Natural occurrence of trichothecenes in domestic wheats and barleys harvested in 1990 and 1991, and production of mycotoxins by Fusarium isolates from these samples

Abstract

The occurrence of deoxynivalenol (DON) and nivalenol (NIV) was surveyed on domestic wheat and barley samples harvested in 1990 and 1991, and the 11 strains of Fusarium species were isolated from the tested samples and were examined on their producibility of mycotoxins such as DON and NIV. Among the 44 samples (27 of wheat and 17 of barley samples), 15 wheat and 14 barley samples were positive for NIV and 7 wheat samples and 8 barley samples were positive for DON, respectively. Multiple contamination of NIV and DON was detected on 6 wheat and 7 barley samples. Six isolates of Fusarium graminearum from 4 barley samples which had been contaminated with Fusarium toxins, produced NIV on polished rice culture.