To assess the potential risk of resistance development in Aspergillus flavus to pyrimethanil, five highly
pyrimethanil-resistant (PyrR) mutants (RF > 996.2) were obtained after UV-mutagenesis and tested for
fitness parameters and aflatoxin B1 production. All five mutant strains had mycelial growth rate, sporulation
and aflatoxin production similar to or even higher than the wild-type parent strain, which
indicated that pyrimethanil possesses a high risk in the development of resistance in A. flavus. Comparing
the sequences of four key enzymes cystathionine b-lyase (CBL), cystathionine g-synthase (CGS),
methionine sulfoxide reductase (MsrB), and sulfate permease (SP2) involved in the biosynthesis and
metabolism of methionine and sulfate assimilation revealed that no amino acid difference was found
between the mutant and wild-type parent strains, suggesting that the four enzymes might not be related
to the anilinopyrimidines (APs) resistance in A. flavus.
To assess the potential risk of resistance development in Aspergillus flavus to pyrimethanil, five highly
pyrimethanil-resistant (PyrR) mutants (RF > 996.2) were obtained after UV-mutagenesis and tested for
fitness parameters and aflatoxin B1 production. All five mutant strains had mycelial growth rate, sporulation
and aflatoxin production similar to or even higher than the wild-type parent strain, which
indicated that pyrimethanil possesses a high risk in the development of resistance in A. flavus. Comparing
the sequences of four key enzymes cystathionine b-lyase (CBL), cystathionine g-synthase (CGS),
methionine sulfoxide reductase (MsrB), and sulfate permease (SP2) involved in the biosynthesis and
metabolism of methionine and sulfate assimilation revealed that no amino acid difference was found
between the mutant and wild-type parent strains, suggesting that the four enzymes might not be related
to the anilinopyrimidines (APs) resistance in A. flavus.
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