Abstract: In soybean seed, about 60%-80% phosphorous (P) is stored as phytic acid, which is believed as an important anti-nutrition factor to human being and non-ruminant livestock. In this study, two soybean mutant lines, LPA-4297 and LPA-1216, with high inorganic P in seeds, were induced and isolated for the first time from Chinese soybean germplasm by using 60Co gamma rays irradiation. Preliminary observations on agronomic characters of the mutants in parallel with their parents were also made. Based on the changes of P composition in mutant seeds, and according to similar findings in already known low phytate mutants in crops including soybean, it is considered that the mutation in LPA-4297 is similar to the type1 low phytate mutation (lpa1), and that in LPA-1216 is similar to type 2 mutation (lpa2).

Key words: Soybean (Glycine max), High inorganic phosphorus, Mutants, Nutritional quality