Origin and Seed Phenotype of Maize low phytic acid 1-1 and low phytic acid 2-1
| Autor: | Kevin A. Young, Pushpalatha P.N. Murthy, Andrew T. Bauman, David S. Ertl, Victor Raboy, William F. Sheridan, Paola F. Gerbasi, Sierra D. Stoneberg, Suewiya G. Pickett |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Plant Physiology. 124:355-368 |
| ISSN: | 1532-2548 0032-0889 |
| DOI: | 10.1104/pp.124.1.355 |
| Popis: | 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 othermyo-inositol (Ins) phosphates (and/or their respective enantiomers): d-Ins(1,2,4,5,6) P5;d-Ins (1,4,5,6) P4; andd-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. |
| Databáze: | OpenAIRE |
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