show long delays with pre-growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00015123
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  • 4
    Electronic Resource
    Electronic Resource
    Selection for high dry matter content in swedes (Brassica napus spp. rapifera) (1988)
    Springer
    Euphytica 39 (1988), S. 133-136 
    Details
    ISSN: 1573-5060
    Keywords: Brassica napus ; swedes ; inbreeding ; selection ; dry matter content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A programme of inbreeding and selection was carried out to increase the dry matter content of swedes. A combination of family and individual selection was used, based on deviations from the regression of dry matter content on fresh weight yield. The final selections, from a line of cv. Bangholm Wilby, had a dry matter content of 20 per cent higher than the control cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00039865
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  • 5
    Electronic Resource
    Electronic Resource
    Self-incompatibility interactions in Brassica napus (1989)
    Springer
    Euphytica 42 (1989), S. 99-103 
    Details
    ISSN: 1573-5060
    Keywords: Brassica napus ; self-incompatibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The interactions of nine S-gene lines of Brassica napus were examined. Seven different S-genes were involved in the crosses, with three lines of different origin having the same S-gene. In general, the reactions on selfing the heterozygotes were as expected from the results of test crosses with the homozygous parent lines. All types of dominance relationships were found, including reversal of dominance in pollen and pistil. Weakening of activity of one or both genes was found in several cases. Background genotype was found have to some effect and reciprocal differences in reactions were also observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042620
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  • 6
    Electronic Resource
    Electronic Resource
    Methods of producing F1 hybrid swedes (Brassica napus ssp. rapifera) (1975)
    Springer
    Euphytica 24 (1975), S. 537-541 
    Details
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The methods by which F1 hybrid swedes can be produced are discussed. The use of self-incompatibility is considered preferable to the use of cytoplasmic male sterility. Several ways of utilising self-incompatibility are available and the integration of self-compatible lines into these methos should simplify their use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028228
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  • 7
    Electronic Resource
    Electronic Resource
    The production of F1 hybrid swedes (Brassica napus ssp. Rapifera) by the utilisation of self-incompatability (1974)
    Springer
    Euphytica 23 (1974), S. 205-208 
    Details
    ISSN: 1573-5060
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Six inbred lines from a swede with naturally occurring self-incompatibility were each isolated with a swede cultivar containing marker genes. The percentage of intervarietal hybrids produced by the self-incompatible lines was between 97.4% and 99.6%, whereas in the self-compatible marker cultivar it varied between 7.2% and 26.8%. The F1 hybrids showed increases in dry matter yield of 11.5% to 28.8% over the higher parent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035859
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  • 8
    Electronic Resource
    Electronic Resource
    A comparison of methods for hybrid seed production using self-incompatibility in swedes (Brassica napus ssp. napobrassica) (2000)
    Springer
    Euphytica 113 (2000), S. 207-210 
    Details
    ISSN: 1573-5060
    Keywords: Brassica napus ; hybrid seed production ; self-incompatibility ; swedes, rutabaga
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Procedures for producing seed of hybrid swedes using self-incompatibility were examined. Single-cross, double-cross and modified double-cross hybrids were compared in isolation plots using natural pollinators and in polythene tunnels using blow-flies. With good coincidence of flowering and the same flower colour, nearly 100% hybrid seed was produced by natural pollinators with the single-crosses, the double-cross and one of the two modified double-cross hybrids; the other modified double-cross hybrid produced 87%hybrid seed. With poor coincidence of flowering and different flower colours the proportion of hybrids dropped to 61%. Using different flower colours and blow-flies as pollinators in polythene tunnels, higher levels of outcrossing were produced than in isolation plots with natural pollinators; the opposite result was obtained when the same flower colour was used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003941606357
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  • 9
    Electronic Resource
    Electronic Resource
    A comparison of diploid and tetraploid turnips (Brassica campestris SSP. Rapifera) (1977)
    Springer
    Euphytica 26 (1977), S. 203-206 
    Details
    ISSN: 1573-5060
    Keywords: Brassica campestris ssp ; rapifera ; turnip ; diploid ; tetraploid ; diallel crosses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Five lines of tetraploid turnips and their diploid progenitors were examined. Diallel crosses were made at each level of ploidy and trial results showed that in all cases the diploids outyielded their respective tetraploids for dry matter production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032085
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  • 10
    Electronic Resource
    Electronic Resource
    The transfer of characters from Brassica campestris L. to Brassica napus L.: Production of clubroot-resistant oil-seed rape (B. napus ssp oleifera) (1982)
    Springer
    Euphytica 31 (1982), S. 971-976 
    Details
    ISSN: 1573-5060
    Keywords: Brassica napus ; oil-seed rape ; Brassica campestris ; turnip ; Plasmodiophora ; clubroot ; interspecific crossing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Four oil-seed rape lines were crossed with a clubroot resistant Brassica campestris line from the European Clubroot Differential sct. The allotriploid hybrids were backcrossed to the rape lines to introgress clubroot resistance into oil-seed rape. Using a combination of screening for disease resistance and chromosome number, a high proportion of 38-chromosome, clubroot resistant selections were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00039237
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