Photophosphorylation in isolated maize bundle sheath chloroplasts and cells |
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Authors: | Walker G H Izawa S |
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Institution: | Department of Biology, Wayne State University, Detroit, Michigan 48202. |
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Abstract: | Isolated maize bundle sheath chloroplasts showed substantial rates of noncyclic photophosphorylation. A typical rate of phosphorylation coupled to whole-chain electron transport (methylviologen or ferricyanide as acceptor) was 60 μmol per hour per milligram chlorophyll) with a coupling efficiency (P/e2) of 0.6. Partial electron transport reactions driven by photosystem I or II supported phosphorylation with P/e2 values of 0.2 to 0.3. Thus, two sites of phosphorylation seem to be associated with the photosynthetic chain in much the same way as in spinach chloroplasts. |
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