Effect of incubation temperature on zearalenone production by strains of Fusarium crookwellense.
After 6 weeks incubation on rice 2 strains of Fusarium crookwellense produced more zearalenone (6060-5010 mg/kg dry wt of culture) at ambient temperature (16-29 degrees C) in daylight than at ambient temperature (18-23 degrees C) in darkness or at controlled temperatures of 11 degrees C, 20 degrees C or 25 degrees C in darkness. Yields at 25 degrees C were low. Incubation at 11 degrees C during the second 3 weeks incubation increased yields only when preliminary incubation had been at 25 degrees C. After 6 weeks incubation at controlled temperatures in darkness, 4 strains produced most zearalenone at 20 degrees C (2460-21 360 mg/kg), 1 strain at 11 degrees C (6570 mg/kg). Yields at a temperature oscillating daily from 10-20 degrees C were less than at 15 degrees C. One of the 5 strains produced appreciable amounts of a-zearlaenol (1645 mg/kg at 20 degrees C) and 2 of nivalenol (340 and 499 mg/kg at 20 degrees C).
Di Menna
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ME
Ruakura Agricultural Centre, Ministry of Agriculture and Fisheries, Hamilton, New Zealand.
Lauren
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DR
Smith
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WA
D005670:Fusarium / Q000378:metabolism*; D008027:Light; D009183:Mycotoxins / Q000096:biosynthesis; D013696:Temperature; D014255:Trichothecenes / Q000096:biosynthesis; D015025:Zearalenone / Q000096:biosynthesis*; D015029:Zeranol / Q000031:analogs & derivatives / Q000378:metabolism
D009183:Mycotoxins; D014255:Trichothecenes; C029659:zearalenol; D015025:Zearalenone; C038405:nivalenol; D015029:Zeranol