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The Role of Phytic Acid in the Wheat Grain ¹

^a Department of Agricultural Biochemistry, Waite Agricultural Research Institute, University of Adelaide, Adelaide, South Australia

The concentrations of adenosine triphosphate and phytic acid in testa, embryo plus scutellum, aleurone, and endosperm fractions from grain of Triticum vulgare cv. Insignia have been determined during development under both normal conditions and those of water stress. Phytic acid was not detected in the endosperm. In the embryo plus scutellum and aleurone fractions there was a rapid build-up of phytic acid, but the adenosine triphosphate level did not change markedly at this time. These results are not consistent with physiological roles previously suggested for phytic acid other than the role of phytin as a phosphorus and cation store for the germinating seed.

¹ Financial assistance from the Australian Commonwealth Wheat Industry Research Council is gratefully acknowledged.

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