Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.
Departamento de Microbiología e Inmunología, Facultad de Ciencias Exactas Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.
Int J Food Microbiol. 2018 Nov 20;285:69-73. doi: 10.1016/j.ijfoodmicro.2018.07.028. Epub 2018 Jul 24.
Fusarium meridionale has been frequently isolated from soybean in Argentina and showed similar pathogenicity as F. graminearum sensu stricto. However, no data on their growth and mycotoxin production under different environmental conditions are yet available. The aims of this study were: to determine the effect of temperature, water activity (a) and strain on growth of F. meridionale and to evaluate deoxynivalenol (DON) and nivalenol (NIV) production in a soybean based medium. The results showed that optimal conditions for F. meridionale growth were at 25 °C and 0.98-0.99 a. Deoxynivalenol production was favored at 25 °C and 0.96 a while NIV production was strain-dependent, being 30 °C and 0.98 a optimal conditions for F. meridionale B2300 strain and 20 °C and 0.98 a for F. meridionale F5043 and F. meridionale 5048 strains. These conditions are similar to those observed at pre-harvest stage in soybean crop, thus control strategies need to be considered to reduce the risk of the occurrence of DON and NIV in harvested grains.
南方镰刀菌已频繁从阿根廷的大豆中分离出来，其表现出与禾谷镰刀菌（F. graminearum sensu stricto）相似的致病性。然而，关于其在不同环境条件下的生长和产毒情况的数据尚未见报道。本研究的目的是：确定温度、水分活度（a）和菌株对南方镰刀菌生长的影响，并评估其在基于大豆的培养基中产脱氧雪腐镰刀菌烯醇（DON）和雪腐镰刀菌烯醇（NIV）的情况。结果表明，南方镰刀菌生长的最佳条件为 25°C 和 0.98-0.99 a。DON 的产生在 25°C 和 0.96 a 时较为有利，而 NIV 的产生则取决于菌株，对于 B2300 菌株，最佳条件为 30°C 和 0.98 a，对于 F5043 和 5048 菌株，最佳条件为 20°C 和 0.98 a。这些条件与大豆作物收获前阶段的情况相似，因此需要考虑控制策略来降低收获谷物中 DON 和 NIV 发生的风险。
