Druse (botany)
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Through Algae, Flowering plant and Gymnosperm
Formation
A number of biochemical pathways for calcium oxalate biomineralization in plants have been proposed. Among these is the cleavage of isocitrate, the hydrolysis of oxaloacetate, glycolate/glyoxylate oxidation, and/or oxidative cleavage of L-ascorbic acid. The cleavage of ascorbic acid appears to be the most studied pathway. The specific mechanism controlling this process is unclear. Still, it has been suggested that a number of factors influence crystal shapes and growth, such as proteins, polysaccharides, and lipids or macromolecular membrane structures. Druses may also have some purpose in calcium regulation.