Level ofFusarium infection in wheat spikelets related to location and number of inoculated spores |
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Authors: | R Schuster F M Ellner |
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Institution: | 1. Plant Analysis and Stored Product Protection, Julius Kühn-Institut, Federal Research Centre for Cultivated Plants, Institute for Ecochemistry, K?nigin-Luise-Str. 19, 14195, Berlin-Dahlem, Germany
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Abstract: | The flowering time is the most susceptible period for primary infection of wheat heads byFusarium spp. During this period spores can be deposited into the opened wheat florets where they may later cause infections. We quantitatively
explored the relationship between variables related to the flowering process and the infection level byFusarium graminearum in single spikelets. We imitated open (chasmogamous) and closed (cleistogamous) flowering by injecting well-defined amounts
of spores into and between wheat florets. Applying the spores between the florets resulted in weaker disease symptoms and
significantly lower amounts ofFusarium mycotoxins. With larger numbers of spores, the disease symptoms became more pronounced and the mycotoxin amounts per spikelet
increased significantly.
Our results indicate that the probability of primary infection is approximately proportional to the number of spores reaching
the open florets during the flowering process. The breeding of wheat lines which flower partially or completely cleistogamously
might reduce theFusarium susceptibility in wheat. |
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Keywords: | wheat Fusarium graminearum mycotoxin deoxynivalenol single spikelet infection |
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