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Relationship to Maize Seedling Responsee to Lysine‐Plus‐Threonine Medium and Whole Kernel Amino Acid Profile
Author(s) -
Muenchrath D. A.,
Phillips R. L.
Publication year - 1993
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1993.0011183x003300050043x
Subject(s) - lysine , methionine , biology , tryptophan , amino acid , threonine , seedling , biochemistry , zea mays , essential amino acid , food science , botany , agronomy , serine , enzyme
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.