Low glyphosate doses change reproduction and produce tolerant offspring in dense populations of Hordeum vulgare

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Belz , R G & Sinkkonen , A 2021 , ' Low glyphosate doses change reproduction and produce tolerant offspring in dense populations of Hordeum vulgare ' , Pest Management Science , vol. 77 , no. 10 , pp. 4770-4784 . https://doi.org/10.1002/ps.6522

Title: Low glyphosate doses change reproduction and produce tolerant offspring in dense populations of Hordeum vulgare
Author: Belz, Regina G.; Sinkkonen, Aki
Contributor: University of Helsinki, Ecosystems and Environment Research Programme
Date: 2021-10
Language: eng
Number of pages: 15
Belongs to series: Pest Management Science
ISSN: 1526-498X
URI: http://hdl.handle.net/10138/334198
Abstract: BACKGROUND Low toxin doses that do not affect mean responses in plant populations can still change the growth of subpopulations. Studies covering vegetative stages ascribed fast-growing plants higher thresholds for growth stimulation and inhibition, compared with the rest of the population. We hypothesized that such selective effects also play a role after reproduction; that is, the offspring of glyphosate-treated tolerant, fast-growing phenotypes is more tolerant than the offspring of untreated plants. An experimental, high-density barley population was exposed to a range of glyphosate concentrations in the greenhouse, and reproduction and final growth were analyzed for selective effects. Therefore, F0, F1 treated and F1 non-treated offspring were re-exposed to glyphosate. RESULTS Low doses of glyphosate inhibited the growth and reproduction of slow-growing plants at concentrations that did not change the population mean. Concentrations that inhibited average-sized plants hormetically increased the biomass and seed yield of fast-growing plants. Compared with F0 and F1 non-treated offspring, F1-treated offspring from hormetically stimulated fast-growing plants were more glyphosate tolerant. Hence, a pesticide can shape the reproductive pattern of a plant population and alter offspring tolerance at concentrations that have no effect on average yield. CONCLUSIONS Toxin levels that do not change the population mean still alter the reproductive output of individuals. Sensitive phenotypes suffer, whereas the reproduction of tolerant phenotypes is boosted compared with toxin-free conditions. Because glyphosate is one of the leading herbicides in the world, tolerant phenotypes may benefit from current agricultural practices. If these results apply to other toxicants, low toxin doses may increase the fitness of tolerant phenotypes in a way not previously anticipated.
Subject: hormesis
dose-response
low toxin doses
selective toxicity
size inequality
herbicide resistance
SIZE DISTRIBUTION
COPPER-SULFATE
SPRAY DRIFT
HORMESIS
GROWTH
HERBICIDES
STIMULATION
TOXICOLOGY
RESPONSES
SEEDLINGS
1181 Ecology, evolutionary biology
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