Oxalate is produced and accumulated in many crop plants and pasture weeds. Although oxalate can be a major constituent of plants, important aspects of its biosynthesis, accumulation, and catabolism are unresolved. A major precursor of oxalate is glyoxylate. Oxalate accumulators can also form oxalate by C2/C3 cleavage of ascorbic acid. Plant oxalate content is affected by nitrogen source, inorganic ion availability, and other environmental factors. Ontogenetic stage and genotype are also important factors. Oxalate may play a role in ion balance and osmoregulation. Oxalate oxidase and oxalate decarboxylase are present in some plants, and oxalate can be catabolized and the carbon recycled. Oxalate accumulation Pennisetum americanum 1.2-2.2 G Goswami et al., 1970 P. americanum, hay 1.0-2.8 G Sing et al., 1980 P. americanum, hay 0.3-1.4 1.5-2.3 Lai et al., 1966d P. americanum X purp, hay 0.2-2.3 1.3-3.0 Lai et al., 1966d P. purpureum, hay 2.4-2.6 3.3-3.6 Lai et al., 1966d P. purpureum, hay 3.3

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