Effects of Storage Temperature and Grain Moisture Content on the Contaminaton of Fusarium and Fusariotoxin in Hulled Barley Grains
2017
Ham, H., National Institute of Agricultural Sciences (NAS), Wanju, Republic of Korea | Lee, K.A., National Institute of Agricultural Sciences (NAS), Wanju, Republic of Korea | Lee, T., National Institute of Agricultural Sciences (NAS), Wanju, Republic of Korea | Han, S., National Institute of Agricultural Sciences (NAS), Wanju, Republic of Korea | Hong, S.K., National Institute of Agricultural Sciences (NAS), Wanju, Republic of Korea | Lee, S., National Institute of Agricultural Sciences (NAS), Wanju, Republic of Korea | Ryu, J.G., National Institute of Agricultural Sciences (NAS), Wanju, Republic of Korea
Fusarium graminearum is a mycotoxigenic plant pathogen, which could remain in harvested barley grains and produces mycotoxins at preferable conditions during storage. To elucidate the factors affecting contamination of Fusarium and Fusariotoxin in hulled barley during storage, three hulled barley grain samples were collected from Jeolla province. Moisture content of each sample was adjusted to 14% and 20%, respectively, then stored in two warehouses where temperature was controlled differently: one controlled below 12℃, and the other with no control. While monitoring temperature and relative humidity of warehouses hourly, grain moisture content, Fusarium occurrence, and mycotoxin level was analyzed at 1, 3, 6, and 12 month after storage. The average monthly temperature and relative humidity ranged 3~29o C, and 58~70% in warehouse without temperature control, whereas 3~13℃ and 62~ 74% in warehouse controlled below 12o C. Grain moisture content of the samples decreased in both warehouses except 14% samples which increased in the warehouse with temperature control. Fusarium frequency of the contaminated grains decreased continuously in the warehouse without temperature control. But in the warehouse below 12o C, Fusarium decreasing rate was slower because of high grain moisture content. In most samples, nivalenol was detected more in the warehouse without temperature control after 12 month but there was little difference after 1, 3, and 6 month. Therefore, it will be efficient to store hulled barley in the warehouse controlled below 12℃ to reduce Fusarium contamination when the barley is not dried properly. In addition, when storage period exceeds 12 month, it is recommended to store hulled barley in a warehouse controlled below 12℃ to reduce nivalenol contamination.
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