Abstract
PMS-dependent photophosphorylation in bundle sheath chloroplasts isolated from Zea mays was monitored by using a continuous method. Carbonyl cyanide p-trifluoromethoxyphenylhydrazone (FCCP) and venturicidin were shown to inhibit the ATP-synthesis. Venturicidin has been shown to inhibit ATP-formation in both mesophyll and bundle sheath chloroplasts. In contrast to the case in mesophyll chloroplasts, FMN was not able to promote photophosphorylation in bundle sheath chloroplasts. The effects of other cofactors and inhibitors on the ATP-synthesis in bundle sheath chloroplasts are shown. No photoinduced synthesis of inorganic pyrophosphate was seen, neither in bundle sheath chloroplasts, nor in mesophyll chloroplasts.
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