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This article in CS

  1. Vol. 33 No. 5, p. 1095-1099
     
    Received: Apr 23, 1992
    Published: Sept, 1993


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doi:10.2135/cropsci1993.0011183X003300050043x

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

  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

Abstract

Abstract

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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