The Ureides

Quantitative determination of calcium oxalate and oxalate in developing seeds of soybean (Leguminosae)

“…During soybean pod fill (seed development), much of the exported ureides are directed here. Ureide catabolism produces one molecule of glyoxylate and generally two molecules of urea (Schubert and Boland, 1990). Contrary to the known roles of glyoxylate in the glyoxylate cycle and the photorespiratory nitrogen cycle, glyoxylate produced from ureides has no known function.…”

Purine and Pyrimidine Nucleotide Synthesis and Metabolism

“…An alternative route of xanthine formation has been proposed to occur in soybean nodules. In nodule cells IMP is initially converted to XMP by IMP dehydrogenase and then dephosphorylated (Schubert and Boland, 1990). Therefore, two possible routes of xanthine formation from IMP may be operative in plants (i) IMP AE inosine AE hypoxanthine AE xanthine and (ii) IMP AE XMP AE xanthosine AE xanthine ( Figure 5).…”

“…A more comprehensive understanding of the role(s) of specific nucleotide biosynthetic enzymes throughout plant development and factors that regulate their activity/expression is still lacking. Ultimately this information will explain how the requirements of different plants are met, such as those of ureide-producing legumes (Schubert and Boland, 1990) or those synthesizing caffeine (Suzuki et al, 1992;Ashihara and Crozier, 1999).…”

Differences in nitrogen metabolism of Faidherbia albida and other N2‐fixing tropical woody acacias reflect habitat water availability

“…It is well known that amide-transporters require less water than ureide-transporters to transport combined N, and that amides are more watersoluble than ureides (Schubert & Boland, 1990). It would therefore be an advantage for amide-transporting species to colonize arid regions, ureidetransporting species being more adapted to areas of greater water availability (Schubert & Boland, 1990).…”

“…It would therefore be an advantage for amide-transporting species to colonize arid regions, ureidetransporting species being more adapted to areas of greater water availability (Schubert & Boland, 1990).…”