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. 1969 Nov;115(2):129–133. doi: 10.1042/bj1150129

Purine metabolism in germinating wheat embryos

C E Price 1, A W Murray 1
PMCID: PMC1185082  PMID: 4314115

Abstract

1. Both the acid-soluble fraction and the nucleic acid fraction of wheat embryos were extensively labelled after incubation for 6hr. in the presence of [8-14C]adenine. Subsequent incubation in the absence of labelled adenine resulted in no loss of radioactivity to the medium during a 48hr. period. Radioautography indicated that during this period there was a continuous increase in the radioactivity present in the acid-insoluble fractions of the root and leaf tissues relative to that present in the coleorhiza and coleoptile. 2. During incubation at 25° there was a 26-fold increase in the activity of 3′-nucleotidase between 4hr. and 24hr.; the activities of enzymes hydrolysing AMP and IMP increased to a smaller extent. The activities of adenine phosphoribosyltransferase and hypoxanthine phosphoribosyltransferase increased three- to five-fold during incubation at 25° for 24hr. 3. Adenosine kinase, inosine phosphorylase and 5-phosphoribosyl pyrophosphate synthetase activities were high in extracts from dry embryos and did not increase during 48hr. at 25°. 4. The increase in 3′-nucleotidase activity was prevented by cycloheximide, cryptopleurine or incubation at 4°, but not by actinomycin D; these treatments did not depress the activity of the other enzymes measured. 5. The results are discussed in relation to RNA translocation within the wheat embryo during germination.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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