Effects of linuron and dimethenamid on antioxidant systems in weeds associated with soybean

Abstract

Changes in antioxidant systems in soybean and associated weeds (Ambrosia artemisiifolia L., Chenopodium album L., Convolvulus arvensis L and Sinapis arvensis L.) were studied in relation to treatment with herbicides linuron and dimethenamid in the field experiment. Differences in the total superoxide dismutase (SOD) and catalase (Cat) activities were observed in plants after application of herbicide formulation. Quantities of superoxide (O2.-) and hydroxyl (·OH) radicals and malonyldialdehyde (MDA), reduced glutathione (GSH) and total polyphenols content were also determined. In addition to this, potential antioxidant activity of the plant ethanolic extracts were assessed based on the scavenging activity of stable DPPH free radicals. Results obtained suggest that plants investigated 1) expressed different antioxidant systems in response to herbicide treatment; 2) enzymatic and non-enzymatic protective mechanisms were complementary; 3) some weed species showed distinctive and combined activity of several biochemical parameters, such as Ambrosia artemisiifolia.

Time-Dependent Effects of Bentazon Application on the Key Antioxidant Enzymes of Soybean and Common Ragweed

“…Therefore, the activated antioxidant defence system can substantially and rapidly contribute to cell survival by alleviating the primary and secondary oxidative stress effects of herbicides besides activating other xenobiotic detoxification pathways in plants. This was confirmed in both weeds and soybean, where antioxidant enzymes were significantly activated after xenobiotic exposure such as oxyfluorfen [22], linuron [23], dimethenamid [23], glyphosate [24] and paraquat [25]. These results verified the presence of oxidative stress and the significance of antioxidants in defence reactions in the cells of both sensitive and tolerant plants.…”

Oxidative stress caused by Basagran® herbicide is altered by salicylic acid treatments in peanut plants

“…Basagran ® competes with quinone B (Q B ) for its binding site in PS II reaction center, thus decreasing the electron flow rate, from H 2 O to NADP + through PS II electron carriers. Blockage of PS II by bentazon induces the production of singlet and triplet chlorophyll energized states, as well as of reactive oxygen species (ROS) like singlet oxygen ( 1 O 2 ) (Macedo et al., 2008; Pospíšil, 2009; Rutherford and Krieger-Liszkay, 2001), superoxide anion (O 2 ¯), hydrogen peroxide (H 2 O 2 ), hydroxyl radical ( • OH), have been implicated in a number of physiological disorders in plants (Blokhina et al., 2003; Malenčić et al., 2008; Scandalios, 1993) and promote oxidative damage in proteins and membranes of photosynthetic cells (Pospíšil, 2009).…”

Physiological Changes Accompanied with Some Herbicides on Peanut Leaves, Arachis hypogaea L.

“…Bentazon inhibits PS II, resulting in the generation of energetic singlet and triplet chlorophyll states, as well as reactive oxygen species (ROS) such as singlet oxygen (1O2) (Macedo et al, 2008), The superoxide anion (O2), hydrogen peroxide (H2O2), and hydroxyl radical (_OH) have all been linked to a variety of plant physiological problems (Blokhina et al, 2003;Malencic et al, 2008), and induced oxidative damage in photosynthetic cell proteins and membranes (Pospísil, 2009). SA has been proven in recent studies to govern plant adaptation responses to a wide range of biotic and abiotic stressors (Zhou et al, 2009;Cui et al, 2010), Because of less oxidative stress, SA administration to untreated leaves was able to trigger the synthesis of photosynthetic pigments in both cultivars, as shown in the results.…”