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- Title
The role of plant size in the selection of glyphosate resistance in Sorghum halepense.
- Authors
Gundel, Pedro E; Vila‐Aiub, Martin; Casas, Cecilia
- Abstract
BACKGROUND: The effect of plant size (seedlings versus young plants versus adult plants) on the phenotypic level of glyphosate resistance and selection intensity (SI) in Sorghum halepense with and without a reduced glyphosate translocation resistance mechanism was evaluated. RESULTS: Resistance parameters [the 50% lethal dose (LD50) and the dose required to cause a 50% reduction in plant growth (GR50)] in adult plants were notably higher than in seedlings regardless of the resistance status. However, under similar plant size increases, populations comprised of glyphosate‐resistant (R) individuals showed higher survival and growth when glyphosate treated compared with glyphosate‐susceptible (S) plants. An increase in SI was always evident with increasing glyphosate doses. However, the rate of increase in SI was higher under glyphosate selection of young R and S plants, followed by seedlings and adult R and S plants. However, in conditions of R seedlings coexisting with adult S plants under glyphosate treatment (1000–4000 g ha−1), selection against glyphosate resistance was observed. CONCLUSION: Any increase in size from the seedling stage of R plants translates into an amplification of resistance. Depending on the particular size combinations of spatially coexisting R and S plants, selection for glyphosate resistance may be faster, slower or even not evident. © 2018 Society of Chemical Industry Depending on the particular size combination of spatially coexisting glyphosate‐resistant (R) and susceptible (S) plants, the intensity of glyphosate selection may increase or decrease under increasing glyphosate doses.
- Subjects
JOHNSON grass; GLYPHOSATE; HERBICIDE resistance; AGRICULTURAL ecology; WEED populations
- Publication
Pest Management Science, 2018, Vol 74, Issue 11, p2460
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.4923