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Assessment of the Effect of Heavy Metal Salts on the Photosynthetic Activity of Aquatic Plants

机译：Assessment of the Effect of Heavy Metal Salts on the Photosynthetic Activity of Aquatic Plants

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Abstract—The status of the photosynthetic pigments in the aquatic plants Lemna minor L. and Elodea canadensis Michx. under the action of Ni2+, Co2+, Cu2+ and Pb2+ acetates in concentrations of 5.00, 2.50, 1.25, 0.62, 0.31, 0.15, 0.07, and 0.03 mg/L was assessed by changes in the fluorescence intensity of chlorophyll a and b and their ratio. It was established that nickel acetate in original solutions in all the above concentrations caused an increase in the fluorescence intensity of chlorophylls a and b in L. minor in relation to the control while the lead salt suppressed it. Co2+ acetate inhibited the fluorescence of chlorophyll a with concentrations in the initial solutions of 0.03 to 0.15 and 2.50 mg/L and that of chlorophyll b at all concentrations, except 0.62, 1.25, and 2.50 mg/L. For E. canadensis, it was found that the salts of all metals at all concentrations caused a reduction of the fluorescence intensity of chlorophyll a relative to the control and increased it in the case of chlorophyll b. The exception was the effect of copper and lead acetates with a concentration of 1.25?mg/L, when the fluorescence intensity of chlorophyll b was maintained at the control level. The presence of Ni2+, Co2+, Cu2+, and Pb2+ acetates in all concentrations in the culture medium influenced the quantitative and qualitative characteristics of chlorophyll a and b, which indicated a violation of the photosynthesis process. Our data on the change in the chlorophyll a/b ratio led to a conclusion about degradation of chlorophyll a relative to chlorophyll b after the effect of heavy metals.

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