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Title of Journal: J Microbiol

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Abbravation: Journal of Microbiology

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The Microbiological Society of Korea

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DOI

10.1002/qj.4970021603

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1976-3794

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Involvement of alternative oxidase in the regulati

Authors: Ting Xu YaTing Wang WuSheng Liang Fei Yao YongHong Li DianRong Li Hao Wang ZhengYi Wang
Publish Date: 2013/04/26
Volume: 51, Issue: 3, Pages: 352-358
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Abstract

Sclerotinia sclerotiorum is a filamentous fungal pathogen that can infect many economically important crops and vegetables Alternative oxidase is the terminal oxidase of the alternative respiratory pathway in fungal mitochondria The function of alternative oxidase was investigated in the regulation of sensitivity of S sclerotiorum to two commercial fungicides azoxystrobin and procymidone which have different fungitoxic mechanisms Two isolates of S sclerotiorum were sensitive to both fungicides Application of salicylhydroxamic acid a specific inhibitor of alternative oxidase significantly increased the values of effective concentration causing 50 mycelial growth inhibition EC50 of azoxystrobin to both S sclerotiorum isolates whereas notably decreased the EC50 values of procymidone In mycelial respiration assay azoxystrobin displayed immediate inhibitory effect on cytochrome pathway capacity but had no immediate effect on alternative pathway capacity In contrast procymidone showed no immediate impact on capacities of both cytochrome and alternative pathways in the mycelia However alternative oxidase encoding gene aox transcript and protein levels alternative respiration pathway capacity of the mycelia were obviously increased by pretreatment for 24 h with both azoxystrobin and procymidone These results indicate that alternative oxidase was involved in the regulation of sensitivity of S sclerotiorum to the fungicides azoxystrobin and procymidone and that both fungicides could affect aox gene expression and the alternative respiration pathway capacity development in mycelia of this fungal pathogen

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