Time of Fusarium inoculation and post-anthesis temperature stress affect FHB severity and DON concentration in winter wheat

Victor Okereke, Hannah Jones, Michael Gooding

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Abstract

Two pot experiments were conducted using elite lines and near isogenic lines (NILs) of winter wheat in a controlled environment to evaluate the effect of time of inoculation and subsequent increase in temperature during grain-filling on Fusarium head blight (FHB) and deoxynivalenol (DON) on the infected wheat grains. The experiments were a complete factorial combination with randomised replicates. Fusarium graminearum was used to spray inoculate wheat spikes at glume loose (GL). GL was established when the lower glume could be opened with a thumbnail. Fusarium inoculation was done at glume loose (GL+0), 4 and 8 days after (GL+4 and GL+8), respectively. Pots transferred to controlled environment cabinets set at 23/15oC or 28/20oC. Results reveal that FHB severity showed a significant (P<0.05) cultivar and temperature interaction in both elite and near isogenic lines. High temperature increased FHB severity by 35% in the NILs. DON concentration showed cultivar sensitive in both sets of cultivars. Inoculation at GL+4 which corresponded with the mid-anthesis gave the highest FHB severity and DON concentration in NILs, while the elite cultivars showed cultivar sensitive to DON accumulation regardless of the time of Fusarium inoculation.
Original languageEnglish
Pages (from-to)953-962
JournalJournal of Advances in Agriculture
Volume6
Issue number2
Publication statusPublished - 30 Jul 2016

Keywords

  • near isogenic lines
  • elite cultivars
  • glume loose
  • Fusarium Graminearum deoxynivalenol
  • Fusarium Head blight

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