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. 2023 Feb 21;13(3):319. doi: 10.3390/metabo13030319

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Comparison of the concentrations of N metabolites among the organs of the Nod and Non-nod soybean plants treated with the various N compounds: (A,B) NO₃⁻; (C,D) allantoate; (E,F) allantoin; (G,H) Asn; (I,J) Gln; (K,L) Asp; (M,N) Glu; (O,P) urea; (Q,R) NH₄⁺. (A,C,E,G,I,K,M,O,Q) nodulated plants; (B,D,F,H,J,L,N,P,R) non-nodulated plants. Treatments: Cont, control with N-free solution; NO₃⁻, 5 mM KNO₃; NH₄⁺, 2.5 mM (NH₄)₂SO₄; urea, 2.5 mM urea; and NO₃⁻ + NH₄⁺, 2.5 mM KNO₃ + 1.25 mM (NH₄)₂SO₄. n = 3. Average ± standard error. Different letters on the top of the columns indicate significant differences in the N concentrations among the organs based on Tukey’s test (p < 0.05).

Comparison of the concentrations of N metabolites among the organs of the Nod and Non-nod soybean plants treated with the various N compounds: (A,B) NO₃⁻; (C,D) allantoate; (E,F) allantoin; (G,H) Asn; (I,J) Gln; (K,L) Asp; (M,N) Glu; (O,P) urea; (Q,R) NH₄⁺. (A,C,E,G,I,K,M,O,Q) nodulated plants; (B,D,F,H,J,L,N,P,R) non-nodulated plants. Treatments: Cont, control with N-free solution; NO₃⁻, 5 mM KNO₃; NH₄⁺, 2.5 mM (NH₄)₂SO₄; urea, 2.5 mM urea; and NO₃⁻ + NH₄⁺, 2.5 mM KNO₃ + 1.25 mM (NH₄)₂SO₄. n = 3. Average ± standard error. Different letters on the top of the columns indicate significant differences in the N concentrations among the organs based on Tukey’s test (p < 0.05).