PJB-2018-18
CHANGES IN OXIDATIVE STRESS IN MAIZE SEEDLINGS DURING METOLACHLOR and ATRAZINE TREATMENT
SONGÜL ÇANAKCI GÜLENGÜL
Abstract
ABSTRACT The present study investigated physiological and biochemical effects of Atrazine (0, 200, 500, and 1000 μM) and Metolachlor (0, 100, 500, and 1000 μM) concentrations applied to 15-day-old seedlings of three maize varieties (Zea mays L., cv. Saccharata, cv. Danona, and cv. Advanta 2898) for 48 hr. Hydroponic method was preferred for all treatments in the seedlings. Compared to their controls, GSH/GSSG ratio decreased/decreased, SOD activity increased/increased, and CAT activity decreased/decreased in root/leaf of maize seedlings treated with Atrazine. While % ratios of fatty acids in leaf increased for palmitic acid and palmitoleic acid, it was observed to decrease in both only for cv. Danona. While the rate of linoleic acid increased in leaves but decreased only in cv. Saccharata; linoleic acid increased only in cv. Saccharata and decreased in others. Compared to their controls, GSH/GSSG ratio decreased/increased, SOD activity decreased/increased, and CAT activity decreased/decreased in root/leaf of maize seedlings treated with Metolachlor. While % ratios of fatty acids in leaf showed an exceptional increase and increase for linolenic acid, palmitic acid, and linoleic acid; palmitoleic acid and stearic acid decreased and palmitic acid decreased only in cv. Advanta 2898. Generally, the inhibitive effect of the herbicides Atrazine and Metolachlor elevated in parallel to increased dose (1000 μM). However, Atrazine displayed a more inhibitive effect than Metolachlor. Keywords: Maize (Zea mays L.), oxidative stress, atrazine, metolachlor, herbicides.
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