PUBLICACIONES

Phytotoxic activity of root absorbed glyphosate in corn seedlings

J. Internacional: Phytotoxic activity of root absorbed glyphosate in corn seedlings

RODRIGO WAGNER B.

2003 - Weed Biology and Management - Volumen 3, Issue 4. Pp 228-232

Abstract

Growth chamber experiments were conducted in order to study the absorption, translocation and activity of glyphosate when applied to roots with aqueous solution avoiding any glyphosate–substrate interaction. Corn seedlings at the first leaf stage were set up in individual graduated cylinders containing different solutions of 14C‐glyphosate (0–30 mg ae kg−1). After 26 h of root exposure, plants were transferred to fresh nutrient solution and grown for the next 5 days. After harvest, plants were separated into seed, root, mesocotyle, coleoptile, cotyledon, first leaf and all new leaves (apex), and quantified 14C radioactivity contained in each part. Glyphosate uptake was only 11% of the theoretical mass flow into the plant. The amount of glyphosate translocated from roots was positively correlated with plant uptake (P < 0.01). Total plant fresh weight presented a logistic response to glyphosate amounts, including a growth stimulant effect (hormesis), when plants absorbed less than 0.6 µg. The treated plants presented a normal pattern of glyphosate allocation, with the apex the principal sink, accumulating more than 38% of mobilized glyphosate. When corn plants absorbed more than 0.6 µg they showed a decrease in growth. The relatively high glyphosate quantities allocated in the new leaves showed the relevance of the symplastic pathway in the translocation process for root absorbed glyphosate.

Keywords

¿Quieres seguir leyendo? [Accede a la publicación completa]

¿Cómo los hombres podemos ser aliados en la prevención de la violencia de género?

El martes 26 de mayo, el Observatorio de Gestión de Personas de la Facultad de Economía y negocios de la Universidad de Chile, junto al centro de Desarrollo Gerencial (Unegocios), rea...

¿Se han agotado los Recursos Naturales de Chile?

El 18 de mayo de 2020 Chile se convirtió en el primer país latinoamericano con sobregiro ecológico, es decir, hemos agotado como país los recursos naturales que tenemos ...

Todos los Derechos © 2014 | Departamento de Administración - Facultad de Economía y Negocios - Universidad de Chile - Diagonal Paraguay 257, torre 26, oficina 1101, piso 11, Santiago, Chile.