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Isolated chloroplasts of Euglena gracilis have been shown to be capable of incorporating amino acids into protein (2). This incorporation is inhibited by actinomycin D, a fact which suggests that the chloroplasts might be capable of DNAdependent RNA synthesis. Such RNA synthesis is also indicated in a recent report (6) showing inhibition of chlorophyll synthesis by actinomycin. In conjunction with our studies of chloroplast synthesis and replication in Euglena, we have investigated this phenomenon and present here evidence for DNA-dependent RNA synthesis in isolated chloroplasts of this organism. Chlorophyll formation in colorless Euglena cells is also reinvestigated with regard to the synthesis of RNA and DNA. Much evidence has been accumulating which indicates that the DNA of Euglena chloroplasts may have a genetic role in the inheritance of chloroplasts (5, 7). The ability of this DNA to direct RNA synthesis might add support for this contention. Euglena gradlis strain Z was grown heterotropically on defined medium in light or dark at room temperature (25°C) with constant agitation at moderate speed, as described previously (5).

DNA-DEPENDENT RNA SYNTHESIS IN CHLOROPLASTS OF EUGLENA GRACILIS