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Oxidative Schutzmechanismen und Resistenz gegenüber dem Dicarboximid‐Fungizid Iprodione in Alternaria alternata
Author(s) -
Steel C. C.,
Nair N. G.
Publication year - 1995
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1995.tb00658.x
Subject(s) - iprodione , alternaria alternata , superoxide dismutase , glutathione reductase , catalase , biology , fungicide , biochemistry , antioxidant , glutathione peroxidase , botany
The free radical scavengers α‐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‐1.24.‐triazole, a specific inhibitor of catalas, 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 appeats to be at least partially mediated by enhanced activitiesof, catalase.