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dc.contributor.authorPalma-Bautista, Candelario
dc.contributor.authorRojano-Delgado, Antonia M.
dc.contributor.authorDellaferrera, Ignacio
dc.contributor.authorRosario, Jesús
dc.contributor.authorVigna, Mario R.
dc.contributor.authorTorra Farré, Joel
dc.contributor.authorPrado, Rafael de
dc.description.abstract2,4-D resistance is increasing around the world due to both transgenic crops and resistance to other herbicides. The objective of the this study was to characterize the currently unknown mechanisms of 2,4-D resistance in five weed species from around the globe: Amaranthus hybridus (Argentina), Conyza canadensis (Hungary), Conyza sumatrensis (France), Hirschfeldia incana (Argentina) and Parthenium hysterophorus (Dominican Republic), using Papaver rhoeas (Spain) as a standard resistant (R) species. Dose-response trials using malathion and absorption, translocation and metabolism experiments were performed to unravel the resistance mechanisms. R plants produced at least 3-folds less ethylene than susceptible plants, confirming the resistance to 2,4-D, together with resistance factors >4. A. hybridus, P. hysterophorus and P. rhoeas showed both reduced translocation and enhanced metabolism. In the two Conyza sps., the only resistance mechanism found was enhanced metabolism. Malathion synergized with 2,4-D in all these species, indicating the role of cytochrome P450 in the herbicide degradation. In H. incana, reduced translocation was the only contributing mechanism to resistance. Among the six dicotyledonous weed species investigated, there was a differential contribution to 2,4-D resistance of enhanced metabolism and reduced translocation. Thus, extrapolating 2,4-D resistance mechanisms from one weed species to another is very risky, if even related.
dc.description.sponsorshipThis work was funded by Spanish Government through the project AGL2016-78944-R. A small part of the research undertaken at the University of Lleida-Agrotecnio for P. rhoeas populations has been supported by the Spanish Government, through project AGL2017-83325-C4-2-R (AEI/FEDER/UE).
dc.relation.isformatofReproducció del document publicat a:
dc.relation.ispartofAgronomy, 2020, vol. 10, num. 4, article number 566, p. 1-11
dc.rightscc-by (c) Palma-Bautista, Candelario et al., 2020
dc.subjectAmaranthus hybridus
dc.subjectEnhanced metabolism
dc.subjectHirschfeldia incana
dc.subjectPapaver rhoeas
dc.subjectParthenium hysterophorus
dc.subjectReduced translocation
dc.titleResistance mechanisms to 2,4-D in six different dicotyledonous weeds around the world

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cc-by (c) Palma-Bautista, Candelario et al., 2020
Except where otherwise noted, this item's license is described as cc-by (c) Palma-Bautista, Candelario et al., 2020