Effects of Fusarium culmorum head blight on mycotoxin accumulation and yield traits in barley doubled haploids

The susceptibility of barley doubled haploids "DH# to Fusarium head blight "FHB# was investigated[ Heads of 13 DH lines "00 two!rowed and 02 six!rowed# derived from F0 Maresi "two!rowed# Pomo "six!rowed# hybrids were inoculated with a conidial suspension of the single isolate IPO237 90 of Fusarium culmorum[ The experiment was carried out in three consecutive years "0885 87# in one location[ The number of kernels per ear\ 0999!kernel weight and kernel weight per ear were recorded in inoculated and control plots[ In the infected kernels nivalenol "NIV# content and deoxynivalenol "DON# content were determined[ The e}ects of genotypeyear and genotype year interaction on reduction of yield traits were signi_cant[ For mycotoxin content only geno! type and year e}ects were found to be important[ The average NIV concentration in kernels of inoculated lines ranged from 9[04 mg:kg in the two!rowed line MP6 to 5[25 mg:kg in the six!rowed line MP002[ A low accumu! lation of DON was observed in the studied population "from 9[90 to 9[19 mg:kg#[ Generally\ no signi_cant di}erences in mycotoxin content were found between two!rowed and six!rowed genotypes[ The line MP6 was found to be superior with the lowest mycotoxin accumulation\ and reduction in yield traits[ Environ! mental conditions "years# a}ected DON and NIV level in kernels^ however\ the tendency to a lower or higher accumulation of mycotoxin in individual lines was stable over the years