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Origin and Seed Phenotype of Maize low phytic acid 1-1 and low phytic acid 2-11

  • Victor Raboy
  • Paola F. Gerbasi
  • Kevin A. Young
  • Sierra D. Stoneberg
  • Suewiya G. Pickett
  • Andrew T. Bauman
  • Pushpalatha P.N. Murthy
  • William F. Sheridan
  • David S. Ertl
American Society of Plant Physiologists
Publication Date
Sep 01, 2000
  • Chemistry


Phytic acid (myo-inositol-1, 2, 3, 4, 5, 6-hexakisphosphate or Ins P6) typically represents approximately 75% to 80% of maize (Zea mays) seed total P. Here we describe the origin, inheritance, and seed phenotype of two non-lethal maize low phytic acid mutants, lpa1-1 and lpa2-1. The loci map to two sites on chromosome 1S. Seed phytic acid P is reduced in these mutants by 50% to 66% but seed total P is unaltered. The decrease in phytic acid P in mature lpa1-1 seeds is accompanied by a corresponding increase in inorganic phosphate (Pi). In mature lpa2-1 seed it is accompanied by increases in Pi and at least three other myo-inositol (Ins) phosphates (and/or their respective enantiomers): d-Ins(1,2,4,5,6) P5; d-Ins (1,4,5,6) P4; and d-Ins(1,2,6) P3. In both cases the sum of seed Pi and Ins phosphates (including phytic acid) is constant and similar to that observed in normal seeds. In both mutants P chemistry appears to be perturbed throughout seed development. Homozygosity for either mutant results in a seed dry weight loss, ranging from 4% to 23%. These results indicate that phytic acid metabolism during seed development is not solely responsible for P homeostasis and indicate that the phytic acid concentration typical of a normal maize seed is not essential to seed function.

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