Photophosphorylation in Isolated Maize Bundle Sheath Chloroplasts and Cells 1

AUTOR(ES)

Walker, Griffin H.

RESUMO

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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