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The incorporation of ¹⁴C-aspartate during the imbibition of yellow lupin seeds resulted in the production of ¹⁴C-alanine and ¹⁴CO₂. On the basis of tracer and enzymatic assays, conducted in vitro on the extract obtained from lupin seeds, it is postulated that aspartate can be converted to oxaloacetate, then, by phosphoenolopyruvate and pyruvate to alanine. This pathway can be catalyzed by the following...
The rate of phosphoenolpyruvate carboxylation by extracts from germinating lupin seeds was measured through the H¹⁴CO₃ fixation. PEP carboxylation in seed axes increased during their imbibition, mainly as a result of the increase in the activity of PEP carboxylase [EC 4.1.1.31]. However, the activity of PEP carboxykinase [EC 4.1.1.38], present during the first 3 hours of imbibition, as well as the...
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