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This work was funded by the Asociacion de Agroquimicos y Medioambiente and the Universidad Autonoma Chapingo.

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Non-Target Site Mechanisms Endow Resistance to Glyphosate in Saltmarsh Aster (Aster squamatus)

Publicat a:Plants-Basel. 10 (9): 1970- - 2021-09-01 10(9), DOI: 10.3390/plants10091970

Autors: Dominguez-Valenzuela, Jose Alfredo; de la Cruz, Ricardo; Palma-Bautista, Candelario; Vazquez-Garcia, Jose Guadalupe; Cruz-Hipolito, Hugo E; De Prado, Rafael

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Of the six-glyphosate resistant weed species reported in Mexico, five were found in citrus groves. Here, the glyphosate susceptibility level and resistance mechanisms were evaluated in saltmarsh aster (Aster squamatus), a weed that also occurs in Mexican citrus groves. The R population accumulated 4.5-fold less shikimic acid than S population. S plants hardly survived at 125 g ae ha(-1) while most of the R plants that were treated with 1000 g ae ha(-1), which suffered a strong growth arrest, showed a vigorous regrowth from the third week after treatment. Further, 5-enolpyruvylshikimate-3-phosphate basal and enzymatic activities did not diverge between populations, suggesting the absence of target-site resistance mechanisms. At 96 h after treatment, R plants absorbed similar to 18% less glyphosate and maintained 63% of the C-14-glyphsoate absorbed in the treated leaf in comparison to S plants. R plants metabolized twice as much (72%) glyphosate to amino methyl phosphonic acid and glyoxylate as the S plants. Three non-target mechanisms, reduced absorption and translocation and increased metabolism, confer glyphosate resistance saltmarsh aster. This is the first case of glyphosate resistance recorded for A. squamatus in the world.

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