A single isolate of Fnsurinm grumineurnm (DAOM 178148) was used to infect experimentdy 9 spring wheat, 5 rye and 6 triticale cultivars and the resulting amounts of fungal biomass (determined as ergosterol), deoxynivalenol and other mycotoxins at the same stage of development were compared.Resistant cultivars of wheat, rye and triticde contained low concentrations of deoxynivalenol (mean 0.6ppm) in the kernels, whereas susceptible cultivars of wheat and viticale contained much higher concentrations (mean 10.2 ppm). The corresponding chaffs contained ca. 8 fold higher concentrations. Higher ergosterol concentrations in the susceptible cultivars showed that these cultivm had lower resistance to hyphal invasion. Ergosterol to dcoxynivalenol ratios in the susceptible cultivars averaged c11. 2,4 and were much higher in the resistant, averaging ccl. 12 and cu. 240 for the wheat and rye, respectively. The data suggest that resistant cultivars have factors that prevent synthesis md/or promote degradation of dcoxynivalenol. Zearalenonc was not detected in any smple and 15acctyldeoxynivalenol was noted only in the chaff of the most susceptible wheat cultivu.
Zusammenfassung Deoxynivalenol und die Resistcnz gegen Fus;rrium-Taubfhrigkeit bci SommergctreideEin cinsclnes Isoht von Fnsuriwm gruminearnm (DAOM 178148) wurde eingesctzt, urn experimentell 9 Sommcrweizen-, 5 Roggen-und 6 Triticde KuItivare zu hfizieren und die rich ergebcnden Mengcn pilzlichcr Biomasse (bestimmt ds Ergosterol), Deoxynivalenol und lndere Mycotoxine sum gleichen Enrwicklungsstand LU vergleichen. Resistente Kdtivare von Weisen, Roggen und Triticale enthielten geringe Konzcntrationen von Deorynivalenol (Durchschnin 0,6 ppm) in den Kiirnern, whrend anfdlige Kultivare von Weizen und T n t i~d e wesentlich hohere Konzenuationen (Durchschnitt 10,2 ppm) enthielten. Das cntsprechcnde Stmh enthielt ca. 8md hohwe Konzentrationen. Hiihere Konzcntration von Ergosterol den anfagen Kultivaren teigten, d d diere Kultivue cine geringere Resistenz gegeniiber der Hypheninvasion hatten. Das Verhdiltnis -0~terol U.S. w g h c clunn~r Center cod.
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