Biochemistry of Amino Acids - A. Majster 1961
Intermediary Metabolism of Amino Acids
Proline
Proline Metabolism in Plants
Klein and Linzer [372] demonstrated that the administration of proline to certain plants enhances the synthesis of proline methylbetaine—stachydrine [371, 378, 389].
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In alfalfa, 2-C14-Ornithine was not incorporated into stachydrine [373]. These findings indicate that no significant conversion of ornithine to proline takes place in this plant; instead, proline in alfalfa is synthesized primarily via the pathway involving glutamic acid—possibly through glutamic acid semialdehyde.

Fig. 13. Summary scheme of proline transformations.
Last update: 06/08/2026
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