Since our laboratory first identified a low phytic acid wheat (lpa) genotype, Js-12-LPA, we have been working to evaluate the implications of incorporating the lpa phenotype into commercial wheat cultivars. Wild-type and low phytic acid families derived from the cross Grandin*4/Js-12-LPA were grown in replicated yield trials at Aberdeen, ID in 2003 and 2004. Phytic acid P in lpa grain was 36% lower than in wild-type grain, while inorganic P in lpa grain was 290% of wild-type grain. Grain from these trials was tempered and milled according to standard protocols of the American Association of Cereal Chemists. First break flour, reduction flour, shorts, and bran were analyzed for total phosphorus concentration, inorganic P, and phytic acid P. In addition, the macro- and micronutrient concentrations of these milling fractions were measured by ICP mass spectrometry at the University of Idaho Analytical Sciences Laboratory. Concentrations of Mg, Mn, K, and P were greater in break flour and reduction flour of lpa families than wild-type families. Concentrations of Zn and Fe were similar among lpa and wild-type families. These results indicate a functional shift in mineral distribution within the wheat kernel of lpa wheats.
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