Wheat Density Alters but Does Not Repress the Expression of a Fluroxypyr-Resistant Kochia (<i>Bassia scoparia</i>) Phenotype

Dose-response experiments for confirmation of herbicide-resistant weeds are almost always conducted using weed monocultures, thereby ignoring the interaction of interspecific plant interference with herbicide efficacy. Controlled-environment dose-response bioassays were conducted using three kochia...

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Autores principales: Charles M. Geddes, Michael T. Kimmins
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Publicado: MDPI AG 2021
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spelling oai:doaj.org-article:cb2c938f40ae4786af63585ad7e79cdb2021-11-25T16:04:43ZWheat Density Alters but Does Not Repress the Expression of a Fluroxypyr-Resistant Kochia (<i>Bassia scoparia</i>) Phenotype10.3390/agronomy111121602073-4395https://doaj.org/article/cb2c938f40ae4786af63585ad7e79cdb2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4395/11/11/2160https://doaj.org/toc/2073-4395Dose-response experiments for confirmation of herbicide-resistant weeds are almost always conducted using weed monocultures, thereby ignoring the interaction of interspecific plant interference with herbicide efficacy. Controlled-environment dose-response bioassays were conducted using three kochia [<i>Bassia scoparia</i> (L.) A.J. Scott] populations with four spring wheat (<i>Triticum aestivum</i> L.) densities (0, 200, 400, and 600 plants m<sup>−2</sup>) to determine how increasing intensity of interspecific plant interference altered the fluroxypyr dose-response relationship of resistant and susceptible kochia. The resistant population exhibited 10.8-, 15.0-, 7.0-, and 8.1-fold resistance to fluroxypyr in the absence of crop interference based on plant survival, biomass fresh weight, and visible control at two and four weeks after application, respectively. Increased wheat densities suppressed fluroxypyr-resistant kochia the greatest, resulting in a linear reduction in the fluroxypyr rate causing 50% plant mortality (LD<sub>50</sub>) and visible control (ED<sub>50</sub>) for the resistant but not the susceptible populations. This reduced the expression of fluroxypyr resistance based on kochia plant survival (from 10.8- to 4.3-fold resistance) and visible control (from 8.1- to 4.6-fold resistance) as wheat density increased from 0 to 600 plants m<sup>−2</sup>. Therefore, enhanced interspecific plant interference caused by increased wheat densities altered but did not repress the expression of fluroxypyr resistance in kochia.Charles M. GeddesMichael T. KimminsMDPI AGarticleauxincrop competitiondose-responseherbicide resistanceintegrated weed managementinterspecific competitionAgricultureSENAgronomy, Vol 11, Iss 2160, p 2160 (2021)
institution DOAJ
collection DOAJ
language EN
topic auxin
crop competition
dose-response
herbicide resistance
integrated weed management
interspecific competition
Agriculture
S
spellingShingle auxin
crop competition
dose-response
herbicide resistance
integrated weed management
interspecific competition
Agriculture
S
Charles M. Geddes
Michael T. Kimmins
Wheat Density Alters but Does Not Repress the Expression of a Fluroxypyr-Resistant Kochia (<i>Bassia scoparia</i>) Phenotype
description Dose-response experiments for confirmation of herbicide-resistant weeds are almost always conducted using weed monocultures, thereby ignoring the interaction of interspecific plant interference with herbicide efficacy. Controlled-environment dose-response bioassays were conducted using three kochia [<i>Bassia scoparia</i> (L.) A.J. Scott] populations with four spring wheat (<i>Triticum aestivum</i> L.) densities (0, 200, 400, and 600 plants m<sup>−2</sup>) to determine how increasing intensity of interspecific plant interference altered the fluroxypyr dose-response relationship of resistant and susceptible kochia. The resistant population exhibited 10.8-, 15.0-, 7.0-, and 8.1-fold resistance to fluroxypyr in the absence of crop interference based on plant survival, biomass fresh weight, and visible control at two and four weeks after application, respectively. Increased wheat densities suppressed fluroxypyr-resistant kochia the greatest, resulting in a linear reduction in the fluroxypyr rate causing 50% plant mortality (LD<sub>50</sub>) and visible control (ED<sub>50</sub>) for the resistant but not the susceptible populations. This reduced the expression of fluroxypyr resistance based on kochia plant survival (from 10.8- to 4.3-fold resistance) and visible control (from 8.1- to 4.6-fold resistance) as wheat density increased from 0 to 600 plants m<sup>−2</sup>. Therefore, enhanced interspecific plant interference caused by increased wheat densities altered but did not repress the expression of fluroxypyr resistance in kochia.
format article
author Charles M. Geddes
Michael T. Kimmins
author_facet Charles M. Geddes
Michael T. Kimmins
author_sort Charles M. Geddes
title Wheat Density Alters but Does Not Repress the Expression of a Fluroxypyr-Resistant Kochia (<i>Bassia scoparia</i>) Phenotype
title_short Wheat Density Alters but Does Not Repress the Expression of a Fluroxypyr-Resistant Kochia (<i>Bassia scoparia</i>) Phenotype
title_full Wheat Density Alters but Does Not Repress the Expression of a Fluroxypyr-Resistant Kochia (<i>Bassia scoparia</i>) Phenotype
title_fullStr Wheat Density Alters but Does Not Repress the Expression of a Fluroxypyr-Resistant Kochia (<i>Bassia scoparia</i>) Phenotype
title_full_unstemmed Wheat Density Alters but Does Not Repress the Expression of a Fluroxypyr-Resistant Kochia (<i>Bassia scoparia</i>) Phenotype
title_sort wheat density alters but does not repress the expression of a fluroxypyr-resistant kochia (<i>bassia scoparia</i>) phenotype
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/cb2c938f40ae4786af63585ad7e79cdb
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AT michaeltkimmins wheatdensityaltersbutdoesnotrepresstheexpressionofafluroxypyrresistantkochiaibassiascopariaiphenotype
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