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Phytic Acid Levels in Seeds of Glycine max and G. soja as Influenced by Phosphorus Status
Author(s) -
Raboy Victor,
Dickinson David B.
Publication year - 1993
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1993.0011183x003300060036x
Subject(s) - phytic acid , cultivar , glycine soja , shoot , biology , glycine , phosphorus , germplasm , agronomy , nutrient , horticulture , food science , chemistry , amino acid , biochemistry , ecology , organic chemistry
Improvement in soybean [ Glycine max (L.) Merr.] nutritional quality may be achieved via a reduction in seed phytic acid P. To advance our knowledge of factors that determine seed phytic acid P levels, the relations between external P availability, leaf or shoot P, and seed P fractions (phytic acid and non‐phytic acid P) were studied in soybean and G. soja (Sieb. & Zucc.) germplasm. Mean phytic acid P varied from 4.3 to 6.2 g P kg −1 in mature seeds of 12 soybean cultivars grown under three field environments. Cultivars ranked similarly in each environment and 98% of the variation in phytic acid P was attributable to a positive, linear effect of available soil P. No significant variation was observed in seed non‐phytic acid P. Similar results were obtained when selected soybean and G. soja lines were grown in sand watered with nutrient solutions containing P concentrations ranging from 2 to 50 mg L −1 . Leaf or shoot P concentrations and seed phytic acid P concentrations were positively correlated and in G. soja were nearly double those observed with indeterminate soybean cultivars. The higher leaf P and seed phytic acid P concentrations in G. soja as compared with indeterminate soybean lines were attributed to reduced P utilization efficiency defined as reduced biomass production per unit of total shoot P. These results indicate that essentially all variation in seed P is found as variation in phytic acid P, and that this variation is related to leaf P concentration in a complex manner determined by genotype and soil P availability.