The sequence of initiation of RNA, DNA and protein synthesis in the wheat grains during germination

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The syntheses of main macromolecular substances, in a whole wheat grain allowed to germinate, are triggered in the following order: RNA, protein, DNA. The RNA synthesis, as judged by [2- 14C]uridine incorporation, is initiated almost immediately after the seeds are exposed to the optimal germination conditions, whereas [1- 14C]leucine and [2- 14C]thymidine incorporation begins to occur only 3 and 4 hr later, respectively. The initiation of protein synthesis is accompanied by an apparent cessation of uridine incorporation.