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Interpopulation variability and adaptive potential for reduced glyphosate sensitivity in Alopecurus myosuroides
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Davies, Laura R. and Neve, Paul (2017) Interpopulation variability and adaptive potential for reduced glyphosate sensitivity in Alopecurus myosuroides. Weed Research, 57 (5). pp. 323-332. doi:10.1111/wre.12264 ISSN 0043-1737.
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Official URL: https://doi.org/10.1111/wre.12264
Abstract
Glyphosate use in the United Kingdom has more than doubled in the last 20 years. Much of this increase is driven by efforts to control herbicide resistant weeds, particularly Alopecurus myosuroides, prior to crop drilling. There is precedent for evolution of glyphosate resistance in similar situations, raising concerns over the sustainability of glyphosate use in the UK. We used dose–response experiments to examine variation in glyphosate sensitivity amongst 40 field-collected A. myosuroides populations. No populations were resistant to glyphosate, but ED90 values ranged between 354 and 610 g a.i. ha−1. Five populations had ED90 values significantly higher than the unexposed control population collected from a site at Rothamsted Research with no previous glyphosate exposure. Recurrent selection experiments were performed to determine whether variation in glyphosate sensitivity had a heritable basis. Following two rounds of selection, five of six field populations evolved significantly reduced sensitivity to glyphosate, with R/S ratios, based on estimated ED50 values, ranging from 1.2 to 1.5. These results confirm that there is a heritable basis to variation in glyphosate sensitivity. The response to selection was modest. Evolved populations were not highly resistant to glyphosate, although some twice-selected individuals survived recommended field rates. These results do not represent definitive proof of the potential of A. myosuroides to evolve glyphosate resistance, although they do indicate caution is needed when considering the sustainability of increased glyphosate use to control this herbicide resistance-prone species.
| Item Type: | Journal Article | |||||||||
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| Subjects: | S Agriculture > SB Plant culture | |||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | |||||||||
| SWORD Depositor: | Library Publications Router | |||||||||
| Library of Congress Subject Headings (LCSH): | Glyphosate -- Great Britain, Herbicide-resistant crops | |||||||||
| Journal or Publication Title: | Weed Research | |||||||||
| Publisher: | Wiley-Blackwell Publishing Ltd. | |||||||||
| ISSN: | 0043-1737 | |||||||||
| Official Date: | October 2017 | |||||||||
| Dates: |
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| Volume: | 57 | |||||||||
| Number: | 5 | |||||||||
| Page Range: | pp. 323-332 | |||||||||
| DOI: | 10.1111/wre.12264 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Reuse Statement (publisher, data, author rights): | ** Embargo End Date: 10-08-2017 ** From Crossref via Jisc Publications Router. ** Licence for this article starting on 10-08-2017: http://creativecommons.org/licenses/by/4.0/ | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| Date of first compliant deposit: | 16 August 2017 | |||||||||
| Date of first compliant Open Access: | 17 August 2017 | |||||||||
| Funder: | Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC), Dow Agrosciences LLC | |||||||||
| Grant number: | BB/I016856/1 (BBSRC) | |||||||||
| RIOXX Funder/Project Grant: |
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