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Genetics of sexual compatibility and resistance to benzimidazole and dicarboximide fungicides in isolates of Botryotinia fuckeliana (Botrytis cinerea) from nine countries
Author(s) -
FARETRA F.,
POLLASTRO S.
Publication year - 1993
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1993.tb02933.x
Subject(s) - biology , botrytis cinerea , mating type , heterothallic , fungicide , allele , genetics , botany , gene
Field isolates and laboratory mutants of Botryotinia fuckeliana (Botrytis cinerea) from nine different countries were crossed with reference strains of known mating type, to determine the genetic bases of differences in sexual fertility and in resistance to benzimidazole and dicarboximide fungicides. Most isolates were heterothallic, and carried the MAT1‐1 or MAT1‐2 mating‐type allele. A few isolates were fertile with strains of opposite mating types, due to the presence of both mating‐type alleles in heterokaryotic mycelia. The MAT1‐1 and MAT1‐2 alleles were fairly evenly distributed among the field isolates from most countries. Seventy‐six isolates displayed resistance to benzimidazole and/or dicarboximide fungicides due to mutant alleles of the Mbc1 and/or Daf1 genes. Unlike wild‐type and low‐resistant isolates, those carrying the high‐resistance Mbc/HR alleles were sensitive to N ‐phenylcarbamates. With one exception, isolates carrying the high‐resistance Daf/HR alleles were hypersensitive to media of high osmolarity. Heterokaryons containing Daf/HR alleles together with sensitive Daf/S or low‐resistance Daf/LR alleles in separate nuclei combined high resistance to dicarboximides with relative tolerance of media with high osmolarity.