Abstract
The unicellular phytoflagellate Euglena gracilis is a well—suited organism for the study of regulatory circuits that underly differentiation processes in response to changing environmental conditions, e.g. light or carbon sources (Parthier, 1981; Kempner, 1982; Reinbothe and Parthier, 1990; Schwartzbach, 1990; for reviews). Light brings about chloroplast formation from proplastids in a gene expression program termed chloroplast development (Schiff and Schwartzbach, 1982). After light induction, the prothylakoids and the prolamellar body of the proplastids desintegrate, thylakoids emerge and are organized into lamellae. The pyrenoid region appears (Osafune and Schiff, 1980; Pellegrini, 1980). The whole morphological differentiation process depends on qualitative and quantitative changes of the plastid and nuclear genomes (summarized in: Reinbothe and Parthier, 1990). However, little is known how the expression of plastid and nuclear genes is coordinated. Since light-induced chloroplast development is repressed by certain organic carbon sources, e.g. ethanol (App and Jagendorf, 19 63; Monroy and Schwartzbach, 1984; Monroy et al, 1986; Monroy et al., 1987), photo- and metabolite-regulated steps in gene expression must be taken into account.
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