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PPO2 Mutations in Amaranthus palmeri: Implications on Cross-Resistance
| Content Provider | MDPI |
|---|---|
| Author | Carvalho-Moore, Pâmela Rangani, Gulab Heiser, James Findley, Douglas Bowe, Steven J. Roma-Burgos, Nilda |
| Copyright Year | 2021 |
| Description | In Arkansas, resistance to protoporphyrinogen IX oxidase (PPO)-inhibiting herbicides in Amaranthus palmeri S. Wats. is mainly due to target site mutations. Although A. palmeri PPO-mutations are well investigated, the cross-resistance that each ppo mutant endows to weed populations is not yet well understood. We aimed to evaluate the response of PPO-resistant A. palmeri accessions, harboring the ppo2 mutations ΔG210 and G399A, to multiple PPO-inhibiting herbicides. Six resistant and one susceptible field accessions were subjected to a dose–response assay with fomesafen, and selected survivors from different fomesafen doses were genotyped to characterize the mutation profile. The level of resistance to fomesafen was determined and a cross-resistance assay was conducted with 1 and 2 times the labeled doses of selected PPO herbicides. The accession with higher predicted dose to control 50% of the population (ED50) had a higher frequency of ΔG210-homozygous survivors. Survivors harboring both mutations, and those that were ΔG210-homozygous, incurred less injury at the highest fomesafen rate tested (1120 g ai $ha^{−1}$). The populations with a high frequency of ΔG210-homozygous survivors, and those with individuals harboring ΔG210 + G399A mutations, exhibited high potential for cross-resistance to other PPO herbicides. The new PPO–herbicide chemistries (saflufenacil, trifludimoxazin) generally controlled the PPO-resistant populations. |
| Starting Page | 760 |
| e-ISSN | 20770472 |
| DOI | 10.3390/agriculture11080760 |
| Journal | Agriculture |
| Issue Number | 8 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-08-10 |
| Access Restriction | Open |
| Subject Keyword | Agriculture Horticulture Amaranthus Palmeri Protoporphyrinogen Ix Oxidase (ppo) Herbicide Resistance Target-site Resistance |
| Content Type | Text |
| Resource Type | Article |
