Differences between the succinate dehydrogenase sequences of isopyrazam sensitive Zymoseptoria tritici and insensitive Fusarium graminearum strains [* Cross-Reference *]

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Tiphaine Dubos; Matias Pasquali; Friederike Pogoda; Angèle Casanova; Lucien Hoffmann; Marco Beyer, 2012, "Differences between the succinate dehydrogenase sequences of isopyrazam sensitive Zymoseptoria tritici and insensitive Fusarium graminearum strains [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.LQDTX9, LIST Open Repository, V1
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Forty-one Zymoseptoria tritici strains isolated in Luxembourg between 2009 and 2010 were highly sensitive towards the new succinate dehydrogenase inhibitor (SDHI) isopyrazam, with concentrations inhibiting fungal growth by 50% (EC50) ranging from 0.0281 to 4.53μM, whereas 41 Fusarium graminearum strains isolated in Europe and Northern America between 1969 and 2009 were insensitive with the average rate of inhibition converging towards 28% with increasing isopyrazam concentration. Seven isolates of both species covering the range of isopyrazam sensitivities observed in the present study were selected for the sequencing of the subunits B, C and D of the succinate dehydrogenase (sdh) gene. Predicted sdh amino acid sequences of subunits B, C and D were identical among F. graminearum strains. By comparing with fungal strains where resistance towards SDHIs was previously reported, three variations were unique to F. graminearum; B-D130N located in the iron-sulfur cluster [2Fe-2S], B-A275T located in the [3Fe-4S] cluster and an additional S at amino acid position 83-84 of sdhC, probably modifying structurally the ubiquinone binding site and therefore the biological activity of the fungicide. No variation was found among the Z. tritici strains in subunits B and D. Two variations were observed within the subunit C sequences of Z. tritici strains: C-N33T and C-N34T. The difference in EC50 values between Z. tritici strains with the NN and TT configuration was non-significant at P=0.289. Two outliers in the Z. tritici group with significantly higher EC50 values that were not related to mutations in the sdhB, sdhC, or sdhD were detected. The role of isopyrazam for the control of F. graminearum and Z. tritici in Luxembourg is discussed. © 2012 Elsevier Inc. (2012-11-28)
***This entry has been automatically imported via OpenAlex by LIST harvest scripts. Please refer to https://doi.org/10.1016/j.pestbp.2012.11.004 for the original and latest version of the publication*** (2026-07-01)
Subject Agricultural Sciences; Arts and Humanities; Medicine, Health and Life Sciences
Keyword Fusarium, Succinate dehydrogenase, Biology, EC50, Fungicide, Strain (injury), Amino acid, Protein subunit, Microbiology, Gene, Genetics, Enzyme, Biochemistry, In vitro, Botany
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