Transfer RNAs and aminoacyl-tRNA synthetases were isolated from 5- and 20-day-old etiolated ageing soybean cotyledons. The relative concentrations of Mg2+ and ATP for optimal acylation (using homologous tRNAs and synthetases) for the 16 amino acids tested indicate that the amino acids can be grouped into 3 categories with a Mg:ATP ratio of 2:1, 5:1 and 10:1 (aspartic acid, isoleucine, leucine, serine, and valine). The total amino acid acceptance for 5-day-old cotyledons was 0.427 μmol/μmol tRNA and 0.349 μmol/μmol tRNA for 20-day-old cotyledons. This shows that as cotyledons age, tRNA preparations show an overall decrease of 16.6% amino acid acceptance ability compared to tRNA from younger cotyledons.

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