Abstract
Poly A-rich RNA is synthesised in rye embryos as soon as they imbibe water. Three properties of newly-synthesised poly A-rich RNA have been examined at different stages of imbibition and germination: its base composition, the electrophoretic mobility of the entire molecule in polyacrylamide gels and the mobility of the poly A segment. The poly A-rich RNA synthesised during the first hr of imbibition appears to be stable for several hr in vivo. Evidence is presented which suggests that the poly A-rich RNA extracted in most experiments is not aggregated.
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