RT Journal Article
T1 The First Case of Glyphosate Resistance in Johnsongrass (Sorghum halepense (L.) Pers.) in Europe
A1 Vázquez García, Jose G.
A1 Palma Bautista, Candelario
A1 Rojano Delgado, Antonia María
A1 De Prado, Rafael
A1 Menéndez Calle, Julio
AB Six Johnsongrass populations suspected of being glyphosate resistant were collected fromrailways and freeways near Cordoba (SW Spain), where glyphosate is the main weed control tool.The 50% reduction in shoot fresh weight (GR50) values obtained for these six populations rangedfrom 550.4 to 1169 g ae ha-1, which were 4.2 to 9 times greater than the value obtained for thesusceptible population. Glyphosate was equally metabolized to the same extent in both resistant andsusceptible populations, with no significant di erences in either 5-enolpyruvylshikimate-3-phosphatesynthase (EPSPS) inhibition or basal activity. No amino acid substitutions were observed in any ofthe resistant populations. Slight but significant differences in glyphosate penetration were observedamong some but not all of the resistant populations and for the times of incubation assayed, althoughthese differences were not considered further. The proposed primary mechanism of resistance inthese six glyphosate-resistant Johnsongrass populations is reduced herbicide translocation, becausethe amount of glyphosate that translocated from treated leaves to shoots and roots in the susceptiblepopulation was double that observed in the resistant populations. As glyphosate multiple resistancedue to more than one mechanism is not uncommon, this is the first time that glyphosate-resistantJohnsongrass populations have been fully described for all known mechanisms.
PB MDPI
SN 2223-7747
YR 2020
FD 2020-03
LK http://hdl.handle.net/10272/17997
UL http://hdl.handle.net/10272/17997
LA eng
NO Vázquez García, J. G., Palma Bautista, C., Rojano Delgado, A. M., De Prado, R.,   Menéndez Calle, J. (2020). The First Case of Glyphosate Resistance in Johnsongrass (Sorghum halepense (L.) Pers.) in Europe. Plants, 9(3), 313. DOI: https://doi.org/10.3390/plants9030313
NO This research was funded by the Spanish Ministry of Economy and Competitiveness (AGL2016-78944-R)and the Asociación de Agroquímicos y Medioambiente.
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026