Table I.
Component fluxes of NH4+ as estimated from compartmental analysis (for derivation of flux parameters and symbols, see text)
| Pretreatment O2 | NH4+ Fluxes
|
||||
|---|---|---|---|---|---|
| φoc | φco | φnet | φvac./ass. | φxylem | |
| μmol g−1 h−1 | |||||
| 100% (control) | 3.97 ± 0.42 | 0.95 ± 0.17 (23) | 3.02 ± 0.36 (77) | 2.04 ± 0.13 (52) | 0.97 ± 0.07 (25) |
| 15% (1 d) | 4.02 ± 0.37 | 0.96 ± 0.11 (24) | 3.06 ± 0.33 (76) | 1.81 ± 0.04 (45) | 1.25 ± 0.17 (31) |
| 15% (3 d) | 2.78 ± 0.41 | 0.43 ± 0.02 (16) | 2.35 ± 0.38 (84) | 0.96 ± 0.09 (34) | 1.39 ± 0.08 (50) |
| 15% (5 d) | 2.12 ± 0.19 | 0.35 ± 0.02 (17) | 1.77 ± 0.14 (83) | 1.31 ± 0.07 (62) | 0.46 ± 0.11 (21) |
Rice seedlings were grown under steady-state nutritional conditions for 3 weeks prior to conducting efflux experiments. For each flux component, the respective percentage of influx is indicated in parentheses. Data are means ± se (n ≥ 6).