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Crop Science Abstract -

Relationship to Maize Seedling Responsee to Lysine-Plus-Threonine Medium and Whole Kernel Amino Acid Profile


This article in CS

  1. Vol. 33 No. 5, p. 1095-1099
    Received: Apr 23, 1992

    * Corresponding author(s):
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  1. D. A. Muenchrath and
  2. R. L. Phillips 
  1. D ep. of Agronomy, Iowa State Univ., Ames IA 50011
    D ep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108



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.

This material is based on work supported under a National Science Foundation Graduate Fellowship. Contribution of the Minnesota Agric. Exp. Stn., Scientific Journal Series Paper no. 79,711

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