Reversible abolition of enhancement in isolated spinach chloroplasts |
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Authors: | Sinclair J |
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Affiliation: | Department of Biology, Carleton University, Ottawa, Ontario. |
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Abstract: | The photosynthetic evolution of oxygen by isolated chloroplasts of Spinacia oleracea L. was studied using a modulated oxygen electrode. The enhancement effect, measured as the increase in the relative quantum yield of 650-nanometer light due to the presence of 710-nanometer light, was profoundly influenced by the concentration of inorganic cations in the bathing medium. Chloroplast fragments immersed in a solution containing a very low concentration of MgCl2 or KCl, did not display enhancement but could be made to do so by raising the concentration of MgCl2 to 3 mm, or that of KCl to 35 mm. This change in the enhancement properties was completely reversible. The maximum value of enhancement in a MgCl2 solution appeared to occur at a concentration between 15 and 30 mm, while in KCl, the enhancement effect increased almost linearly up to a concentration of 100 mm. |
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