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Genetic Variability for Phytic Acid Phosphorus and Inorgaic Phosphorus in Seeds of Soybeans in Maturity Groups V, VI, and VII
Author(s) -
Israel D. W.,
Kwanyuen P.,
Burton J. W.
Publication year - 2006
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/cropsci2005.0076
Subject(s) - phytic acid , cultivar , biology , phosphorus , zoology , genetic variation , gene–environment interaction , glycine , phosphate , genetic variability , meal , genotype , horticulture , food science , biochemistry , amino acid , chemistry , gene , organic chemistry
Phytic acid (PA; myo ‐inositol 1,2,3,4,5,6 hexa kis phosphate) in soybean [ Glycine max (L.) merr.] meal is a major source of P in animal excreta, a serious environmental pollutant. Genetic mutants in which seed PA is reduced by 60% have been developed. The objectives were to assess (i) natural variation in seed PA‐P and inorganic phosphorus (P i ) concentrations in soybean breeding lines and cultivars of Maturity Groups (MGs) V, VI, and VII; (ii) genotype × environment (G × E) interactions for P i and PA‐P, and (iii) relations among PA‐P, P i , and seed protein concentrations. Three sets of cultivars and breeding lines were tested separately in two or three environments. Variation among lines was highly significant, ranging from 3.77 to 5.07 g kg −1 PA‐P and from 0.19 to 0.37 g kg −1 P i The G × E interactions were highly significant for P i concentration, but significant variation for PA‐P concentration was observed only among cultivars, not across environments nor as G × E interactions. Rank correlation coefficients for P i concentrations between environments were large (0.65–0.88), suggesting that the G × E interactions were due to differences in average P i concentration in various environments. Variation in seed protein was highly significant in all three sets, but protein was not correlated with PA‐P and was correlated with P i ( r = 0.56) only in the MG V breeding lines test. Therefore, genetic relationships between protein and either PA‐P or P i could not be established. Significant natural genetic variation indicates that PA level of potential adapted parents may be useful in breeding low‐PA soybeans.