Characterization of Colletotrichum graminicola Isolates Resistant to Strobilurin-Related QoI Fungicides

Plant Disease
Cruz Avila-AdameW Köller

Abstract

Isolates of Colletotrichum graminicola were collected from annual bluegrass or bent grass turf in Japan and the United States, and their sensitivities to QoI fungicides (QoIs) as well as their cytochrome b sequences were characterized. Five isolates sampled from turf treated repeatedly with azoxystrobin were highly QoI resistant under both in vivo and in vitro test conditions. The nucleotide sequences of a large cytochrome b gene segment involving the binding site of QoIs were fully homologous for all resistant isolates and contained the G143A target site mutation known to confer QoI resistance in other pathogens. QoI-sensitive isolates collected prior to treatments with QoIs were more diverse with regard to their cytochrome b gene sequences and their phenotype responses to QoIs. All wild-type isolates retained a glycine in position 143 of cytochrome b. Three of the four QoI-sensitive isolates were, in addition, distinguished by leucines in positions 95, 130, and 141, which were exchanged to threonine in all resistant but also in one of the sensitive isolates. In addition to a more pronounced divergence of cytochrome b sequences, the sensitive wild-type isolates also were diverse with regard to the induction of alternative resp...Continue Reading

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Citations

Apr 26, 2016·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Camila Chevonica VandresenSandra Mara Woranovicz Barreira
Jan 1, 2016·Plant Disease·Robyne BownessStephen E Strelkov
Dec 1, 2015·Plant Disease·Lina M Rodriguez-SalamancaMary K Hausbeck
Nov 1, 2015·Plant Disease·Paul P PriceSebastian Albu

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