Low toxin doses change plant size distribution in dense populations – Glyphosate exposed Hordeum vulgare as a greenhouse case study

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dc.contributor.author Belz, Regina G.
dc.contributor.author Sinkkonen, Aki
dc.date.accessioned 2020-01-17T08:42:01Z
dc.date.available 2020-01-17T08:42:01Z
dc.date.issued 2019-11
dc.identifier.citation Belz , R G & Sinkkonen , A 2019 , ' Low toxin doses change plant size distribution in dense populations – Glyphosate exposed Hordeum vulgare as a greenhouse case study ' , Environment International , vol. 132 , 105072 . https://doi.org/10.1016/j.envint.2019.105072
dc.identifier.other PURE: 126145617
dc.identifier.other PURE UUID: 89d70358-58c7-4ee8-8c2e-bf18fa387f17
dc.identifier.other RIS: urn:2987B7CAD2B9149AFA1C23807767E3DB
dc.identifier.other WOS: 000493552400035
dc.identifier.other ORCID: /0000-0002-6821-553X/work/68612776
dc.identifier.uri http://hdl.handle.net/10138/309698
dc.description.abstract Numerous intentionally released toxins persist in agricultural or natural environments at low concentrations. Such low toxin doses are regularly associated with hormesis, i.e., growth stimulation, and they are suspected to affect mortality and within-population plant size distribution in dense plant stands. However, it is not known whether all these low-dose effects exist when plants grow in soil. We exposed barley to a range of low glyphosate doses and let the plants grow in dense stands for several weeks in soil. Six experiments were done that contained altogether 10,260 seedlings in 572 pots. We evaluated if the changes in average biomass and shoot length occur at the same concentrations as do the effects on slow- and fast-growing individuals, if seed size or early vigor explains variation in the response to glyphosate, and if low toxin doses change within-population mortality. Plant biomass, length and survival of subpopulations changed at doses that did not affect mean biomass. Effects of early vigor faded early, but differences in seed size and particularly vegetative growth had impacts: fast-growing plants hardly showed hormesis, whereas hormesis was particularly strong among slow-growing individuals. Compared to the population mean, glyphosate effects started at lower doses among slow-growing individuals and at higher doses among fast-growing individuals. Several times higher doses were needed before the fast-growing individuals showed the same toxicity as most of the population. Low toxin doses regularly enhanced the growth of the smallest individuals, which reduced size variation within populations and was associated with a higher number of surviving plants. Indeed, in one experiment self-thinning was not observed at low doses that stimulated the growth of slow-growing plants. As glyphosate levels in this study match those observed in agricultural fields and natural environments, we conclude that even low-levels of agro-environmental contamination are likely to shape phenotypic response, which might lead to adaptation and cascading ecological impacts. en
dc.format.extent 12
dc.language.iso eng
dc.relation.ispartof Environment International
dc.rights cc_by_nc_nd
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject Hormesis
dc.subject Dose-response
dc.subject Low toxin doses
dc.subject Self-thinning
dc.subject Selective toxicity
dc.subject Size inequality
dc.subject 1172 Environmental sciences
dc.title Low toxin doses change plant size distribution in dense populations – Glyphosate exposed Hordeum vulgare as a greenhouse case study en
dc.type Article
dc.contributor.organization Nature-Based Solutions
dc.contributor.organization Aki Tapio Sinkkonen / Principal Investigator
dc.contributor.organization Ecosystems and Environment Research Programme
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1016/j.envint.2019.105072
dc.relation.issn 0160-4120
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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