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Variation in Seed Total Phosphorus, Phytic Acid, Zinc, Calcium, Magnesium, and Protein among Lines of Glycine max and G. soja¹

Analysis of 163 soybean [Glycine max (L.) Merr.] lines was conducted to identify lines that had either a high or low concentration of phytic acid (PA). Several of these lines, along with additional soybean lines of interest, and 20 G. soja (Sieb. & Zucc.) lines, were evaluated in the field in 1982. Extensive variation in seed mineral accumulation was observed among the soybean lines (ranges were approximately 50% of the species means), and among the G. soja lines (ranges were approximately 35% of the species means). Among soybean lines, PA and seed total P were highly correlated (r=0.94), as were total P and PA with protein (r=0.74 for both relationships), and total P and PA with (r=0.63 and r=0.58, respectively). In some instances soybean lines with similar levels of total P had significantly different levels of PA. The concentration of PA, total P, Zn, and Ca was approximately 30% greater in seeds of G. soja lines than in soybean seeds. For soybean lines grown in the field trial, mean PA, seed total P, Zn, Ca, and protein were 17.6 g kg^–1, 6.9 g kg^–1, 52 mg kg^–1, 2.7 g kg^–1, and 408 g kg^–1 respectively, and for the G. soja lines mean values were 22.9 g kg^–1, 9.4 g kg^–1, 69 mg kg^–1, 3.4 g kg^–1, and 474 g kg^–1 respectively. Seed Mg averaged 2.7 g kg^–1 among all Glycine lines, with little observed variation. Soybean lines high in an individual mineral tended to be high in most minerals studied. Among G. soja lines, only two relationships, seed total P:PA and PA:protein, were statistically significant.

Key Words: Nutritional quality • myo-inositol hexakis phosphate • Soybean

² Graduate research assistant and professor, Dep. of Horticulture, and graduate research assistant, Dep. of Agronomy, Univ. of Illinois.

Received for publication June 6, 1983.