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Cytochrome b gene structure and consequences for resistance to Qo inhibitor fungicides in plant pathogens

Grasso, Valeria, Palermo, Simona, Sierotzki, Helge, Garibaldi, Angelo, Gisi, Ulrich·2006·Pest Management Science

Abstract

The cytochrome b (cyt b) gene structure was characterized for different agronomically important plant pathogens, such as Puccinia recondita f sp tritici (Erikss) CO Johnston, P graminis f sp tritici Erikss and Hennings, P striiformis f sp tritici Erikss, P coronata f sp avenae P Syd & Syd, P hordei GH Otth, P recondita f sp secalis Roberge, P sorghi Schwein, P horiana Henn, Uromyces appendiculatus (Pers) Unger, Phakopsora pachyrhizi Syd & P Syd, Hemileia vastatrix Berk & Broome, Alternaria solani Sorauer, A alternata (Fr) Keissl and Plasmopara viticola (Berk & Curt) Berlese & de Toni. The sequenced fragment included the two hot spot regions in which mutations conferring resistance to QoI fungicides may occur. The cyt b gene structure of these pathogens was compared with that of other species from public databases, including the strobilurin‐producing fungus Mycena galopoda (Pers) P Kumm, Saccharomyces cerevisiae Meyer ex Hansen, Venturia inaequalis (Cooke) Winter and Mycosphaerella fijiensis Morelet. In all rust species, as well as in A solani, resistance to QoI fungicides caused by the mutation G143A has never been reported. A type I intron was observed directly after the codon for glycine at position 143 in these species. This intron was absent in pathogens such as A alternata, Blumeria graminis (DC) Speer, Pyricularia grisea Sacc, Mycosphaerella graminicola (Fuckel) J Schröt, M fijiensis, V inaequalis and P viticola, in which resistance to QoI fungicides has occurred and the glycine is replaced by alanine at position 143 in the resistant genotype. The present authors predict that a nucleotide substitution in codon 143 would prevent splicing of the intron, leading to a deficient cytochrome b, which is lethal. As a consequence, the evolution of resistance to QoI fungicides based on G143A is not likely to evolve in pathogens carrying an intron directly after this codon. Copyright © 2006 Society of Chemical Industry

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Metadata

Authors
Grasso, V., Palermo, S., Sierotzki, H., Garibaldi, A., & Gisi, U.
Venue
Pest Management Science
Publisher
Wiley
Published
2006-05-11
Volume
62
Issue
6
Pages
465-472
ISSN
  • 1526-498X (ISSN-L)
  • 1526-4998
OpenAlex
W1964576755
Cited by
268
References
24
FWCI
12.67
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Cytochrome b gene structure and consequences for resistance to Qo inhibitor fungicides in plant pathogens. https://app.cochat.ai/papers/10.1002/ps.1236
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Grasso, V., Palermo, S., Sierotzki, H., Garibaldi, A., & Gisi, U. (2006). Cytochrome b gene structure and consequences for resistance to Qo inhibitor fungicides in plant pathogens. Pest Management Science. https://doi.org/10.1002/ps.1236

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