Complete plastid function, including gene expression, is necessary for photosynthesis. Furthermore, plastid genomes have been retained in non-photosynthetic plants (Wolfe et al., 1992) and even in the distantly related Apicomplexans (Wilson et al., 2003; see Chapter 24), which suggests that they have key functions outside of photosynthesis. Recently published reverse genetic experiments from Arabidopsis and tobacco (Ahlert et al., 2003; Kuroda and Maliga, 2003; Yao et al., 2003) provided the first direct evidence that plastid-encoded or plastid-localized proteins are necessary for embryogenic tissues to grow or develop.
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Cahoon, A.B., Komine, Y., Stern, D.B. (2007). Plastid Transcription: Competition, Regulation and Promotion by Plastid- and Nuclear-Encoded Polymerases. In: Wise, R.R., Hoober, J.K. (eds) The Structure and Function of Plastids. Advances in Photosynthesis and Respiration, vol 23. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4061-0_8
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