Effect of wheat spike infection timing on fusarium head blight development and mycotoxin accumulation

Effect of wheat spike infection timing on fusarium head blight development and mycotoxin accumulation

Fusarium head blight in wheat spikes is associated with production of mycotoxins by the fungi. Although flowering is recognized as the most favourable host stage for infection, a better understanding of infection timing on disease development and toxin accumulation is needed. This study monitored th...

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Bibliographic Details
Published in:Plant pathology Vol. 63; no. 2; pp. 390 - 399
Main Authors: Siou, D., Gélisse, S., Laval, V., Repinçay, C., Canalès, R., Suffert, F., Lannou, C.
Format: Journal Article
Language:English
Published: Oxford Blackwell 01-04-2014
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Subjects:
Biological and medical sciences
Environmental Sciences
flowering date
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
Fusarium culmorum
Fusarium graminearum
Fusarium poae
Global Changes
Phytopathology. Animal pests. Plant and forest protection
toxin productivity
Monocotyledones
Plant pathology
Plant pathogen
Mycosis
Mycotoxin
Accumulation
Fungi
Fusarium culmorum
Triticum
Gramineae
Angiospermae
Development
Flowering
Fungi Imperfecti
C3-Type
Productivity
Vegetals
Fusarium graminearum
toxin productivity
Ear(plant)
flowering date
Fusarium poae
Date
Infection
Toxin
Spermatophyta
Timing
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Description
Summary:Fusarium head blight in wheat spikes is associated with production of mycotoxins by the fungi. Although flowering is recognized as the most favourable host stage for infection, a better understanding of infection timing on disease development and toxin accumulation is needed. This study monitored the development of eight characterized isolates of F. graminearum, F. culmorum and F. poae in a greenhouse experiment. The fungi were inoculated on winter wheat spikes before or at anther extrusion, or at 8, 18 and 28 days later. Disease levels were estimated by the AUDPC and thousand‐kernel weight (TKW). The fungal biomass (estimated by qPCR) and toxin concentration (deoxynivalenol and nivalenol, estimated by UPLC‐UV‐MS/MS) were measured in each inoculated spike, providing a robust estimation of these variables and allowing correlations based on single‐individual measurements to be established. The toxin content correlated well with fungal biomass in kernels, independently of inoculation date. The AUDPC was correlated with fungal DNA, but not for early and late infection dates. The highest disease and toxin levels were for inoculations around anthesis, but early or late infections led to detectable levels of fungus and toxin for the most aggressive isolates. Fungal development appeared higher in kernels than in the chaff for inoculations at anthesis, but the opposite was found for later inoculations. These results show that anthesis is the most susceptible stage for FHB, but also clearly shows that early and late infections can produce significant disease development and toxin accumulation with symptoms difficult to estimate visually.
ISSN:0032-0862
1365-3059
DOI:10.1111/ppa.12106