Cumulative effect of low and high atrazine concentrations on Arabidopsis thaliana plants

Abstract

Atrazine belongs to the widely used herbicides blocking the electron transport chain in chloroplasts, thus resulting in the generation of active oxygen species. In the present work, we demonstrated that, at low concentrations mimicking residual amounts, atrazine enhanced the susceptibility of Arabidopsis plants to further treatments with the same herbicide applied at the recommended field rate. Arabidopsis thaliana plants were treated three times (at five-day intervals) with 1 µ M atrazine. Five days after the last treatment, the plants were sprayed with 5 mM atrazine. Atrazine increased the levels of lipid peroxidation products, hydrogen peroxide, and ion leakage, and caused changes in the activities of antioxidant enzymes, such as superoxide dismutase, guaiacol peroxidase, and catalase.

Antioxidant activity of rice plants sprayed with herbicides

“…However, in later evaluations (24, 48 and 96 HAA), bentazon did not differ from the control, in terms of H 2 O 2 levels (Figure 1). Studies have shown that the use of triazines and ureas can induce oxidative stress (Bowler et al 1992, Ivanov et al 2005. Although bentazon does not belong to these classes of herbicides, it also acts by blocking the electron transport in photosynthesis, what originates reactive oxygen species, such as H 2 O 2 .…”

Phytotoxicity assessment of atrazine on growth and physiology of three emergent plants

“…Photosynthetic inhibition for submerged vascular plants increased with the increase of atrazine concentration (Jones and Winchell 1984). Atrazine blocks the electron transport chain in chloroplasts, thus resulting in the generation of reactive oxygen species (ROS) and consequently inducing the development of antioxidative defenses (Ivanov et al 2005). Plant tolerance to the herbicide might confer by differential antioxidative mechanism (Alla and Hassan 2006).…”

Separation and quantification of the cellular thiol pool of pea plants treated with heat, salt and atrazine

“…Generally, the stress impacts to which the plants were subjected can be defined as mild, according to the definition of Lichtenthaler (1996). The concentrations, intensity and duration of the stresses were selected on the basis of previous physiological research (De la Torre and Burkey, 1992;Ivanov et al, 2005).…”