Potential of Wide Crosses to Improve the Resistance to Vomitoxin Accumulation in Wheat Following Infection by Fusarium Head Blight

摘要: Deoxynivalenol (DON) levels were determined in landraces of rye from Brazil, in a collection of triticales and a series of triticale amphiploids. Two of three rye landraces showed a resistant reaction to DON. Seven triticale accessions of the 371 score showed lower levels of incidence, severity and DON content. A total of eight Tritordeum (Triticum durum × Hordeum chilense amphiploids) were scored and showed lower DON levels. Stable lines with lower Fusarium head blight (FHB) and DON levels were selected in progenies from crosses of wheat to preselected accessions of Triticum monococcum and Aegilops speltoides. Both selections compared favourably to the check cultivars in term of agronomic traits indicating minimal linkage drag. One stable resistant line with lower DON levels was isolated in the F7 generation of progenies from crosses to Tritium timopheevii. Lower DON levels were observed in field trials of advanced generation progeny from crosses of wheat to Aegilops cylindrica and Triticum miguschovae. The findings indicate that the alien species accessions or segregating populations from the inter-specific or inter-generic hybridization can provide material with variability for DON content.