Abstract
We concluded from previous work with digitonin subchloroplast particles that electron transport from DPIPH2 to MV (in the presence of DCMU) supports ATP formation at two sites, whereas PMS supports ATP formation at one site, using only a part of the electron transfer chain (NEUMANN et al 1971). This was based on the following observations and considerations: ATP formation supported by PMS does not saturate even at 4 x 105 erg cm-2 sec-1, whereas ATP formation supported by electron flow from DPIPH2 to MV saturates at 2 x 104 erg cm-2 sec-1. At a light intensity above 2 x 104 erg cm-2 sec-1 the rate of ATP formation in the presence of PMS is faster than that supported by electron transport from DPIPH2 to MV, however, below this rate the opposite is true.
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