Summary
RNA-synthesis by isolated chloroplasts fromAcetabularia mediterranea andPolyphysa cliftonii has been studied under conditions which exclude the possibility of errors due to contamination of the preparations by nuclei, nuclear fragments or microorganisms.
Radioactive RNA isolated from chloroplasts has a sucrose density gradient sedimentation profile with peaks near 23 s, 16 s, 9 s, and 4 s. The 23 s and 16 s peaks were identified as ribosomal RNA. The 4 s component is considered to be t-RNA. The nature of the 9 s-peak is unknown.
Incorporation of RNA precursors is inhibited by darkness, actinomycin and DNase.
The incorporation of any one of the 5'-nucleoside triphosphates of RNA was shown to occur independently of the presence of the other three nucleoside triphosphates in the medium. These results have been taken as further evidence of the presence of an endogenous pool of nucleoside triphosphates within the chloroplasts.
Anion exchange chromatography of alkaline hydrolysates of the newly synthesized RNA has shown that the precursors are incorporated into the four 2'(3')-nucleoside monophosphates of RNA.
The significance of these findings to the question of autonomy of chloroplasts has been discussed. It has been concluded that the amount of template DNA available in the chloroplasts is not sufficient to support a complete genetic autonomy of the chloroplasts.
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The experiments described in this paper are submitted to the Mathematisch-Naturwissenschaftlihen Fakultät der Universität Köln in partial fulfillment of the requirements for a doctor's degree.
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Berger, S. RNA-synthesis inAcetabularia . Protoplasma 64, 13–25 (1967). https://doi.org/10.1007/BF01257379
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DOI: https://doi.org/10.1007/BF01257379