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Gomphrena perennis is a weed with C4 metabolism, with a root system that is be able to resprout, all characteristics that turn this plant problematic to control, especially during summer cropping. Large productive areas of Argentina have been recording infestations with glyphosate-tolerant G. perennis. The aim of the thesis were to characterize morphoanatomically leaves of G. perennis coming from Banderas, Santiago del Estero (Lat.28°28'00"S; Long.62°06'00"W) and Marcos Juarez, Cordoba (Lat.32°41'00"S; Long.62°09'00"W) ) – both important extensive agricultural areas in this country and determine whether structures present in the epidermis could behave as mechanical barriers to uptake and subsequent herbicide transport, quantified by the accumulation of shikimic acid (AS) and others metabolic parameters. Seeds of both origin were sown and cultivated in greenhouse (INFIVE) and open-field conditions. When plants reached 4 expanded leaves, different doses of glyphosate were applied (0; 180; 360; 720, 1440, 2880 and 5760 g.e.a/Ma). The content of AS was evaluated in roots (R), basal leaves (HB) and apical leaves (HA). Seven days after application (DPA) was determined photosynthesis net (PN), transpiration (E) and stomatal conductance (CS), in control plants (T) and in treated with the recommended dose (DR:1440 g.e.a/Ha). The survival (S) was recorded at 15 and 30DPA. The experimental design was randomized with three replicates, and the data were analyzed by means of Anova Test (p 0.01). The two populations were tolerant to glyphosate. Banderas showed a greater sensitivity to the DR of the herbicide when compared to that of Cordoba. G. perennis had low leaf area, wax epicuticulars, and more abundant trichomes. These characters reduce the effectiveness of

Caracterización morfo-anatómica de dos poblaciones de &lt;i&gt;Gomphrena perennis&lt;/i&gt; L y su posible relación con la sensibilidad al herbicida glifosato