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Plant and Cell Physiology, 1979, Vol. 20, No. 1 93-102
© 1979

Article

Synthetic rates of chloroplast and cytoplasmic ribosomal ribonucleic acids during the cell cycle of Chlorella

Atsushi Hirai, Takao Nishimura and Tatsuichi Iwamura

Institute for Biochemical Regulation, Faculty of Agriculture, Nagoya University Nagoya 464, Japan

By feeding radioisotopic precursors of RNA ([5-3H]uracil and [5-3H]uridine) to cells of Chlorella ellipsoidea at various stages in the cell cycle effected by autotrophic synchronous culture, we examined synthetic rates of the chloroplast and the cytoplasmic ribosomal ribonucleic acids (chl-rRNA and cyt-rRNA, respectively). The net incorporation of the precursors into chl-rRNA was higher than that into cyt-rRNA in the early stages of the cell cycle, and vice versa in the late stages. The specific activity of chl-rRNA was extremely high, and this phenomenon was likely to be intrinsic to small cells at the start of the cell cycle under autotrophic conditions, namely, cell-cycle stagespecific. We conclude that algal cells grown autotrophically synthesize chl-rRNA at a distinctly higher rate than cyt-rRNA in the early stages of the cell cycle.

(Received July 21, 1978; )
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