title: Impact of cycling temperatures on Fusarium verticillioides and Fusarium graminearum growth and mycotoxins production in soybean.
abstract: BACKGROUND
  Fusarium graminearum and F. verticillioides are two very important mycotoxigenic species as they cause diverse diseases in crops. The effects of constant and cycling temperatures on growth and mycotoxin production of these species were studied on soybean based medium and on irradiated soya beans.
  
  
  RESULTS
  F. graminearum grew better when was incubated at 15, 20 and 15-20 °C (isothermal or cycling temperature) during 21 days of incubation. Maximum levels of zearalenone and deoxynivalenol (39.25 and 1040.4 µg g(-1), respectively) were detected on soya beans after 15 days of incubation and the optimal temperature for mycotoxin production was 15 °C for zearalenone and 20 °C for deoxynivalenol. F. verticillioides grew better at 25 °C in culture medium and at 15/20 °C and 15/25 °C on soybean seeds. Fumonisin B(1) was produced only in culture medium, and the maximum level (7.38 µg g(-1)) was found at 15 °C after 7 days of incubation.
  
  
  CONCLUSIONS
  When growth and mycotoxin production under cycling temperatures were predicted from the results under constant conditions, observed values were different from calculated for both species and substrate medium. Therefore, care should be taken if data at constant temperature conditions are to be extrapolated to real field conditions.
authors.affiliation: Food Technology Department, Lleida University, UTPV-XaRTA-CRA, Lleida, Spain.
authors.forename: Daiana
authors.initials: D
authors.lastname: Garcia
authors.forename: Germán
authors.initials: G
authors.lastname: Barros
authors.forename: Sofía
authors.initials: S
authors.lastname: Chulze
authors.forename: Antonio J
authors.initials: AJ
authors.lastname: Ramos
authors.forename: Vicente
authors.initials: V
authors.lastname: Sanchis
authors.forename: Sonia
authors.initials: S
authors.lastname: Marín
mesh_terms: D005516:Food Microbiology; D005670:Fusarium / Q000254:growth & development* / Q000378:metabolism*; D009183:Mycotoxins / Q000032:analysis / Q000096:biosynthesis*; D012639:Seeds / Q000737:chemistry / Q000382:microbiology*; D013025:Glycine max / Q000382:microbiology*; D013696:Temperature; D014255:Trichothecenes / Q000032:analysis / Q000096:biosynthesis; D015025:Zearalenone / Q000032:analysis / Q000096:biosynthesis
chemical_list: D009183:Mycotoxins; D014255:Trichothecenes; D015025:Zearalenone; C007262:deoxynivalenol