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Oxidative protective mechanisms and resistance to the dicarboximide fungicide, iprodione, in Alternaria alternata

, : Oxidative protective mechanisms and resistance to the dicarboximide fungicide, iprodione, in Alternaria alternata. Journal of Phytopathology (Berlin) 143(9): 531-535

The free radical scavengers alpha-tocopherol and butylated hydroxytoluene, but not ascorbate, diminished the growth-inhibiting effects of the dicarboximide fungicide, iprodione in Alternaria alternata. Growth of A. alternata in the presence of iprodione increased the activities of superoxide dismutase and glutathione reductase while catalase was unaffected. Four iprodione sensitive and four iprodione resistant isolates of A. alternata were compared for activity of free radical enzymes. The isolates of A. alternata resistant to iprodione had more catalase activity than those which were sensitive, but did not differ in superoxide dismutase of glutathione reductase activities. 3-Amino- 1,2,4,-triazole, a specific inhibitor of catalase, reduced the ability of DAR 69775, a dicarboximide resistant isolate of A. alternata, to grow in the presence of iprodione. In A. alternata dicarboximide resistance appears to be at least partially mediated by enhanced activities of catalase.

Accession: 002914127

DOI: 10.1111/j.1439-0434.1995.tb00658.x

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