Abstract
ABSTRACT: The effect of atrazine, mesotrione, and joint activity of atrazine plus mesotrione on pigment, lipid peroxidation, and antioxidant enzyme activity was studied. Atrazine and mesotrione treatments significantly reduced chlorophyll a (Chl a), chlorophyll b (Chl b), carotenoid concentrations, and protein content in bermudagrass (Cynodon dactylon L.) plants, whereas they significantly enhanced lipid peroxidation. The treatment of atrazine plus mesotrione caused greater phototoxic effect on bermudagrass than either herbicide alone, which was evident from the significantly decreased membrane stability noted as a function of the enhanced singlet oxygen and malondialdehyde (MDA) contents, as well as from the greater reduction in Chl a, Chl b, and carotenoid contents. Although bermudagrass activated the antioxidant enzymes catalase (CAT), peroxidase (POD), and glutathione S-transferase (GST), it was significantly injured after the herbicide treatments. Thus, results suggested that the enzymatic and non-enzymatic antioxidants of bermudagrass was overloaded after the treatment of atrazine plus mesotrione, and the reactive oxygen species (ROS) subsequently caused lipid peroxidation, pigment and protein degradation, as well as other cellular constituent damage.
Highlights
Under abiotic and biotic stresses, plants produce excessive amount of reactive oxygen species (ROS), resulting in oxidative damage (Jung et al, 2000; Ramel et al, 2009; Gill and Tuteja, 2010; Del Buono et al, 2011; Yang et al, 2015; Zhang et al, 2015)
Experiments were conducted in spring of 2016 at Chinese Academy of Tropical Agricultural Sciences, in Danzhou, Hainan, China to evaluate the effect of atrazine, mesotrione, and their combination on pigment concentration, protein content, lipid peroxidation, singlet oxygen, and antioxidant enzyme activity in bermudagrass
Atrazine applied at 0.28 g ha-1 caused ≤10% bermudagrass injury from 4 to 12 days after treatment (DAT), and 30 and 40% injury at 16 and 20 DAT, respectively (Table 1)
Summary
ABSTRACT - The effect of atrazine, mesotrione, and joint activity of atrazine plus mesotrione on pigment, lipid peroxidation, and antioxidant enzyme activity was studied. O tratamento com atrazina mais mesotrione causou maior efeito fitotóxico na grama-seda do que o herbicida isolado, o que foi evidenciado pela diminuição significativa da estabilidade da membrana em função dos teores de oxigênio singlete e malondialdeído (MDA), bem como pela maior redução dos teores de Clf a, Clf b e carotenoides. Embora a grama-seda ativasse as enzimas antioxidantes catalase (CAT), peroxidase (POD) e glutationa S-transferase (GST), ela foi significativamente danificada após os tratamentos com herbicidas. Os resultados sugerem que os antioxidantes enzimáticos e não enzimáticos da gramaseda foram sobrecarregados após o tratamento com atrazina mais mesotrione, e as espécies reativas de oxigênio (ERO) causaram peroxidação lipídica, degradação de pigmentos e proteínas, além de outros danos a constituintes celulares. WANG, Y. et al Atrazine and mesotrione-induced oxidative stress and impact on antioxidant enzymes and chlorophyll contents
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
