| Metabolites | GS activity, units g−1 fr.wt. -Cd +Cd | % Inhibition | |
| None | 18.6 ± 1.5 (100) | 10.4 ± 1 (100) | 44 |
| Glutamine | 17.3 ± 1 (93) | 14.6 ± 2* (140) | 16 |
| Glutamate | 22.9 ± 4 (123) | 11.6 ± 2 (112) | 49 |
| 2-Oxoglutarate | 28.0 ± 2*** (151) | 16.9 ± 3* (163) | 40 |
| GSH | 24.3 ± 2* (131) | 16.8 ± 1* (162) | 31 |
| Sucrose | 28.1 ± 2*** (151) | 23.2 ± 2*** (223) | 17 |