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Resistance of Venturia inaequalis to the sterol biosynthesis-inhibiting fungicide, penconazole [1-(2-(2,4-dichlorophenyl)pentyl)-1H-1,2,4-triazole]

Published online by Cambridge University Press:  01 September 1999

P. VIJAYA PALANI  and
D. LALITHAKUMARI
P. VIJAYA PALANI
Affiliation:
Centre for Advanced Study in Botany, University of Madras, Guindy Campus, Madras – 600 025, India
D. LALITHAKUMARI
Affiliation:
Centre for Advanced Study in Botany, University of Madras, Guindy Campus, Madras – 600 025, India
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Abstract

The likelihood of development of penconazole resistance in Venturia inaequalis was demonstrated using chemical mutagenesis of a wild isolate of the pathogen not previously exposed to penconazole. Mutant strains displayed a high degree of resistance which was stable. There was significant variation in the rate of total lipid and ergosterol biosyntheses between the resistant and sensitive strains. Low uptake of penconazole due to energy-dependent efflux was found to be the mechanism underlying penconazole resistance in the mutant strains, which also exhibited negatively correlated cross-resistance to mancozeb.

Type
Research Article
Information
Mycological Research , Volume 103 , Issue 9 , September 1999 , pp. 1157 - 1164
Copyright
© The British Mycological Society 1999

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