Abstract
Abstract The plastid phosphate translocators located in the inner envelope membrane of chloroplasts and nongreen plastids mediate important translocation steps during the allocation of photoassimilates from sourceto sink-tissues. Repression of the chloroplast translocator severely alters diurnal carbon partitioning between leaves and sink tissues. Under physiological conditions, the translocator mediates a strict counterexchange of substrates. However, experiments with the reconstituted translocator demonstrate that transport can also occur by a channel-like uniport mechanism resulting in drastically increased transport rates. The chloroplast translocator is different from the analogous protein of non-green tissues. In all tissues examined, the translocator of non-green plastids only accepts glucose-6-phosphate in addition to phosphate and phosphorylated C3-compounds. The glucose-6-phosphate is subsequently used for starch synthesis.
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