FEMS Microbiology Letters 2012-01-01

Cytological evaluation of the effect of azoxystrobin and alternative oxidase inhibitors in Botrytis cinerea.

Kanako Inoue, Tomohiro Tsurumi, Hideo Ishii, Pyoyun Park, Kenichi Ikeda

Index: FEMS Microbiol. Lett. 326(1) , 83-90, (2012)

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Abstract

Azoxystrobin (AZ), a strobilurin-derived fungicide, is known to inhibit mitochondrial respiration in fungi by blocking the electron transport chain in the inner mitochondrial membrane. Germination was strongly inhibited when Botrytis cinerea spore suspension was treated with AZ and the alternative oxidase (AOX) inhibitors, salicylhydroxamic acid (SHAM) and n-propyl gallate. However, chemical death indicators trypan blue and propidium iodide showed that those spores were still alive. When the spore suspension in the AZ and SHAM solution was replaced with distilled water, the germination rate almost recovered, at least during the first 2 days of incubation with AZ and SHAM solution. No morphological alteration was detected in the cells treated with AZ and SHAM, especially in mitochondria, using transmission electron microscopy. Therefore, simultaneous application of AZ and AOX inhibitors has a fungistatic, rather than a fungicidal, action.© 2011 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.