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Gewählte Publikation:

LEMMENS, M., KRSKA, R., SCHUHMACHER, R., BUERSTMAYR, H., GRAUSGRUBER, H., RUCKENBAUER P..
(2004): The effect of long-term application of moisture on Fusarium head blight symptoms and deoxynivalenol contamination in wheat grains.
European Journal of Plant Pathology, 110, 299-308; 0929-1873

Abstract:
Fusarium head blight (FHB) is an important disease of wheat, which can result in the contamination of grains with mycotoxins such as deoxynivalenol ( DON). Artificial inoculation of flowering ears with conidial suspensions is widely used to study FHB diseases. Our goal was to compare four inoculation treatments in which a conidial suspension was sprayed on flowering ears and to study the effect of the application of moisture during kernel setting and filling with a mist-irrigation system. Ten wheat genotypes were inoculated with a DON-producing Fusarium culmorum strain. Inoculation treatments varied in time of application of the inoculum ( morning or evening) and in the method of controlling humidity during inoculation ( bagging or mist irrigation). A wet season was simulated with a mist-irrigation system, keeping the crop canopy wet for at least 26 days after flowering. The severity of FHB symptoms ( area under disease progress curve (AUDPC)), yield loss and DON contamination in the grains were determined. AUDPC data obtained with the different inoculation treatments were highly correlated ( r = 0.85 - 0.95). Mist irrigation after inoculation resulted in a higher mean disease severity, but in a overall lower toxin contamination as compared to the non-irrigated treatments. Genotypic differences in DON accumulation were present: for one wheat line toxin contamination significantly increased when irrigated, while two genotypes accumulated significantly less toxin. The closest relationships ( r = 0.73 - 0.89) between the visual symptoms and the DON content were obtained under moderate mean infection pressure. This relation between visual symptoms and the DON content deteriorated at higher infection levels.
Autor/innen der BOKU Wien:
Bürstmayr Hermann
Grausgruber Heinrich
Krska Rudolf
Lemmens Marc
Ruckenbauer Peter
Schuhmacher Rainer
BOKU Gendermonitor:


Find related publications in this database (Keywords)
artificial inoculation
Fusarium culmorum
humidity
mycotoxin
scab
Triticum aestivum


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