Table 2.
Effect of PGPR on P, root P uptake, specific P uptake, total free amino acids (TAA), and proline concentrations in young leaves and roots at low P applications.
| P Level (mg L−1) |
PGPR | P (mg g−1) | Root P Uptake (mg plant−1) |
Specific P Uptake (µg P cm−2) |
TAA (mg g−1) | Proline (µmol g−1) | |||
|---|---|---|---|---|---|---|---|---|---|
| Leaves | Roots | Leaves | Roots | Leaves | Roots | ||||
| 0 | −PGPR | 1.7 ± 0.2 b | 2.1 ± 0.1 a | 1.1 ± 0.1 b | n.d. | 79.0 ± 8.3 a | 71.6 ± 7.8 a | 30.2 ± 2.6 | 5.7 ± 0.3 |
| +M | 2.4 ± 0.1 a | 2.3 ± 0.1 a | 7.2 ± 0.4 a | 2.6 ± 0.2 | 90.1 ± 3.9 a | 37.6 ± 4.1 b | 23.1 ± 1.1 | 6.3 ± 0.8 | |
| +PGPR | 2.3 ± 0.1 a | 1.9 ± 0.1 b | 9.2 ± 0.9 a | 2.7 ± 0.6 | 54.0 ± 8.7 b | 67.0 ± 9.3 a | 23.2 ± 1.8 | 8.0 ± 0.5 | |
| 1 | −PGPR | 4.3 ± 0.1 a | 2.7 ± 0.2 | 15.6 ± 1.3 | 3.9 ± 0.3 | 58.3 ± 3.9 | 24.5 ± 0.7 b | 20.7 ± 1.4 | 6.5 ± 1.0 |
| +PGPR | 3.5 ± 0.1 b | 2.5 ± 0.2 | 12.4 ± 1.0 | 3.6 ± 0.3 | 58.2 ± 3.3 | 82.4 ± 2.3 a | 20.5 ± 1.1 | 6.5 ± 0.0 | |
| 2 | −PGPR | 4.9 ± 0.3 | 3.6 ± 0.4 | 22.7 ± 4.1 | 4.4 ± 0.5 | 57.5 ± 12.5 | 32.1 ± 3.3 | 16.9 ± 0.4 | 4.5 ± 0.6 |
| +PGPR | 4.6 ± 0.2 | 3.8 ± 0.2 | 20.3 ± 1.8 | 5.5 ± 0.6 | 42.5 ± 4.4 | 45.1 ± 7.7 | 19.7 ± 0.6 | 5.1 ± 0.3 | |
Mean ± SE with different letters in the same column and same P level are significantly different at p ≤ 0.05 by Tukey’s HSD test. No indication means non-significant difference. M = sterile culture media, n.d. = not determined due to insufficient sample material.