Journal
LETTERS IN APPLIED MICROBIOLOGY
Volume 63, Issue 4, Pages 268-273Publisher
WILEY
DOI: 10.1111/lam.12613
Keywords
carboxylic acid amides; cellulose synthase; G1105S; grape downy mildew; -PCR-RFLP; point mutation
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The objective of this work was to study the sensitivity to mandipropamid of 33 Plasmopara viticola populations utilizing both molecular and biological techniques. The PCR-RFLP technique was developed in order to detect the single point mutation, G1105S, occurring on the PvCesA3 gene. The sensitivity was also studied using the leaf-disc bioassay. Thirty-three downy mildew-infected leaf samples, collected from 2010 to 2013 from Italian vineyards, were used in the study. PCR-RFLP revealed the presence of 7 resistant, 12 sensitive, 14 mixed (sensitive and resistant) mutation profiles. Effective concentration for 50% inhibition rate (EC50) calculated from the bioassays showed an EC50 <1 mg l(-1) for samples that showed sensitive profiles, while for those samples that had a mixed profile, EC50 ranged from <1 to >300 mg l(-1), and values for resistant profiles ranged from 200.28 to >300 mg l(-1). The results suggest that P. viticola populations infecting Italian vineyards are under a selection pressure due to CAA-based fungicide applications.
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