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  • Blackwell Publishing Ltd  (4)
  • American Institute of Physics (AIP)  (1)
  • 2000-2004  (5)
  • 1990-1994
  • 2000  (5)
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  • 2000-2004  (5)
  • 1990-1994
Year
  • 1
    Electronic Resource
    Electronic Resource
    In situ ion channeling study of gallium disorder and gold profiles in Au-implanted GaN (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7671-7678 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Disorder accumulation and annealing behavior on the Ga sublattice in gallium nitride (GaN) implanted with 1.0 MeV Au2+ (60° off surface normal) at 180 or 300 K have been studied using in situ Rutherford backscattering spectrometry in a 〈0001〉-channeling geometry. Complete amorphization in GaN is attained at 6.0 and 20 Au2+/nm2 for irradiation at 180 and 300 K, respectively. A saturation in the Ga disorder at and behind the damage peak was observed at intermediate ion fluences at both 180 and 300 K. No measurable thermal recovery was found at 300 K for the full range of damage produced at 180 K. However, distinct epitaxial regrowth in the bulk and Ga reordering at surface occurred after annealing at 870 K. The implanted Au readily diffuses into the highly damaged regions at elevated temperatures, and the redistribution of the Au atoms in the implanted GaN varies with the damage profiles. A double-peak Au profile developed with the maxima located in the amorphous surface region and near the Au mean projected range. The result is interpreted as Au atom diffusion into the amorphous regime near the surface and Au trapping at irradiation-induced defects in the crystal structure. This trapping effect is also evidenced in this study by the suppressed recovery of the Au-decorated disorder in GaN. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373439
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  • 2
    Electronic Resource
    Electronic Resource
    New sources of resistance for stripe rust in barley (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 119 (2000), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Eight spring barley accessions from the gene bank in Gatersleben, Germany, and 10 cultivars were tested for stripe rust resistance. Tests were performed at the seedling stage in the growth chamber and as adult plants in the field. All accessions and six cultivars were scored as resistant against race 24 under all test conditions, with very few plants as exceptions, while the susceptible control cultivars ‘Karat’ and ‘Certina’, and four other cultivars were attacked in all cases. Differences between accessions and between cultivars were detected after infection with isolates from ‘Trumpf’ and ‘Bigo’ (seedling tests only). Infection structures within seedling leaves without pustules and for the first time within leaves of adult plants from the field were analysed by fluorescence microscopy. With this method additional genetic Differences in the resistance reaction could be detected which could not to be seen in the resistance test. Crosses between the accessions and the susceptible cultivar ‘Karat’ led to segregating F2 progenies. The percentage of resistant plants varied between the accessions. This also indicates a different genetic basis of resistance in the accessions. The infection structures observed by fluorescence microscopy stopped earlier in leaves of the two accessions HOR 8979 and HOR 8991 than in leaves of other accessions in all the tests. These accessions were the only ones with more than 50% resistant plants in all F2 tests. In general, the accessions from the gene bank can be used as new resistance sources against stripe rust.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.2000.tb01676.x
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of resistance of apricot cultivars to a Spanish isolate of plum pox potyvirus (PPV) (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 119 (2000), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The resistance of 12 apricot cultivars to the Dideron type Spanish isolate RB3.30 of plum pox potyvirus was evaluated in controlled conditions in an insect-proof greenhouse. The results of the evaluation demonstrated the resistance of the cultivars ‘Stella’, ‘Stark Early Orange’, ‘Goldrich’, ‘Harcot’, ‘NJA2’, ‘Pandora’ and ‘Avilara’ to the isolate, and the susceptibility of the cultivars ‘A1453’, ‘Bulida’,‘Currot’, ‘Real Fino’ and ‘Canino’
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2000.00457.x
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  • 4
    Electronic Resource
    Electronic Resource
    Marker analysis for quantitative traits in sugar beet (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 119 (2000), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Many economically important traits are inherited quantitatively and are analysed by breeders in replicated field trials. If dense maps are available, chromosomal regions containing quantitative trait loci (QTL) can be identified and this opens up the possibility of preselecting for quantitative traits in the laboratory. In this study, QTL analysis for yield and yield components in sugar beet is used in two different populations tested in several environments in both populations, QTL were detected for all traits investigated, and their predictive value in breeding schemes was analysed by correlating predicted with observed values. Tolerance to Rhizomania, caused by a gene on chromosome 3, was the main source of genotype-environment interaction in one population, allowing selection on a QTL basis within macro-environments with or without Rhizomania infestation, respectively. No clear results were found for the second population tested in environments with and with-out Cercospora infestation. Consequences for breeding strategies are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2000.00482.x
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  • 5
    Electronic Resource
    Electronic Resource
    Selection for sugar yield in sugar beet, Beta vulgaris, using different selection indices (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 119 (2000), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In sugar beet breeding, sugar yield is mainly influenced by root yield and sugar content. In this short communication several indices to select for both traits simultaneously are compared in order to find the best one. The indices are correlated with the base index of Williams (1962) from independent experiments. The indices differ in the amount of information necessary for the calculation of their weights. Three different series of each eight sites gave similar results. The optimum index using all information from phenotypic and genotypic variances and covariances, did not perform best. Sugar content with its higher herit ability must have a larger weight than root yield. Heritabilities as index weights performed best, but two other indices using heritabilities and phenotypic but no genetic covariances also performed well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2000.00476.x
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