Relationships between amino acid contents and peroxidase isozymes in leaf blades of mulberry (Morus spp.)

Summary Varietal differences of amino acid contents and total nitrogen content were determined in the leaf blades of mulberry (Morus spp.) which is the food source of the silkworm. Between the peroxidase isozyme genotypes, Px₁¹Px₁¹ or Px₁¹Px₁¹ and Px₁²Px₁², there were significant differences at the 1% level in total amino acid content and contents of threonine, aspartic acid and serine, at the 5% levelin contents of isoleucine, glycine and phenylalanine. All of these amino acid contents were higher in Px₁¹Px₁¹ and Px₁¹Px₁¹Px₁¹ than in Px₁²Px₁². But there was no significant difference in contents of the other amino acids and total nitrogen between the genotypes.