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Synthesis and Stability of Chloroplast Ribosomal—RNA's

Botany Department, King's Buildings, Edinburgh University, Edinburgh, Scotland

The chloroplast ribosomal-RNAs (1.1 x 10⁶ and 0.56 x 10⁶ mol wt) are synthesized in the normal ratio of 2:1. The non-ribosomal distribution observed after extraction and fractionation results from the lability of the 1.1 x 10⁶ component, and a correction for this breakdown can be applied in certain cases. Newly synthesized 1.1 x 10⁶ RNA is more stable than the older accumulated 1.1 x 10⁶ RNA. Accumulation of the chloroplast RNA during growth of radish cotyledons occurs at a later time than the accumulation of cytoplasmic RNA, and its turnover is much less than that of the cytoplasmic ribosomal-RNA.

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				D. Grierson, M. E. Rogers, M. L. Sartirana, and U. E. Loening The Synthesis of Ribosomal RNA in Different Organisms: Structure and Evolution of the rRNA Precursor Cold Spring Harb Symp Quant Biol, January 1, 1970; 35(0): 589 - 598. [Abstract] [PDF]