Identification of Compounds Which Account for Variation in P Concentration in Corn Hybrids
1971
Phillips, J. W. | Baker, D. E. | Clagett, C. O.
Phosphorus accumulation by corn (Zea mays L.) has been shown to be genetically controlled. Since the difference in accumulation of total P could have been due to metabolic differences resulting in the production of different amounts of one or several phosphorylated metabolites, a study of the chemical bases for the genetic differences between varieties of corn was performed. Extraction and analysis of dried, ground ear leaf samples indicated the presence of mostly inorganic P. Inorganic P was also found to be the major P component of extracts of fresh plants and leaves. Young plants and excised leaves of high accumulators were found to accumulate higher levels of P than low accumulators, but the difference was not as great as that reported for mature field-grown plants. Differences were found between varieties in the content of several P-containing components separated by ion exchange chromatography. The major component was orthophosphate. Orthophosphate was the only component which could account for the observed differences in P levels between varieties. This variation in the content of inorganic phosphate may be due to genetic differencs in th mechanism of absorption.
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