AI Article Synopsis
- The study measured the sensitivity of 106 P. sojae isolates to ametoctradin, finding a unimodal distribution of effectiveness with an average EC value of 0.1743 μg/mL and showing that resistant mutants are less fit than wild types.
- Resistance to ametoctradin was linked to a specific S33L mutation in the PsCytb protein, and while no cross-resistance to other fungicides was found, a negative relationship with amisulbrom was noted, suggesting a complex interaction between these compounds due to changes
Article Abstract
Ametoctradin is mainly used to treat plant oomycetes diseases, but the mechanism and resistance risk of ametoctradin in Phytophthora sojae remain unknown. This study determined the ametoctradin sensitivity of 106 P. sojae isolates and found that the frequency distribution of the median effective concentration (EC) of ametoctradin was unimodal with a mean value of 0.1743 ± 0.0901 μg/mL. Furthermore, ametoctradin-resistant mutants had a substantially lower fitness index compared with that of wild-type isolates. Although ametoctradin did not show cross-resistance to other fungicides, negative cross-resistance to amisulbrom was found. In comparison to sensitive isolates, the control efficacy of ametoctradin to resistant mutants was lower, implying a low to moderate ametoctradin resistance risk in P. sojae. All ametoctradin-resistant mutants contained a S33L point mutation in PsCytb. A system with overexpression of PsCytb in the nucleus was established. When we ectopically overexpressed S33L-harboring PsCytb, P. sojae developed ametoctradin resistance. We hypothesized that the observed negative resistance between ametoctradin and amisulbrom could be attributed to conformational changes in the binding cavity of PsCytb at residues 33 and 220.
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| http://dx.doi.org/10.1016/j.pestbp.2023.105747 | DOI Listing |
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