Correlation between Fusarium head blight severity and DON content in triticale as revealed by phenotypic and molecular data

摘要

Fusarium head blight (FHB) in triticale (xTriticosecale Wittmack) results in yield losses and mycotoxin contamination, for example, by deoxynivalenol (DON). This study aimed to analyse the correlation between FHB severity and DON content in a DH population of 146 entries across environments. Additionally, Fusarium damaged kernel (FDK) rating, heading stage and plant height were recorded. Highly significant (P<0.001) genotypic variances were found throughout, but also significant (P<0.001) genotype-environment interaction variances occurred. Correlation between FHB severity and heading stage or plant height was low (r=0.144 and r=-0.153, P<0.10). A prediction of DON content from FHB severity or FDK rating is not possible caused by low correlations (r=0.315 and 0.572, respectively, P<0.001). A common quantitative trait locus (QTL) for all FHB-related traits was found on wheat chromosome 2A being of minor importance for FHB severity, but of high importance for DON content and FDK rating. Another QTL on rye chromosome 5R was more important for FHB severity. In conclusion, DON content has to be measured in triticale after selection for FHB severity to gain for healthy and mycotoxin-reduced feed.