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Metabolism and Enzymology

Galactinol Synthase Activity and Soluble Sugars in Developing Seeds of Four Soybean Genotypes ¹

Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina 27695-7609, Department of Crop Science and United States Department of Agriculture, North Carolina State University, Raleigh, North Carolina 27695-7609

Galactinol synthase (UDP-galactose:inositol galactosyltransferase) is the first unique enzyme in the biosynthetic pathway of raffinose saccharides. Its role as a regulator of carbon partitioning between sucrose and raffinose saccharides in developing soybean (Glycine max L. Merrill) seeds was examined. Galactinol synthase activity and concentrations of sucrose, stachyose, and raffinose were compared during seed development between two genotypes that were high and two genotypes that were low in mature seed raffinose saccharide concentration. In all genotypes, sucrose concentration increased as seed development progressed, but in both low raffinose saccharide genotypes, greater increases in sucrose concentration were observed late in seed development. Sucrose to stachyose ratios in mature seeds were 2.3-fold greater in low raffinose saccharide genotypes than in the high raffinose saccharide genotypes. During seed development, higher levels of galactinol synthase activity were observed in the high raffinose saccharide genotypes than in the low raffinose saccharide genotypes. A common linear relationship for all four soybean genotypes was shown to exist between galactinol formed estimated from galactinol synthase activity data and the concentration of galactose present in raffinose saccharides. Results of this study implied that galactinol synthase is an important regulator of carbon partitioning between sucrose and raffinose saccharides in developing soybean seeds.

¹ Cooperative investigations of the North Carolina Agricultural Research Service. Raleigh and the United States Department of Agriculture, Agricultural Research Service. Paper No. 10540 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, NC 27695-7601.

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