The plants of winter rye (Secale cereal L., cv. Estafeta Tatarstana) were used in the analysis of separate and joint action of herbicide paraquat (10, 100, and 250 μM) and cytodef, a synthetic growth regulator with cytokinin activity (from 10–11 to 10–8 M) on parameters characterizing oxidative stress. Both pretreatment of the seeds of winter rye with cytodef in high concentrations and that of the leaves with paraquat led to the appearance of oxidative stress symptoms in plants that were dependent on concentrations used. Cytodef combined with the herbicide contributed to normalization of plant state, which was manifested in reduced intensity of lipid peroxidation, as well as in reduced activity of catalase and ascorbate peroxidase in plant leaves. Maximal reduction in the damaging action of paraquat was identified in variants pretreated with cytodef in concentrations of 10–11 and 10–10 M; it was more pronounced in the aftereffect of treatment of rye plants with paraquat at high doses (100 and 250 μM). The dual effect of cytodef manifested in reduced damaging effects of paraquat (at low concentrations of cytodef) and maintained effects of paraquat (at high concentrations of cytodef).
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 18, 2015
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