Abstract
As reported previously, a relationship between the pattern of seed amino acids and plant taxonomy was found to exist in Gramineae plants. This paper describes the further study on the protein fractions, albumin, globuline, prolamin and glutelin, obtained from the seed of Gramineae plants. The amino acid composition of each of these fractions was determined for rice of the subfamily Pharoideae, wheat and naked barley of Pooideae, and for Japanese barnyard millet and foxtail millet of Panicoideae. The microbiological method for amino acid assay was applied throughout the study.Prolamin of rice and millets gave alanine, leucine and aspartic acid values markedly higher than those of wheat and naked barley. The amino acid pattern of glutelin of millets was also observed to differ from other plants in the level of several kinds of amino acid, while albumin and globulin gave no remarkable difference in their amino acid pattern among the subfamilies.The variation of amino acid pattern with the subfamily of the source plant was believed to be a consequence of differences in both the amino acid levels of each protein fraction and the contents of the protein fractions. It was concluded that the amino acid pattern of the seed or seed protein, characterizing subfamily in Gramineae, was a dependable acid as an index in plant taxonomy.
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