Unravelling the resistance mechanisms to 2,4-D (2,4-dichlorophenoxyacetic acid) in corn poppy (Papaver rhoeas)

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2016-10Author
Rey Caballero, Jordi
Menéndez, Julio
Salas, Marisa
Alcántara, Ricardo
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Rey Caballero, Jordi;
Menéndez, Julio;
Giné Bordonaba, Jordi;
Salas, Marisa;
Alcántara, Ricardo;
Torra Farré, Joel;
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(2016)
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Unravelling the resistance mechanisms to 2,4-D (2,4-dichlorophenoxyacetic acid) in corn poppy (Papaver rhoeas).
Pesticide Biochemistry and Physiology, 2016, vol. 133, p. 67-72.
https://doi.org/10.1016/j.pestbp.2016.03.002.
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In southern Europe, the intensive use of 2,4-D (2,4-dichlorophenoxyacetic acid) and tribenuron-methyl in cereal crop systems has resulted in the evolution of resistant (R) corn poppy (Papaver rhoeas L.) biotypes. Experiments were conducted to elucidate (1) the resistance response to these two herbicides, (2) the cross-resistant pattern to other synthetic auxins and (3) the physiological basis of the auxin resistance in two R (F-R213 and D-R703) populations. R plants were resistant to both 2,4-D and tribenuron-methyl (F-R213) or just to 2,4-D (D-R703) and both R populations were also resistant to dicamba and aminopyralid. Results from absorption and translocation experiment revealed that R plants translocated less [14C]-2,4-D than S plants at all evaluation times. There was between four and eight-fold greater ethylene production in S plants treated with 2,4-D, than in R plants. Overall, these results suggest that reduced 2,4-D translocation is the resistance mechanism in synthetic auxins R corn poppy populations and this likely leads to less ethylene production and greater survival in R plants.
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Pesticide Biochemistry and Physiology, 2016, vol. 133, p. 67-72European research projects
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