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Changes in Photosynthesis and Respiration of Hyoscyamus muticus and Datura stramonium in Response to Salinization



Changes in Photosynthesis and Respiration of Hyoscyamus muticus and Datura stramonium in Response to Salinization



Phyton (Horn) 30(2): 273-281



The light-fixation of 14CO-2 by Hyoscyamus muticus and Datura stramonium decreased with the rise of salinization level. The incorporation of the radioactive carbon however into the various metabolic fractions (sugars, lipids, organic acids, amino acids and alkaloids) in both plants varied according to the plant tested as well as the level of salinization used. The photosynthetic oxygen evolution was also followed under the various treatments. In the case of H. muticus, salinized for 20 days, the oxygen evolution was inhibited with the rise of salinization level, but when the plants were salinized for 40 or 60 days, oxygen evolution was markedly enhanced, especially under the moderate salinization levels. In the case of D. stramonium the photosynthetic oxygen evolution was generally enhanced with the rise of salinization level, whatever the salinization period applied. Respiration of H. muticus, salinized for 20 or 40 days, was retarded with the rise of salinization level. When salinized for 60 days, however, oxygen consumption was highly enhanced. In D. stramonium, the consumption of oxygen was always enhanced with the rise of salinization level whatever the period (20, 40 or 60 days) of salinization used.

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