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Mycotoxin Research

, Volume 16, Supplement 1, pp 50–53 | Cite as

Characterisation offusarium graminearum andF. culmorum isolates by mycotoxin production and aggressiveness to wheat

  • Muthomi JW 
  • Dehne HW 
  • Oerke EC 
  • Mutitu EW 
  • Hindorf H 
Article
  • 47 Downloads

Abstract

A total of 27Fusarium culmorum isolates from Germany and 41F. graminearum isolates from Kenya were investigated for aggressiveness and mycotoxin production on wheat ears. In addition, ergosterol content of the kernels from ears inoculated withF. graminearum was determined and theF. culmorum isolates were tested for mycotoxin productionin vitro. For both pathogens, isolates markedly differed in aggressiveness. 59% and 37% of theF. culmorum isolates produced NIV and DON, respectively,in vivo andin vitro. The DON-producing isolates also produced 3-acDONin vitro. The more aggressive isolates produced mainly DON while the less aggressive isolates produced mainly NIV. 12% and 85% of theF. graminearum isolates produced NIV and DON, respectively. The highly aggressive isolates produced higher amounts of DON, aggressiveness being highly correlated to DON content in the kernels. NIV-producing isolates were less aggressive. Ergosterol content of kernels was moderately correlated to aggressiveness but highly correlated to DON content. Disease severity was associated with kernel weight reduction.

Keywords

Graminearum Fusarium Head Blight Deoxynivalenol Tebuconazole Prochloraz 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Zusammenfassung

27 Isolate vonFusarium culmorum aus Deutschland und 41 Isolate vonF. graminearum aus Kenia wurden auf ihre Aggressivität und Mykotoxinbilung an Weizenähren untersucht. Die Isolate beider Arten unterschieden sich in ihrer Wirkung auf das TKG bzw. in der Symptomausprägung an der Ähre. Die aggressiveren Isolate bildeten vor allem Deoxynivalenol (F. culmorum 59%,F. graminearum 85%), Nivalenol-produzierende Isolate verursachten geringere Schäden. Diein vitro-Mykotoxinbildung (auf autoklavierten Maiskörnern) vonF. culmorum war sehr eng mit derin vivo korreliert. Der Ergosterolgehalt der Körner als Maß für die pilzliche Biomasse war enger mit dem DON-Gehalt als mit der Aggressivität der Isolate korreliert.

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Copyright information

© Society of Mycotoxin Research and Springer 2000

Authors and Affiliations

  • Muthomi JW 
    • 1
  • Dehne HW 
    • 2
  • Oerke EC 
    • 2
  • Mutitu EW 
    • 1
  • Hindorf H 
    • 2
  1. 1.Dept. of Crop ProtectionUniversity of NairobiNairobiKenya
  2. 2.Inst. f. PflanzenkrankheitenUniversität BonnBonnGermany

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