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The absorption changes at 254 nm which are coupled with the formation of plastohydroquinone (PQ = ) depend strongly on the intensity and duration of the actinic light (fig. 2). At an intensity of 10 6  erg·sec -1 ·cm -2  and a duration of 0,1 sec, maximal reduction is obtained. The reduction of chlorophyll-ai ° was followed by absorption changes at 703 nm. From the changes at 254 and 703 nm (fig. 3 and tab. 1) follows: PQ=: Chl-a I  = 5:1 (with Δε = 1,3·10 4 l · Mol- 1 · cm -1  for PQ at 254 nm and Δε = 3,6 · 10 4  l · Mol -1  · cm -1  for Chl-a I  at 703 nm). This value corresponds to a pool of plastoquinone with a dynamic capacity of ten electrons. This value is exactly the same as that which was derived in another way in the preceding paper  3 .

Zur Plastochinonreduktion bei der Photosynthese