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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Plant Science 68 (1990), S. 123-130 
    ISSN: 0168-9452
    Keywords: Verticillium wilt ; fluorescent vital staining ; root culture
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1871-4528
    Keywords: Verticillium wilt ; fungal diseases ; vascular disease ; serology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Zusammenfassung Von einem an Kartoffeln pathogenen Isolat vonVerticillium dahliae wurden aus Kulturflüssigkeiten extrazelluläre phytotoxische Protein-Lipopolysaccharid-Antigene (PLP) extrahiert. Nicht-absorbierte, in Kaninchen gegen pilzliche Körper-Antigene vonV. dahliae (Vd-body), gegen Vd-lösliche Antigene oder gegen die PLP-Antigene erzeugte Antiseren reagierten in der Gel-Doppel-Immunodiffusion mit allen fünf antigenen Präparationen. Bei Reaktion mit Extrakten schwach pathogener Arten vonVerticillium oder anderer Pilze zeigten die gegen PLP produzierten Antiseren Spezifität fürV. dahliae (Tab. I). Antiserum gegen ‘Vd-body’ zeigte Kreuzreaktion mit Extrakten vonV. nubilum undV. tricorpus, ferner mit Extrakten vonFusarium undColletotrichum und gelegentlich auch mit nicht-infizierten Kartoffelknollen (Tab. 1 und 2). Folglich scheinen sich die PLP-Antigene von den zuvor beschriebenen kreuzreagierenden und durch Antiseren gegen myzeliale Antigene vonV. dahliae ermittelten Antigenen zu unterscheiden. Antiseren gegen PLP reagierten mit Homogenaten von Kartoffelknollen. Stengeln und Blättern, welche vonV. dahliae-infizierten Pflanzen stammten, jedoch nicht mit Extrakten aus gesundem oder mit anderen pilzlichen Erregern infiziertem Kartoffelgewebe (Tab. 2). Als Mittel zur spezifischen Diagnose vonV. dahliae bei in Israel angebauten Kartoffeln zeigte Antiserum gegen PLP-Antigene grössere Eindeutigkeit als Antiserum, welches gegen Antigene aus dem pilzlichen Myzelkörper präpariert worden war.
    Abstract: Résumé Des antigènes extracellulaires phytotoxiques, composés d'un complexe protéines-lipopolysaccharides (PLP) ont été purifiés à partir d'une culture en milieu liquide d'un isolat deVerticillium dahliae pathogène pour la pomme de terre. Les antisérum produits par des lapins traités avec les antigènes du champignonV. dahliae (‘solide Vd’), les antigènes solubles Vd ou les antigènes PLP ont réagi en double immunodiffusion sur gel avec les cinq préparations d'antigènes. Lorsqu'il a été mis en présence d'extraits de souches faiblement pathogènes deVerticillium ou d'extraits d'autres champignons, l'antisérum issu des antigènes ‘solide VPL’ a donné une réaction croisée avec les extraits deV. nubilum etV. tricorpus, de même qu'avecFusarium etColletotrichum, et parfois avec les tubercules non infectés (tableaux 1 et 2). Ainsi, les antigènes PLP apparaissent ètre différents de ceux donnant les réactions antigéniques croisées décrites précédemment en vue de la détection par l'antisérum provenant du mycélium deVerticillium spp. L'antisérum PLP a réagi avec des broyats de tubercules, de tiges et de feuilles provenant de plantes infectées parV. dahliae, mais n'a pas réagi avec les extraits d'autres champignons pathogènes (tableau 2). Quand il a été utilisé pour le diagnostic spécifique deV. dahliae chez les pommes de terre cultivées en Israël, l'antisérum PLP s'est avéré plus fiable que l'antisérum préparé à partir du mycélium du champignon.
    Notes: Summary An extracellular protein-lipopolysaccaride antigen (PLP) was purified from culture fluids ofVerticillium dahliae. Antiserum produced in rabbits to the PLP detected the antigen in homogenates of tubers, stems and leaves ofV. dahliae-infected potato plants but not in extracts of healthy potato tissue or extracts of potato plants infected by other fungal pathogens. The antigen was not detectable in extracts of potato isolates ofV. tricorpus, V. nigrescens andV. nubilum or various other fungi. The antigen was shown to be different from cross-reactive antigens detected by antisera to mycelial antigens. When used as a tool for specific diagnosis ofV. dahliae infection in potato, antiserum to PLP was more reliable than that prepared against fungal body antigens.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1871-4528
    Keywords: Early-dying diseases ; early blight ; Verticillium wilt ; yield reduction ; seasonal effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effects of two major fungal diseases of potatoes growing in hot climates, early blight (Alternaria solani) and Verticillium wilt (Verticillium dahliae), were investigated in field trials. Large populations of clones were grown in the Negev, Israel in the Spring and Autumn seasons of three years, 1983, 1984 and 1985. Although symptoms of the diseases were seen in both seasons they were less severe in the Autumn. The effects ofA. solani on yield, when expressed as percent of the control plot yield were also less in the Autumn than the Spring. WithV. dahliae, however, the proportional effect on yield was greater in the Autumn. The decreases in yield associated with the two diseases were examined in terms of losses to the grower. The advantages of breeding for resistance/tolerance to these diseases were clear, emphasising the need for suitable screening techniques.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1871-4528
    Keywords: blackleg ; early blight ; Verticillium wilt ; maturity ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Tubers of 17 cultivars were inoculated withErwinia carotovora subsp.atroseptica (ECA) and planted in 1986 and 1987 in the Negev in randomised plots in three blocks where eitherVerticillium dahliae orAlternaria solani were present or where both were absent. ECA reduced the yield in the control block and exacerbated the yield losses in the disease blocks, but the intensity of symptom expression did not always accord with the extent of yield loss. ECA had a greater effect on plants infected withA. solani than on those withV. dahliae. It was possible to categorise the cultivars as resistant, intermediate or susceptible with respect to ECA and early blight, but resistance toV. dahliae could not be differentiated from foliage maturity.
    Type of Medium: Electronic Resource
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