Changes in the activity of malate dehydrogenases and malic-enzymes in the green leaves and the isoenzyme spectrum of malic-enzymes in different conditions of manganese nutrition of winter wheat, maize, peas, cucumber, tomatoes have been studied. For manganese fertilization pre-sowing seed treatment and leaf spraying of plants with a solution of manganese sulfate at a concentration of 0.05 and 0.10 % were used. The content of manganese in plant tissues was determined by the method of atomic absorption spectrophotometry. The activity of the malate dehydrogenase system enzymes was determined in the homogenates of the leaves. It was shown that under experimental conditions, in a variant with a deficit of manganese, the amount of this element was reduced by 5—10 times compared with the control, and in variants with manganese fertilization — increased by 1.5—2 times. Accordingly, the manganese deficit decreased sugars, sucrose, protein and chlorophyll contents, while manganese fertilization increased those parameters. The influence of the level of manganese nutrition of plant on the activity of NAD and NADP-dependent malate dehydrogenases and NAD and NADP of malic-enzyme activities, as well as on the isozyme spectrum of NAD and NADP malic enzymes was studied In the stressful conditions of manganese deficit in C3 plants, the activity of malic-enzyme decreased by 5—7 times, in corn — by 2 times. Treatment with manganese caused an increase in the enzyme activity by 5—20 %. The conducted electrophoretic studies allowed to establish that the level of manganese nutrition significantly affects the isoenzyme spectrum of malic-enzyme. Obtained results indicate the possibility of using of changes in the activity of malate dehydrogenase system enzymes, in particular NADP-ME, for diagnostics of the manganese supply in plants.
Keywords: manganese, agricultural plant, treatment, deficiency, malatedehydrogenase
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