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- Seitenbereich
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309-320
- Zusammenfsg.
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Chloroplasts, once free living cyanobacteria, have lost most of their genetic information after endosymbiosis. Part of this information is either completely lost from the eukaryotic cell or was transferred from the plastids to other organelles, mainly to the nuclei. Thus, many regulatory processes which control proper development of plastids and their coordinated interaction with the eukaryotic environment depend on genetic information from the nuclei. Besides nuclear-localized genes from former free-living cyanobacteria, also genes from the anchestors of mitochondria and newly aquired genes contribute to this regulatory network (Martin and Herrmann, 1998; Abdallah et al., 2000). Therefore, identification of these genes should greatly increase our understanding of biogenesis and regulation of plastid development. Here we report on the isolation and characterization of two nuclear-encoded genes for regulatory proteins which are essential for photoautotrophic growth of higher plants. Phylogenetic analyses revealed that these genes are of procaryotic origin. In addition, we give a brief overview of a screen for new mutants impaired in plastid functions and photoautotrophic growth.
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