Evaluation of the durability of the Barley yellow dwarf virus-resistant Zhong ZH and TC14 wheat lines
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Serial passage experiments (SPE) of a Barley yellow dwarf virus-PAV (BYDV-PAV) isolate were performed on Zhong ZH and TC14 wheat lines to evaluate the durability of their resistance to BYDV. At different passage numbers (from the 2nd to the 114th), biological properties of the produced isolates were recorded either by monitoring infection percentages and virus titers of the first 3 weeks of viral infection or by measuring their impact on yield components. Statistical analyses using the area under pathogen progress curves and the area under concentration progress curves demonstrated that these two resistant lines induce, after only a few passages, a selection of variant(s) with significantly modified infection abilities. Isolates resulting from SPE performed on these lines induced important decreases of yield components. These results indicate that the use of Zhong ZH and TC14 lines in BYDV-resistant breeding programmes should be approached with caution.
KeywordsAUCPC AUPPC Luteovirus resistance-breaking viral titer
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The authors wish to thank Olivier Valles, Gaëlle Mauvais, Pierrick Roulier, Agnès Delaunay and Christine Helloco-Kervarrec for their help in data acquisition, Joseph Jahier for providing seeds, and Charles-Antoine Dedryver and Tyler Avis for critical reviews and revision of the manuscript. This work was supported by the French National Institute for Agronomic Research (INRA) and Région Bretagne.
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