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Experimental studies on sulfur dioxide injuries in higher plants

II. Disturbance of Amino Acid Metabolism in Plants Exposed to Sulfur Dioxide

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Photosynthesis is reversibly inhibited by exposing plants to SO2. The formation of α-hydroxy sulfonate in the exposed plants is suggested as one of the effects, because this compound inhibits glycolic oxidase which is necessary in the glycolic acid pathway. The suppression of the glycolic acid path should affect various aspects of metabolism in plants, particularly the reduction of the biosynthesis of glycine and serine. In this paper, the biosynthesis of these amino acids in plants exposed to SO2 was investigated to estimate the significance of the formation of α-hydroxy sulfonate in the plants. The results show that photosynthetic formation of serine was reduced in the exposed plants, and that α-hydroxy sulfonate was formed.

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Tanaka, H., Takanashi, T., Kadota, M. et al. Experimental studies on sulfur dioxide injuries in higher plants. Water Air Soil Pollut 1, 343–346 (1972).

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