Phytotoxic effect of Quizalofop-P-Ethyl on Soybean (Glycine max L.)

In this study, phytotoxic effects of phenoxy herbicide Quizalofop-P-Ethyl (QPE, ethyl (R)-2-[4-[(6-chloro-2quinoxalinyl)oxy]phenoxy] propionate) in Glycine max L. was investigated. The effective concentration (EC50) value was determined as approximately 0.4 M. Morphological and anatomical experiments were carried out using QPE concentrations of 0.4 M (EC50) and 0.8 M (EC50x2) on 5th and 10th days, by a control for each combination. QPE concentrations were applied with spraying method in 2-3 leaf stage. The phytotoxic effects were determined by morphological and anatomical experiments. Root and seedling growth, chlorophyll and carotenoid contents and seedling and leaf anatomy were identified. QPE exposure significantly reduced the amount of carotenoid and chlorophyll b pigments except of chlorophyll a in all treatment. Parallel to the increase in concentrations of QPE, there was a reduction in root and seedling length and also the lengths of the anatomical parts of seedlings were changed when compared with the control group. It is vital to confirm that the usage of QPE should be subject to control since it might have a toxic effect on farmers who applied the herbicide and humans who consumed the plant.