Читать книгу Plant Nucleotide Metabolism - Hiroshi Ashihara - Страница 78

The importance of purine salvage has been demonstrated in plants as well as other organisms. Purine salvage enzyme-deficient mutants do not grow normally. This recycling pathway is not only energetically advantageous for nucleotide formation, but also the rapid turnover of nucleotides by the salvage reactions is essential for normal cellular growth and homeostasis. A further role of salvage enzymes is to catalyse the removal of purine bases and nucleosides which inhibit the flow of metabolites and cause toxicity. The salvage activity is closely associated with physiological events in plants. Onset of seed germination, cell division and growth, breaking dormancy, and recovery from several stresses all require purine nucleotides produced by these purine salvage reactions. Purine salvage activity associated with plant developmental and physiological events has been discussed in detail by Ashihara et al. (2018).