Effects of Disalicylidenepropanediamines on Photosynthetic Electron Transport of Isolated Spinach Chloroplasts

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Abstract
The effects of disalicylidenepropanediamine (DSPD) and disulfo-disalicylidenepropanediamine (sulfo-DSPD) on the photosynthetic electron transport of isolated [Spinacio oleracea cv. Atlanta] chloroplasts were reexamined. The data suggest that DSPD, but not sulfo-DSPD, is an effective inhibitor of electron transport between photosystem II and photosystem I before or at plastocyanin. Both DSPD and sulfo-DSPD block electron transport at the site of ferredoxin. Under certain conditions DSPD and even more so sulfo-DSPD function as autooxidizable electron acceptors. DSPD can cause an inhibition of photophosphorylation. Apparently the use of DSPD as a specific inhibitor of ferredoxin-dependent reactions has to be questioned.