Production of 8-ketotrichothecenes by Fusarium graminearum on Corn and Barley
1998
Seo Yong Su | Seo Jeong Ah Division of Applied Biology and Chemistry and Research Center for New-Biomaterials in Agriculture, College of Agriculture and Life Sciences, Seoul National Unversity, Suwon 441-744 (Korea Republic)
The production of 8-ketotrichothecenes, deoxynivalenol (DON), nivalenol (NIV), and their monoacetyl derivatives was studide in rice and corn cultures using 8 isolates of Fusarium graminearum which were obtained from corn and barley smaples. Higher concentrations of trichothecenes were produced on rice than corn, and production of the toxins on rice was enhanced by growing the fungi at 25 degrees. The isolates were used for evaluation of toxin production and pathogenicity after artificial inoculation to 5 corn and 3 barley cultivars. The kinds and the relative amounts of trichothecenes produced in cultures were consistent with those in infected kernels of corn and barley with some exceptions. As for DON chemotypes, the ratios of 15-acetyl-DON to 3-acetyl-DON were varied among the pathogen-cultivar interactions. The corn and barley cultivars showed the significant differences of resistance to the Fusarium isolates in disease severity and seedling blight, and resistance ranking to the different isolates was varied. However, significant correlations were observed between the total concentrations of trichothecenes in infected kernels of corn and barley and pathogenicities of the Fusarium isolates to their hosts.
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