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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 94 (1997), S. 303-308 
    ISSN: 1432-2242
    Keywords: Key words Potato genetics ; Tetraploid-diploid hybrids ; 2n gametes ; Heterosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Two diploid potato parents, W5295.7 and W5337.3, and their colchicine-doubled tetraploids were used as male to cross with three cultivars: ‘Raritan’, ‘Shepody’ and ‘Superior’. Both diploids produced 2n gametes via first division restitution (FDR) during meiosis. Field experiments were carried out on seedlings of the 12 hybrid progenies in 1991 and 1992. Six of the progenies represented the tetraploid-diploid (4x-2x) hybrids and the other six tetraploid-tetraploid (4x-4x) progenies. The genetic consequence of FDR gametes was examined by comparing the mean and genotypic variance of six tuber traits of 4x-2x and 4x-4x progenies. Tuber appearance, eye depth, specific gravity and tuber size showed significant differences between the means of 4x-2x and 4x-4x progenies from either both or one of the diploid parents. The genotypic variances of these traits in 4x-2x progenies were reduced in various degrees from those observed in 4x-4x progenies. Major genes responsible for the inheritance of these traits are probably located close to the centromere. The two diploid parents may also carry alleles of different size and direction of non-additive genic effects in their 2n gametes. The 4x-2x progenies also outperformed the 4x-4x progenies with respect to the means of total and marketable yield. There were thus heterotic gene loci for high yield located close to the centromere. No marked reduction of genotypic variance, however, was observed. The results suggest that genes for yield would be scattered between the centromere and the site for maximum recombination.
    Type of Medium: Electronic Resource
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  • 2
    facet.materialart.
    Unknown
    In:  Nederlandse Faunistische Mededelingen (0169-2453) vol.39 (2013) p.43
    Publication Date: 2015-12-09
    Description: Craneflies of the family Tipulidae are a well-known group of the Diptera, consisting of large, long-legged nematocerous flies. Many species are more or less uniform yellow, grey or brown, but some are bright red or yellow and black. The wings can have extensive dark patterns. The subgenus Pterelachisus of the genus Tipula holds nine species in the Netherlands and in this paper species number 10 is introduced: T. (P.) trifascingulata. It is a rather conspicuous insect with a very characteristic wing pattern. It was only known from 25 records worldwide. In 2012, the year of discovery in the Netherlands, the species was found no less than nine times, in different parts of the country. This is an indication that the species has recently reached the Netherlands and is expanding its range.
    Keywords: Diptera ; Tipulidae ; Tipula trifascingulata ; distribution ; recognition ; Netherlands
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
    Format: application/pdf
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