The amino acid compositions of polished barley grain were investigated for 16 varieties by using amino acid autoanalpzer and simple correlation analysis between them and between protein and amino acid per protein was done.
i) Limiting amino acid is lysine, leucine and phenylalanine are high but threonine and tyrosine are low. Total essential amino acids is high.
2) Protein is significantly correlated negatively with lysine arginine, total basic amino acids (at p=0.01) and threonine, alanine, aspartic acid (at p=0.05) and positively with phenylalanine (at p=0.01) proline and cystine (at p=0.05).
3) Lysine is positively and significantly correlated with arginine and aspartic acid indicating that aspartic acid is probable precursor of lysine and that high yielding varieties or fertilization for high yielding decrease aspartic acid pool resulting low lysine.
4) Lysine content is positively correlated with dye binding capacity (at p=0.01).
5) Tryptophan is positively (at p=0.01) and significantly correlated with histidine, total basic amino acids and arginine.
6) In essential amino acids lysine, tryptophan, threonine and valine simultaneously increase or decrease while aromatic amino acids, sulfur contained amino acids, isoleucine and leucine do so together.
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