Abstract
A nucleic acid component (x‐RNA) has been found in high concentration in maize shoots. It is eluted from a MAK (methylated albumin kieselguhr) column at about the same position as messenger RNA. The amount of x‐RNA in pea epicotyls is absent or very low. It is suggested that x‐RNA is long‐lived messenger RNA and is found in high concentration in monocotyledonous plants, especially in the case of plants of the Gramineae family. Dicotyledonous plants, typically, contain little or no detectable x‐RNA as observed by ultraviolet absorbancy. In the case of corn shoots, x‐RNA is in highest concentration in the ribosomal fraction (78,500 × g, 70 min). In both maize shoots and pea epicotyls the newly synthesized nucleic acids were confined to the nuclear fraction (10,000 × g, 10 min).
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