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ARS Home » Southeast Area » Raleigh, North Carolina » Soybean and Nitrogen Fixation Research » Research » Publications at this Location » Publication #152207
Title: INFLUENCE OF PHOSPHORUS NITRITION ON EXPRESSION OF THE LOW SEED PHYTIC ACID TRAIT IN SOYBEAN

Author
item Israel, Daniel
item Kwanyuen, Prachuab
item Burton, Joseph

Submitted to: American Society of Agronomy Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 8/20/2003
Publication Date: 11/20/2003
Citation: Israel, D.W., Kwanyuen, P., Burton, J.W. 2003. Influence of phosphorus nitrition on expression of the low seed phytic acid trait in soybean [abstract]. American Society of Agronomy Meetings, Denver, CO, Nov. 2-6.

Interpretive Summary:

Technical Abstract: Nutritional and waste management benefits make introduction of the low seed phytic acid trait into adapted soybean germplasm a goal of plant breeders. Before investing resources in such an effort, the impact of P nutrition on expression of the low phytic acid (lpa)trait must be investigated. The impact of different levels of P nutrition (deficient, 0.1 mM P; optimal, 0.34 mM P and supra optimal, 0.68 mM P) on concs. of phytic acid P, inorganic P and total P in seed of low (CX1834 1 3 and CX1834A 1 4) and normal (CX1834A 1 1) seed phytic acid genotypes was evaluated. Total P concs.in seed of the normal phytic acid genotype increased from 4.5 to 7.5 mg P/gdw as the P supply increased from deficient to supra optimal levels. All of this increase was associated with accumulation of phytic acid P. The inorganic P conc. in seed did not change with increasing P supply. Total P concs in seed of lpa genotypes increased from 4 to 7.2 mg P/gdw with increasing external P supply. However, phytic acid P concs. in seed of lpa genotypes increased only slightly (0.38 mg P/gdw) as external P increased to supra optimal levels. In contrast, the inorganic P conc. in seed of lpa genotypes increased from 0.9 to 3.6 mg P/gdw between deficient and supra optimal P levels accounting for 85% of the increase in total P conc. Stability of the lpa trait to variable P nutrition shows that introducing it into adapted germplasm is a reasonable breeding goal.