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Crop Science 40:1601-1605 (2000)
© 2000 Crop Science Society of America

CROP BREEDING, GENETICS & CYTOLOGY

Isolation of High Seed Inorganic P, Low-Phytate Soybean Mutants

James R. Wilcoxa, Gnanasiri S. Premachandrab, Kevin A. Youngc and Victor Raboyc

a USDA-ARS, Crop Production and Pathology Research and Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907-1150 USA
b Dep. of Agronomy, Purdue Univ., Aberdeen, ID USA
c USDA-ARS, Small Grain and Potato Germplasm Research, 1691 South 2700 West, Aberdeen, ID 83210 USA

jwilcox{at}purdue.edu

Phosphorous in soybean [Glycine max (L.) Merr.] seed is stored primarily as phytic acid, which is nutritionally unavailable to nonruminant livestock. The objective of this study was to isolate mutations that reduce soybean seed phytic acid P and increase seed inorganic P. Following treatment with ethyl methanesulfonate, M2 through M6 plants were screened for high seed inorganic P. Seeds of M2 plants high in inorganic P produced progenies high in inorganic P through the M6 generation. M6 progenies of one plant averaged 6.84 g kg-1 seed phytic acid and inorganic P varied from 2.34 to 4.41 g kg-1 or 60 to 66% of phytic acid P plus inorganic P. M6 progenies of a second plant averaged 10.89 g kg-1 phytic acid and varied from 1.21 to 3.84 g kg-1 inorganic P, representing from 47 to 51% of the sum of phytic acid P plus inorganic P. In contrast, nonmutant seeds of the check cultivar Athow contained 15.33 g kg-1 phytic acid and averaged 0.74 g kg-1 inorganic P, representing 15% of the sum of phytic acid P plus inorganic P. Low phytic acid and high inorganic P in these progenies should increase the nutritional value of soy meal and reduce excess P in livestock manure.




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