Studies on the “independence” of nucleolar ribonucleic acid synthesis

Pollen Tube Growth and Ribonucleic Acid Synthesis by Vegetative and Generative Nuclei of Tradescantia

“…AMEIUCAN JOURNAL OF BOTANY [Vol. 53 RNA synthesis in Tradescantia pollen tubes is actinomycin-sensitive and hence DNA-dependent, since actinomycin-D blocks synthesis of messenger-, ribosomal-, and transfer-RNA, by selecttively combining with the template DNAs needed for the RNA-polymerase reaction Izawa et al, 1963;Kirk, 1960;Muramatsu, Hodnett, and Busch, 1964;Reich et al, 1961;and Revel and Hiatt, 1964). Since RNA synthesis seems to occur over the entire nucleus, presumably part of it is of the messenger type.…”