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Metabolism of myo-[2-³H]Inositol and scyllo-[R-³H]Inositol in Ripening Wheat Kernels ¹

Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164

Injection of myo-[2-³H]inositol or scyllo-[R-³H]inositol into the peduncular cavity of wheat stalks about 2 to 4 weeks postanthesis led to rapid translocation into the spike and accumulation of label in developing kernels, especially the bran fraction. With myo-[2-³H]inositol, about 50 to 60% of the label was incorporated into high molecular weight cell wall substance in the region of the injection. That portion translocated to the kernels was utilized primarily for cell wall polysaccharide formation and phytate biosynthesis. A small amount was recovered as free myo-inositol and galactinol. When scyllo-[R-³H]inositol was supplied, most of the label was translocated into the developing kernels where it accumulated as free scyllo-inositol and O--D-galactopyranosyl-scyllo-inositol in approximately equal amount. None of the label from scyllo-[R-³H]inositol was utilized for either phytate biosynthesis or cell wall polysaccharide formation.

¹ This research was supported by Grant GM-22427 from the National Institute of General Medical Sciences, National Institutes of Health, United States Public Health Service. Scientific Paper No. 5586, Project 0266, College of Agriculture Research Center, Washington State University, Pullman, Washington 99164.

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