Effect of Zn2+ on photosynthetic oxygen evolution and chloroplast manganese |
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| Authors: | Mette Miller Raymond P Cox |
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| Institution: | Institute of Biochemistry, Odense University, Campusvej 55, 5230 Odense M, Denmark |
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| Abstract: | Treatment of thylakoid suspensions with Zn2+ causes the appearance of an EPR signal due to Mn2+. The size of the signal was linearly correlated with the inhibition of oxygen evolution. Full inhibition appeared to correspond to the release of 2 Mn atoms/reaction centre of photosystem II. The released Mn2+ remained associated with the chloroplast pellet on centrifugation and took several hours to equilibrate with the surrounding medium. The sequestered Mn2+ does not appear to be in the thylakoid interior but in a more restricted hydrophilic compartment. |
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| Keywords: | Chloroplast Thylakoid Manganese EPR Oxygen evolution Zinc treatment |
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