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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 14 (1966), S. 638-640 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillian Magazines Ltd.
    Nature 412 (2001), S. 308-310 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A large fraction of the mass of the interstellar medium in our Galaxy is in the form of warm (103–104 K) and cool (50–100 K) atomic hydrogen (H i) gas. Cold (10–30 K) regions are thought to be dominated by ...
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, U.K. and Cambridge, USA : Blackwell Publishers
    Plant pathology 47 (1998), S. 0 
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Amplified fragment length polymorphism (AFLP) markers were used to determine genetic diversity and population structure of Pyrenopeziza brassicae, the causal agent of light leaf spot of Brassica spp. Fungal isolates were sampled from six regions in the UK, one region in Germany and one region in France. A high level of genetic diversity was found (HT = 58%), with most variation attributed to within regions (HS = 43%), which suggests that sexual reproduction is frequent. FST values suggested significant population differentiation between England and the continent, but not between Scotland and England and Scotland and the continent. Overall, a moderate but significant level of regional differentiation was found (FST = 16 ± 4.0). There was no correlation between FST values and distance, indicating that long-distance dispersal by natural factors does not occur at high frequencies. However, the lack of differentiation among populations from Aberdeen, Winchester and Cambridge suggests that seed transmission or other artificial methods of dispersal may be important.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, U.K. and Cambridge, USA : Blackwell Science Ltd
    Plant pathology 45 (1996), S. 0 
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Two monoclonal antibodies (MAbs) were produced against soluble antigens from the ‘Ascochyta complex’ fungi. Specificity of MAbs was tested by ELISA using antigen-coated wells. MAbs secreted by the monoclonal hybridoma cell line JIM 44 recognized epitopes present in the antigen preparations from Mycosphaerella pinodes and Phoma medicaginis var. pinodella, but not those present in preparations from Ascochyta pisi. At high tissue culture supernatant concentration, MAbs produced by the monoclonal line JIM 45 recognized epitopes from all three fungi, however, on dilution of MAb the antigens from A. pisi were recognized preferentially to those from M. pinodes and P. medicaginis var. pinodella. On the basis of heat and periodate treatment of the antigens from the three fungi it can be concluded that the epitope recognized by JIM 44 is carbohydrate in nature, whereas that recognized by JIM 45 is proteinaceous in nature, carried on a glycoprotein antigen. Antigen preparations from other fungi, including other pea pathogens, non-pathogens associated with pea and other fungi closely related to the ‘Ascochyta complex’, were not detected with either of the two MAbs. Antigen preparations from peas could be used to differentiate healthy and infected seeds in a dot-blot assay, therefore indicating the potential of using the MAbs in the development of a diagnostic test for infection of Pisum seeds by the ‘Ascochyta complex’ fungi.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 42 (1993), S. 0 
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: During a survey of root diseases of pea in Denmark, a new genetic variant of Fusarium oxysporum f.sp. pisi was isolated from vining peas in two widely separated geographical regions. In terms of pathogenicity on a set of differential pea lines, the Danish isolated closely resembled a race 6 isolate from the United States, DNA extracts of the isolates, restricted with the endonuclease HindIII, then probed with a homologous repetitive genomic fragment from the plasmid pDG106 by the Southern hybridization technique, gave a unique‘fingerprint’pattern distinctly different from the American race 6 and all other known races. When probed with pDG312, containing a homologous ribosomal repeat unit, the pattern obtained for the Danish isolates was indistinguishable from races 1, 5 and 6 but distinctly different from 2A and 2B. The Danish isolates represent a separate vegetative compatibility group because they are compatible with each other but incompatible with the other known races. In pigmentation the new variant resembled races 1, 5 and 6 for the first 8-12 days, after which it began to secrete a dark purple pigment resembling that of race 2A and 2B. Until an additional line in the host differentials can separate the new genetic variant it should be considered a subgroup of F. oxysporum f. sp. pisi race 6.
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 35 (1986), S. 0 
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Natural epidemics of Leptosphaeria maculans in cultivated populations of Brassica napus var. oleifera were predominantly monocyclic, involving a sequence of five phases; latent infection of the lamina, leaf lesion expression, symptomless systemic growth down the petiole, latent infection of the stem, and stem canker development. This sequence potentially terminated in severe stem cankers if initiated from ascospore infection of any leaf between a plastochron index of PI =n+ 0.5 and n+1.0 until plant growth stage 3.1 of the Harper & Berkenkamp scale. At PI 〈 n+ 0.5, infection was rare and at PI 〉 n+ 1.0, the infection sequence was usually terminated by leaf abscission. Differential effects of ambient temperature on the rates of progress of infection and leaf development determined whether abscission occurred before infection reached the stem. Based on these interrelationships, a system for predicting the incidence of severe stem cankers is proposed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 27 (1978), S. 0 
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In pots containing sand or sand-soil mixtures the commonly used ley grasses Dactylis glomerata, Festuca pratensis, Lolium multiflorum, L. perenne and Phleum pratense were equally effective in decreasing infections of wheat seedlings by Gaeumannomyces graminis var. tritici on wheat seedlings sown after the ley species had been grown. This effect could be attributed only partly to their ability to increase the incidence of the antagonist Phialophora radicicola var. graminicola which was either a natural inhabitant of the soil used, or added as an artificial culture. Other, unidentified, soil factors were equally important. Trifolium repens, and to a lesser degree Medicago sativa, also decreased infections by G. graminis var. tritici but without involvement of P. radicicola var. graminicola.
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  • 8
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: On the basis of pathogenicity tests on green berries or hypocotyls of coffee and by morphological and biochemical characteristics in culture, 31 isolates of Colletotrichum were classified into C. kahawe (24 isolates), C. gloeosporioides (six isolates) or C. acutatum (one isolate). Within these groups of isolates, vegetative compatibility groups (VCGs) were determined by complementation tests with mutants in the nitrate assimilation pathway. There were distinct incompatibility barriers between the three species. Among the C. gloeosporioides group, the three isolates tested were self-compatible but incompatible with each other. Within C. kahawe, 18 isolates were self-compatible and only one main VCG was detected. However, partial compatibility in C. kahawe was also indicated by variation in the intensity of heterokaryon formation between different pairs of isolates and between different types of mutant. The existence of only one VCG in C. kahawe is consistent with the low level of variation found in previous work on DNA polymorphism.
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 44 (1995), S. 0 
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Resistance to Polymyxa betae, the fungal vector of beet necrotic yellow vein virus, was studied in two wild beet species. Beta patellaris and B. procumbens. Plants grown in naturally infested soil or exposed to zoospore suspensions were examined in order to determine the stage in the life cycle of the fungus at which resistance was operating. Resting spores were never observed in the resistant species. Microscopic examination of stained transverse sections of fibrous roots taken at intervals after inoculation showed no evidence of even the earliest infection structures, the plasmodia; these were detected frequently in the epidermal cells of the susceptible Beta vulgaris. Use of the fluorescent stain DiOC6(3) to label zoospores showed that these were attracted to and attached themselves to the roots and root hairs of resistant species in the same way as to susceptible species. Maximum zoospore attachment was observed 1–6h after roots were exposed to zoospore suspensions. There was no obvious difference in the numbers attracted to resistant and susceptible hosts. Apparent infection of root hairs by encysted zoospores was observed in all three species. The resistance mechanism in the wild species must operate soon after this initial infection, possibly involving a hypersensitive response that prevents the subsequent development of plasmodia in epidermal cells.
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