Characterization of mutants with single and combined Qi and Qo site mutations in Saccharomyces cerevisiae reveals interactions between the picolinamide fungicide CAS-649 and azoxystrobin.

Abstract excerpt

Picolinamide and strobilurin fungicides bind to the Qi and Qo sites on cytochrome b, respectively, and target many of the same plant pathogens. Using Saccharomyces cerevisiae as a model system, we explore effects of amino acid changes at each site on sensitivity to a fungicide acting at the opposite site and examine the relationship between altered sensitivity and growth penalty. In addition, double mutants...

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