Table 2.
Changes in Ψw, total chlorophyll and biomass of B. napus ‘Mosa’ and ‘Saturnin’ under control or PEG-induced drought stress condition for 72 h.
| Physiological parameters/Treatment |
Hours after treatment |
||||
|---|---|---|---|---|---|
| 0 | 24 | 48 | 72 | ||
| Leaf water potential (Ψw, MPa) | |||||
| Mosa | control | -0.41 ± 0.04a | -0.42 ± 0.05a | -0.42 ± 0.05a | -0.42 ± 0.04a |
| PEG-stressed | -0.70 ± 0.09b | -0.95 ± 0.10b | -1.26 ± 0.09c | ||
| Saturnin | control | -0.45 ± 0.07a | -0.44 ± 0.06a | -0.42 ± 0.03a | -0.44 ± 0.06a |
| PEG-stressed | -0.68 ± 0.13b | -0.86 ± 0.08b | -1.02 ± 0.11b | ||
| Total chlorophyll content (mg g-1 FW) | |||||
| Mosa | control | 2.85 ± 0.07b | 3.15 ± 0.28ab | 3.17 ± 0.61a | 2.99 ± 0.39a |
| PEG-stressed | 2.55 ± 0.32c | 1.44 ± 0.11b | 0.88 ± 0.14c | ||
| Saturnin | control | 3.28 ± 0.17a | 3.28 ± 0.12a | 3.47 ± 0.04a | 3.38 ± 0.31a |
| PEG-stressed | 2.71 ± 0.04bc | 1.92 ± 0.09b | 1.36 ± 0.07b | ||
| Biomass (g plant-1) | |||||
| Leaves | |||||
| Mosa | control | 9.78 ± 0.65b | 9.32 ± 0.21b | 9.44 ± 0.34bc | 9.43 ± 0.41b |
| PEG-stressed | 9.21 ± 0.56b | 8.57 ± 0.21c | 7.56 ± 0.38c | ||
| Saturnin | control | 11.87 ± 0.33a | 11.78 ± 0.54a | 11.84 ± 1.12a | 12.17 ± 0.57a |
| PEG-stressed | 11.68 ± 0.95a | 10.79 ± 0.81ab | 11.00 ± 0.74a | ||
| Roots | |||||
| Mosa | control | 4.79 ± 0.25b | 4.82 ± 0.34a | 5.28 ± 0.40a | 5.05 ± 0.12a |
| PEG-stressed | 4.75 ± 0.08a | 5.25 ± 0.45a | 5.45 ± 0.37a | ||
| Saturnin | control | 5.63 ± 0.36a | 5.66 ± 0.45a | 5.88 ± 0.57a | 5.72 ± 0.52a |
| PEG-stressed | 5.65 ± 0.48a | 5.65 ± 0.51a | 5.78 ± 0.42a | ||
Values are means ± SD of three replicates. Values in a vertical column followed by different letters are significantly different at P < 0.05 according to Duncan’s multiple range test.