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Target-site and non-target site resistance mechanisms are associated with iodosulfuron resistance in Lolium perenne L.
- Source :
-
New Zealand Journal of Agricultural Research . Feb2024, Vol. 67 Issue 1, p40-53. 14p. - Publication Year :
- 2024
-
Abstract
- Resistance to iodosulfuron, a herbicide targeting acetolactate synthase (ALS), was identified and characterised in a population of Lolium perenne L. from Canterbury, New Zealand. The resistant population was 264 times more resistant to iodosulfuron than a susceptible population, based on a ratio of the rate corresponding to a 50% reduction in resistant and susceptible plant survival (R/S LD50). The resistant population was also 14-times more resistant to nicosulfuron, another ALS-inhibitor of the same class. However, no resistance to imazapyr, an ALS-inhibitor from a different chemical class, was detected in the resistant population. Pre-treatment with an inhibitor of cytochrome P450 reduced the level of iodosulfuron resistance to 46-fold in the resistant population, suggesting enhanced herbicide metabolism, a non-target site mechanism, contributed to resistance of this herbicide. In addition, a proline to leucine substitution at codon 197 was detected, suggesting a target-site-based mechanism was also associated with resistance to iodosulfuron. This is the first report on the resistance mechanisms to ALS-inhibiting herbicides identified in Lolium perenne in New Zealand and highlights the importance of integrated weed management approaches to reduce the likelihood of ALS-inhibitor herbicide resistance becoming more widespread. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00288233
- Volume :
- 67
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- New Zealand Journal of Agricultural Research
- Publication Type :
- Academic Journal
- Accession number :
- 173778734
- Full Text :
- https://doi.org/10.1080/00288233.2022.2153875