Table 1.
Comparison of the ratios of concentrations of nitrogen compounds in soybean roots and nodules treated with 5 mM of nitrate for 24 h and the control plants.
| Nitrogen Compound | Roots | Nodules |
|---|---|---|
| Allantoic acid | 3.1 *** | 1.4 * |
| Glutamine | 2.4 * | 1.6 * |
| Asparagine | 2.1 * | 3.3 |
| Alanine | 2.0 *** | 0.9 |
| Homoserine | 2.8 * | 0.8 |
| 2-Aminobutyric acid | 1.9 ** | 0.8 * |
| Glutamic acid | 1.8 ** | 1.1 |
| Aspartic acid | 1.8 * | 1.4 * |
| Allantoin | 1.0 | 1.9 ** |
| N-Acetylglucosamine | 1.1 | 3.6 * |
Notes: The symbol (*, **, ***) after each number indicates the statistical significance of the metabolite concentration between the nitrate treatment and control at p < 0.05, 0.01, 0.001 levels by Welch’s t-test. Red color stands for Ratio (Nitrate/Control) > 3; Orange stands for 2 ≤ Ratio (Nitrate/Control) ≤ 3; Yellow stands for 1 ≤ Ratio (Nitrate/Control) < 2; Blue stands for Ratio (Nitrate/Control) < 1.