Abstract
Summary Immature chloroplasts located at the base of barley leaves near the meristematic zone incorporated 14 C from NaH 14 CO 3 into fatty acids at rates resembling (or some times exceeding) rates from [2- 14 C]acetate. Non-labeled acetate added at concentrations comparable to NaH 14 CO 3 did not affect the 14C-incorporation. In immature chloroplasts the chloroplastic pyruvate dehydrogenase complex (chIp PDC), which is the terminal enzyme of the chloroplast 3-phosphoglycerate ➙ acetyl-CoA pathway (Hoppe et al. 1993), was considerably more active than the acetyl-CoA synthetase (ACS). During chloroplast development, the carbon flow through this pathway decreased. At the same time, ACS activity increased and met the requirement for an effective acetate utilization for fatty acid synthesis in mature chloroplasts.
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