Identification of Triazine-Resistant Vulpia bromoides
In Australia, triazine herbicides have routinely controlled the Vulpia species (Vulpia bromoides, Vulpia myuros, and Vulpia fasciculata; collectively referred to as silvergrass). However, a simazine-resistant silvergrass biotype, collected from Pingelly in the Western Australian grain belt in 2014,...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
Weeds Science Society of America
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/42159 |
| _version_ | 1848756343262937088 |
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| author | Ashworth, Michael Han, H. Knell, G. Powles, S. |
| author_facet | Ashworth, Michael Han, H. Knell, G. Powles, S. |
| author_sort | Ashworth, Michael |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | In Australia, triazine herbicides have routinely controlled the Vulpia species (Vulpia bromoides, Vulpia myuros, and Vulpia fasciculata; collectively referred to as silvergrass). However, a simazine-resistant silvergrass biotype, collected from Pingelly in the Western Australian grain belt in 2014, has been confirmed. Compared to the pooled mortality of three simazine-susceptible silvergrass populations (S1, S2, and S3), the simazine-resistant Pingelly population was > 594-fold resistant at the LD50 level. Dose-response screening of the simazine-selected progeny (> 800 g ai simazine ha−1) demonstrated that the simazine resistance mechanism was heritable. Sequencing of the chloroplast psbA gene revealed the resistant population is homozygous for a serine 264 to glycine mutation, which confers a high-level triazine resistance. As expected this Ser-264-Gly mutation conferred resistance to atrazine and metribuzin, but not the phenyl-urea diuron. This is the first published report confirming field-evolved triazine resistance in a Vulpia population. |
| first_indexed | 2025-11-14T09:10:41Z |
| format | Journal Article |
| id | curtin-20.500.11937-42159 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:10:41Z |
| publishDate | 2016 |
| publisher | Weeds Science Society of America |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-421592017-09-13T14:23:34Z Identification of Triazine-Resistant Vulpia bromoides Ashworth, Michael Han, H. Knell, G. Powles, S. In Australia, triazine herbicides have routinely controlled the Vulpia species (Vulpia bromoides, Vulpia myuros, and Vulpia fasciculata; collectively referred to as silvergrass). However, a simazine-resistant silvergrass biotype, collected from Pingelly in the Western Australian grain belt in 2014, has been confirmed. Compared to the pooled mortality of three simazine-susceptible silvergrass populations (S1, S2, and S3), the simazine-resistant Pingelly population was > 594-fold resistant at the LD50 level. Dose-response screening of the simazine-selected progeny (> 800 g ai simazine ha−1) demonstrated that the simazine resistance mechanism was heritable. Sequencing of the chloroplast psbA gene revealed the resistant population is homozygous for a serine 264 to glycine mutation, which confers a high-level triazine resistance. As expected this Ser-264-Gly mutation conferred resistance to atrazine and metribuzin, but not the phenyl-urea diuron. This is the first published report confirming field-evolved triazine resistance in a Vulpia population. 2016 Journal Article http://hdl.handle.net/20.500.11937/42159 10.1614/WT-D-15-00127.1 Weeds Science Society of America restricted |
| spellingShingle | Ashworth, Michael Han, H. Knell, G. Powles, S. Identification of Triazine-Resistant Vulpia bromoides |
| title | Identification of Triazine-Resistant Vulpia bromoides |
| title_full | Identification of Triazine-Resistant Vulpia bromoides |
| title_fullStr | Identification of Triazine-Resistant Vulpia bromoides |
| title_full_unstemmed | Identification of Triazine-Resistant Vulpia bromoides |
| title_short | Identification of Triazine-Resistant Vulpia bromoides |
| title_sort | identification of triazine-resistant vulpia bromoides |
| url | http://hdl.handle.net/20.500.11937/42159 |