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Crop Science Abstract -

Analysis of Two Enzyme Proteins in Some Gcnotypes of Corn (Zea mays L.)1


This article in CS

  1. Vol. 11 No. 3, p. 387-390
    Received: Oct 27, 1970

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  1. N. K. Chatterjee and
  2. C. O. Gardner2



Two enzyme proteins [alcohol dehydrogenase (ADH) and esterase] were analyzed electrophoretically; where possible, kinetic measurements for ADH were made in two exotic varieties of corn (Zea mays L.), some elite inbred lines and their hybrids, and two mutant lines developed by ethyl methane-sulfonate (EMS) and thermal neutron treatments. Starch gel electrophoresis in a discontinuous buffer system for the two enzymes indicated their existence in multiple forms (isozymes) in the genotypes studied. All of the inbreds, except one, had two anode-migrating isozymes of ADH, one of which was fast and the other slow moving. Of two mutants (EMS- and thermal neutron-induced) from one inbred, only one (EMS) showed an isozyme pattern different from the original line. All single and double crosses showed the presence of hybrid enzyme in addition to the parental enzymes. Estimated specific activity values of ADH were lower in all the hybrids, except one, in comparison with the corresponding mid-parent values. Km's for ethanol incrude enzyme preparations of the hybrids were lower than those of the mid-parents of the hybrids. Km's of the two mutants were higher than that of the control.

Three of five anode-migrating isozymes of esterase were found in the different genotypes. The EMS mutant showed an isozyme pattern different from the control. No hybrid enzyme for esterase was found in the hybrids. Possible use of isozyme studies in populations and sets of lines derived from them, and relating such studies to grain yield, are discussed.

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