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Wheat kernels from myo-[2-(3)H]inositol- or scyllo-[R-(3)H]inositol-labeled plants (Sasaki and Loewus 1980 Plant Physiol 66: 740-745) were used to study redistribution of (3)H into growing regions during germination. Most of the labeled 1-alpha-galactinol (or the analogous scyllo-inositol galactoside) was hydrolyzed within 1 day. Water-soluble phytate was dephosphorylated within 3 days. A large reserve of bound phytate continued to release myo-inositol over several days. Translocation of free myo-inositol to growing regions provided substrate for the myo-inositol oxidation pathway and incorporation of (3)H into new cell wall polysaccharides.Cell wall polysaccharides in the kernel were degraded during germination. The labeled residues were translocated to growing regions and reutilized for new cell wall formation. Pentosyl residues accounted for most of this label.Free scyllo-inositol followed a path of translocation from kernel to seedling similar to that of myo-inositol. Unlike myo-inositol, it did not furnish substrate for the myo-inositol oxidation pathway but accumulated as free scyllo-inositol in the seedling.The fate of phytate-derived myo-inositol during germination of wheat is discussed in relation to a recent scheme of phytate metabolism proposed by De and Biswas (1979 J Biol Chem 254: 8717-8719) for germinating mung bean seedlings.

plant physiology

Redistribution of Tritium during Germination of Grain Harvested from myo-[2-3H]Inositol- and scyllo-[R-3H]Inositol-Labeled Wheat