Relationship to Maize Seedling Responsee to Lysine-Plus-Threonine Medium and Whole Kernel Amino Acid Profile
- D. A. Muenchrath and
- R. L. Phillips
Maize (Zea mays L.) kernels are nutritionally deficient in the amino acids lysine, tryptophan, and methionine. Exogenous lysine-plus-threonine (LT) synergistically inhibits root growth of geminating kernels. We tested the hypothesis that the relative growth of seedlings grown on LT-supplemented and unsupplemented media (LT response) is a function of the relative concentrations of kernel methionine and lysine. Thirty-three genotypes were evaluated for LT response and amino acid composition. The correlation between LT response and the methionine to lysine ratio (M/L) was highly significant (r = 0.59). The root-growth bioassay effectively detects kernels with altered amino acid concentrations.
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