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- Title
Monitoring and characterization of resistance development of strawberry Phomopsis leaf blight to fungicides.
- Authors
Shi, Haojie; Wu, Huiming; Zhang, Chuanqing; Shen, Xin
- Abstract
From 2005 to 2009, a total of 479 single-conidial isolates of Phomopsis obscurans were collected from strawberry. The isolates were characterized for their resistance to benzimidazole fungicides, diethofencarb, and sterol demethylation inhibitors (DMIs). Low-level DMI resistant isolates (DMI-LR) and two types of benzimidazole-resistant (Ben R) isolates, Ben R1 (benzimidazole-resistant and diethofencarb -sensitive) and Ben R2 (benzimidazole-resistant and diethofencarb -resistant), were detected. Both Ben R and DMI-LR isolates exhibited comparable growth, sporulation, and pathogenicity with the sensitive isolates. No significant difference in growth at low temperature was observed between Ben R and benzimidazole-sensitive (Ben S) isolates. Ben R1 was caused by a point mutation from GAG to GTG at codon 198 in the β-tubulin gene in Ben S isolates, predicted to cause a change from glutamic acid to valine. Ben R2 was induced by a point mutation from TTC to TAC at codon 200 in the β-tubulin gene in Ben S isolates.
- Subjects
PHOMOPSIS; PHOMOPSIS diseases; BLIGHT diseases (Botany); STRAWBERRY diseases &; pests; PHYSIOLOGICAL effects of fungicides; CHEMICAL synthesis; BENZIMIDAZOLES
- Publication
European Journal of Plant Pathology, 2013, Vol 135, Issue 4, p655
- ISSN
0929-1873
- Publication type
Article
- DOI
10.1007/s10658-012-0102-6