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Vlatko Galić, Domagoj Šimić, Mario Franić, Andrija Brkić, Antun Jambrović, Josip Brkić and Tatjana Ledenčan

Abstract: Fusarium ear rot (FER) negatively affects maize production worldwide
and poses a serious threat to human health for producing mycotoxins. The
objectives of our study were to assess the factors affecting FER and fumonisin
contamination in testcrosses of a maize population. In the trials, seeds of 191
testcrosses of IBMSyn4, 11 checks and 2 replications of parental lines (a total of
216 hybrids) were sown in three environments, in 2014 and 2015. FER disease
intensity (DI), fumonisin contamination (FUMc) and number of ears with signs
of European corn borer (ECB) attack were measured. Strong phenotypic and
weak genetic correlations between DI, FUMc and ECB indicate randomness in
the interaction of those traits. We detected three QTLs (chr.1, 2 and 6) for DI
(LOD scores 3.77-5.06). The QTL on chr.2, confirmed across the environments,
can serve as a guideline in breeding for FER resistance.

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