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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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) |
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auxin crop competition dose-response herbicide resistance integrated weed management interspecific competition Agriculture S |
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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 |
work_keys_str_mv |
AT charlesmgeddes wheatdensityaltersbutdoesnotrepresstheexpressionofafluroxypyrresistantkochiaibassiascopariaiphenotype AT michaeltkimmins wheatdensityaltersbutdoesnotrepresstheexpressionofafluroxypyrresistantkochiaibassiascopariaiphenotype |
_version_ |
1718413341851910144 |