EFS12- Book of abstracts - Contact
EFS12- Book of abstracts - Contact
EFS12- Book of abstracts - Contact
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SESSION 4: GENETICS OF HOSTS – PLANT RESISTANCE TO FUSARIUM,<br />
VARIETY DEVELOPMENT<br />
P84 - Evaluation <strong>of</strong> German winter wheat cultivars for<br />
resistance against Fusarium head blight and<br />
mycotoxin reduction<br />
B. Rodemann<br />
Julius Kühn-Institut, Institute <strong>of</strong> plant protection in field crops and grassland, Messeweg 11/12, 38104<br />
Braunschweig, Germany,<br />
E-mail: bernd.rodemann@jki.bund.de<br />
Fusarium head blight (FHB) caused by Fusarium graminearum (Schwabe) and<br />
Fusarium culmorum (W.G. Smith) belongs to the most damaging disease in<br />
cereal crops. Both species were described to produce deoxynivalenol (DON) and<br />
DON derivatives and zearalenone depends on the proved isolates. Different<br />
studies revealed significant relations between DON content and characteristics <strong>of</strong><br />
FHB infection. However the relationship between disease symptoms and DON<br />
content is not yet well understood in every case. This could be important for<br />
minimizing the risk <strong>of</strong> mycotoxin contamination <strong>of</strong> grains and foodstuffs.<br />
For <strong>of</strong>ficial cultivar disease ranking, the susceptibility <strong>of</strong> German cultivars and new<br />
breeding lines against FHB was evaluated every year. Under field conditions the<br />
FHB nursery was investigated at six different sites in Germany.<br />
Furthermore, the FHB and AUDPC were calculated using both incidence and<br />
severity. In some cases the DON contamination <strong>of</strong> the grains was also analyzed.<br />
New registered winter wheat cultivars in 2010 and 2011 showed FHB symptoms<br />
between 5 to 55% assessed 28 days after inoculation.<br />
Investigated grain samples showed DON contents up to 7.4 mg/kg. A strong<br />
correlation coefficient (r=0.74**) was observed between visual disease symptoms<br />
and mycotoxin concentrations. In accordance to this data a ranking for FHB and<br />
DON on a scale from 1-9 (1= low susceptible / low toxin; 9= high susceptible /<br />
high toxin) could be made. By cultivation low fusarium susceptible varieties the<br />
DON contamination could be reduced by 50-70%. The performance <strong>of</strong> resistance<br />
cultivars in reduction <strong>of</strong> deoxynivalenol is comparable to the efficacy <strong>of</strong> fungicides<br />
used for fusarium head blight control.<br />
Keywords: Fusarium, cultivar, resistance, mycotoxins<br />
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