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Genetic variation of aggressiveness in individual field populations ofFusarium graminearum andFusarium culmorum tested on young plants of winter rye

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Abstract

Fusarium graminearum andF. culmorum are capable of infecting winter cereals at all growth stages. From natural field epidemics of wheat head blight and rye foot rot, three fungal populations were collected with 21, 38 and 54 isolates, respectively; their aggressiveness was analyzed in comparison to collections ofF. graminearum (25 isolates) andF. culmorum (70 isolates) that represent a wide range of geographical locations and host species. All isolates were tested for aggressiveness on young plants of winter rye in the greenhouse and scored for disease severity on a 1–9 scale. Disease ratings of individual isolates ranged from 1.5 to 5.7 indicating quantitative variation of aggressiveness. Genotypic variance was highest in the twoFusarium collections. No substantial difference was found in the amount of genotypic variation betweenF. graminearum andF. culmorum. Individual field populations revealed 57–66% of the total genotypic variation of the collections. This implies a high degree of diversity of aggressiveness within single field populations ofF. graminearum andF. culmorum causing natural epidemics.

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Authors and Affiliations

  1. State Plant Breeding Institute (720), University of Hohenheim, Fruwirthstr. 21, D-70593, Stuttgart, Germany

    Thomas Miedaner

  2. Institute of Plant Breeding, Seed Science and Population Genetics (350), University of Hohenheim, Fruwirthstr. 21, D-70593, Stuttgart, Germany

    Angela G. Schilling

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  1. Thomas Miedaner
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  2. Angela G. Schilling
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Miedaner, T., Schilling, A.G. Genetic variation of aggressiveness in individual field populations ofFusarium graminearum andFusarium culmorum tested on young plants of winter rye. Eur J Plant Pathol 102, 823–830 (1996). https://doi.org/10.1007/BF01877051

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