Gibberellic acid (GA3) has been shown to play a significant function in influencing gene expression in plant cells. In many plants (e.g., barley and wheat), application of GA3 resulted with an upsurge in the proportional amounts of poly (A)+ RNA. It has been shown in wheat aleurones and embryos that GA3 influences activity of poly (A) polymerase, the enzyme responsible for poly- adenylation of mRNA. Thus, it appears that the regulation of this enzyme could be crucial for regulating the relative amounts of poly (A)+ RNA in plant cells. Since application of GA3 also promotes the synthesis of RNA, it was considered worthwhile to see whether GA3 regulates the activity of RNA polymerase II in dwarf pea epicotyls. Prior to this study regulation of this enzyme by GA3 has been reported in dwarf pea epicotyls. However, the effect of this phytohormone was perceived after 48hr of treatment. Therefore, it was difficult to precisely state whether it is a primary or secondary effect of the phytohormone. Also, the precise extent of impact of RNA polymerase by GA3 was not known. With a view to elucidate the mechanism by which GA3 regulates the activity of transcriptional enzymes, this problem was taken up in the dwarf pea epicotyl RNA polymerase II system. The research findings clearly show that the regulation of RNA polymerase II can be achieved within a short duration of time (2hr). A more systematic study has revealed that the phytohormone regulates RNA polymerase II activity at the post-translational level.