Authors:S. M. Imathiu, R. V. Ray, M. Back, M. Hare, and S. G. Edwards
Fusarium langsethiae is a fungus that has recently been implicated in the contamination of small-grain cereal crops such as oats, wheat and barley with high levels of HT-2 and T-2 toxins in many European countries. The epidemiology of this fungus is not well known and may therefore be a bigger problem than currently thought to be. A study was carried out investigating the in vitro growth characteristics of F. langsethiae isolates from contaminated oats and wheat at various temperatures; 15, 20, 25 and 30 °C. Results indicated similar growth trends of oats and wheat isolates of F. langsethiae. Wheat isolates grew significantly (p<0.001) faster than oat isolates although this difference may have been confounded by the age of cultures, with oat isolates collected one year earlier. The estimated optimum growth temperature for all isolates was 24 °C. Isolates were macro-morphologically categorized as having lobed or entire colony margins, and either possessing one of the following colony colours: white, orange or purple. Since the estimated optimum growth temperature of F. langsethiae is typical in temperate summers when small-grain cereals are flowering, it is possible that this species can infect, colonise and possibly contaminate the developing grains with HT-2 and T-2 toxins which are of food safety concern.
Authors:B. Baráti-Deák, Cs. Mohácsi-Farkas, and Á. Belák
. Growth curves were generated from the absorbance values versus time data, using the average of triplicates. 1.5 Characterisation of antagonistic bacteria For characterisation of the isolated bacteria, analyses of optimalgrowthtemperature and pH, KOH
Authors:Abeer H. Ali, Usama Radwan, Soad El-Zayat, and Magdi A. El-Sayed
optimumgrowthtemperature of 50 °C. T. lanuginosus is an ascomycete that grows rapidly on various media whose colonies reaching 2.5 to over 5 cm in diameter at 45–50 °C within 2 days ( Singh et al., 2003 ). T. lanuginosus thermally adapted by the