1887

Abstract

The use of CYC 1106 killer toxin against was investigated. This strain exerted a broad-specificity killing action against other yeasts and fungi. At pH 4, optimal killer activity was observed at temperatures up to 20 °C. At 25 °C the toxic effect was reduced to 70 %. The killer activity was higher in acidic medium. Above about pH 4·5 activity decreased sharply and was barely noticeable at pH 6. The killer toxin protein from CYC 1106 was purified to electrophoretic homogeneity. SDS-PAGE of the purified killer protein indicated an apparent molecular mass of 18 kDa. Killer toxin production was stimulated in the presence of non-ionic detergents. The toxin concentrations present in the supernatant during optimal production conditions exerted a fungicidal effect on a strain of . The symptoms of infection and grey mould observed in plants treated with were prevented in the presence of purified killer toxin. The results obtained suggest that CYC 1106 killer toxin is of potential use in the biocontrol of .

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2004-08-01
2019-10-15
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