Characterization of the genetic variation and fungicide resistance in Botrytis cinerea populations on rooibos seedlings in the Western Cape of South Africa

2013 ◽  
Vol 136 (2) ◽  
pp. 407-417 ◽  
Author(s):  
Bernard A. Wessels ◽  
Sandra C. Lamprecht ◽  
Celeste C. Linde ◽  
Paul H. Fourie ◽  
Lizel Mostert
Keyword(s):  
South Africa ◽  
Genetic Variation ◽  
Botrytis Cinerea ◽  
Fungicide Resistance ◽  
Western Cape

scholarly journals Characterization of the Field Fludioxonil Resistance and Its Molecular Basis in Botrytis cinerea from Shanghai Province in China

2021 ◽  
Vol 9 (2) ◽  
pp. 266
Author(s):  
Weizhen Wang ◽  
Yuan Fang ◽  
Muhammad Imran ◽  
Zhihong Hu ◽  
Sicong Zhang ◽  
...  
Keyword(s):  
Amino Acid ◽  
Botrytis Cinerea ◽  
Fungicide Resistance ◽  
Molecular Basis ◽  
Resistance Mechanisms ◽  
Gray Mold ◽  
Amino Acid Sequences ◽  
Necrotrophic Pathogen ◽  
Moderate Resistance

Botrytis cinerea is a destructive necrotrophic pathogen that can infect many plant species. The control of gray mold mainly relies on the application of fungicides, and the fungicide fludioxonil is widely used in China. However, the field fungicide resistance of B. cinerea to this compound is largely unknown. In this study, B. cinerea isolates were collected from different districts of Shanghai province in 2015–2017, and their sensitivity to fludioxonil was determined. A total of 65 out of 187 field isolates (34.76%) were found to be resistant to fludioxonil, with 36 (19.25%) showing high resistance and 29 (15.51%) showing moderate resistance. Most of these resistant isolates also showed resistance to iprodione, and some developed resistance to fungicides of other modes of action. AtrB gene expression, an indicator of MDR1 and MDR1h phenotypes, was not dramatically increased in the tested resistant isolates. Biological characteristics and osmotic sensitivity investigations showed that the fitness of resistant isolates was lower than that of sensitive ones. To investigate the molecular resistance mechanisms of B. cinerea to fludioxonil, the Bos1 amino acid sequences were compared between resistant and sensitive isolates. Resistant isolates revealed either no amino acid variations or the mutations I365S, I365N, Q369P/N373S, and N373S.

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