First Case of Glyphosate Resistance in Bromus catharticus Vahl.: Examination of Endowing Resistance Mechanisms.
| Autor: | Yanniccari M; National Scientific and Technical Research Council, Buenos Aires, Argentina.; Chacra Experimental Integrada Barrow, MDA-INTA, Tres Arroyos, Argentina., Vázquez-García JG; Department of Agricultural Chemistry and Edaphology, University of Cordoba, Cordoba, Spain., Gómez-Lobato ME; National Scientific and Technical Research Council, Buenos Aires, Argentina.; Plant Physiology Institute (INFIVE), National University of La Plata, La Plata, Argentina., Rojano-Delgado AM; Department of Agricultural Chemistry and Edaphology, University of Cordoba, Cordoba, Spain., Alves PLDCA; School of Agricultural and Veterinarian Sciences, Sâo Paulo State University (Unesp), Jaboticabal, Brazil., De Prado R; Department of Agricultural Chemistry and Edaphology, University of Cordoba, Cordoba, Spain. |
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| Jazyk: | angličtina |
| Zdroj: | Frontiers in plant science [Front Plant Sci] 2021 Feb 18; Vol. 12, pp. 617945. Date of Electronic Publication: 2021 Feb 18 (Print Publication: 2021). |
| DOI: | 10.3389/fpls.2021.617945 |
| Abstrakt: | Bromus catharticus Vahl. has been used as a valuable forage crop, but it has also been noted as a weed of winter crops and an invader in several countries. In Argentina, a putative glyphosate-resistant population of B. catharticus was identified as a consequence of the lack of effective control with glyphosate in the pre-sowing of wheat. Plant survival and shikimate accumulation analysis demonstrated a lower glyphosate-sensitivity of this population in comparison to a susceptible B. catharticus population. The resistant population was 4-fold more resistant to glyphosate than its susceptible counterpart. There was no evidence of target-site mechanisms of glyphosate resistance or an enhanced capacity to metabolize glyphosate in the resistant population. However, the resistant plants showed a lower foliar retention of glyphosate (138.34 μl solution g -1 dry weight vs. 390.79 μl solution g -1 dry weight), a reduced absorption of 14 C-glyphosate (54.18 vs. 73.56%) and lower translocation of 14 C-glyphosate from the labeled leaf (27.70 vs. 62.36%). As a result, susceptible plants accumulated a 4.1-fold higher concentration of 14 C-glyphosate in the roots compared to resistant plants. The current work describes the first worldwide case of glyphosate resistance in B. catharticus . A reduced foliar retention of herbicide, a differential rate of glyphosate entry into leaves and an altered glyphosate translocation pattern would be the most likely mechanisms of glyphosate exclusion. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. The handling editor declared a shared affiliation with several of the authors, MY and MG-L, at the time of the review. (Copyright © 2021 Yanniccari, Vázquez-García, Gómez-Lobato, Rojano-Delgado, Alves and De Prado.) |
| Databáze: | MEDLINE |
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