ADAPTIVE EFFECT OF CYTOKININ ON SOYBEAN PLANTS UNDER THE ACTION OF CHRONIC ULTRAVIOLET B IRRADIATIONAim. The adaptive effect of cytokinin 6-benzylaminopurine (BAP) on soybean plants (Glycine max (L.) Merr.) under the action of chronic ultraviolet B (UV-B) radiation was studied. Methods. Soybean plants cultivar Musa were sprayed with the 10 -6 M BAP solution in the phase of two trifoliate leaves and exposed by chronic UV-B radiation at a dose of 6 kJ/m 2 per day for 8 days. Shoot length was measured, content of photosynthetic pigments and hydrogen peroxide (HP) were determined in the leaves. After the plants matured, the number of pods per plant was counted. Results. It was shown that the chronic UV-B radiation inhibited growth of soybean shoots, reduced the content of chlorophylls and carotenoids, increased the concentration of HP in the leaves, reduced the number of pods. Treatment of soybean plants by BAP solution before irradiation increasing of number of pods, delayed the degradation of photosynthetic pigments and stimulated their accumulation after UV-B radiation, regulated content of HP. Conclusions. It was shown that the treatment of soybean plants by BAP solution before the beginning of UV-B irradiation decreased the destructive effects of radiation on pigment complex, growth and productivity of plants and stimulated their adaptation to stress.
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