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NONPHOTOSYNTHETIC METABOLISM IN PLASTIDS.

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  • 1Pflanzenphysiologie, University of Osnabruck, Barbarastrasse 11, D-49069 Osnabruck, Germany;, School of Biological Sciences, University of Manchester, Oxford Road, M13 9PL, Manchester, United Kingdom; e-mail: mike.emes@man.ac.uk

Abstract

Nonphotosynthetic plastids are important sites for the biosynthesis of starch, fatty acids, and the assimilation of nitrogen into amino acids in a wide range of plant tissues. Unlike chloroplasts, all the metabolites for these processes have to be imported, or generated by oxidative metabolism within the organelle. The aim of this review is to summarize our present understanding of the anabolic pathways involved, the requirement for import of precursors from the cytosol, the provision of energy for biosynthesis, and the interaction between pathways that share common intermediates. We emphasize the temporal and developmental regulation of events, and the variation in mechanisms employed by different species that produce the same end products.

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