This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Ingle, J. Search for Related Content PubMed PubMed Citation Articles by Ingle, J. Agricola Articles by Ingle, J.

Articles

The Effect of Light and Inhibitors on Chloroplast and Cytoplasmic RNA Synthesis

Botany Department, Edinburgh University, Edinburgh, Scotland

Chloroplast RNA is synthesized in dark-grown radish cotyledons at about one-third the rate of that in the light. The synthesis, however, continues for longer in the dark and the percentage of chloroplast RNA can approach that in light-grown tissue. Light stimulates the synthesis and accumulation of both cytoplasmic and chloroplast RNA, but shows a 4-fold greater stimulation of the chloroplast RNA. Chloramphenicol, streptomycin and cycloheximide inhibit the synthesis of chloroplast RNA with little effect on cytoplasmic RNA. 5-Fluorouracil inhibits the synthesis of cytoplasmic more than chloroplast RNA. Synthesis of the 0.56 x 10⁶ mol wt chloroplast RNA is inhibited much less than the other ribosomal RNA components by actinomycin D.