Abstract
Root nodules of a few nitrogen fixing plants, expecially those of Anthyllis vulneraria and Medicago sativa were found to contain between 3.8% and 2.3% of their total dry matter as non-protein nitrogen. Amino-N that represented only a minor fraction of this reduced-N, greatly increased after acid hydrolysis, particularly in the case of M. sativa nodules. This increase in amino-N was related to hydrolysis of bound forms of 4-aminobutyric acid which represented at least 6.6% of the dry matter. Bound forms of 4-aminobutyric acid are considered to be cationic compounds judging by their electrophoretic mobilities in acid conditions and their very strong reaction with the Dragendorff's reagent. Six of them, isolated using conventional amino acid analysis, were studied in respect to their acid stability and their significant content of 4-aminobutyric acid associated with a few other amino acids.
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