Table 1.
Effect of different concentrations of Pb (0.25 mM, 0.50 mM, and 0.75 mM) and the combination of EBL (10–7 M) and SA (1 mM) on net photosynthetic rate and stomatal conductance of 30-, 60-, and 90-day-old plants of B. juncea L. **: P < 0.01.
| Treatment | Net photosynthetic rate (µmol m2 s–1) (mean ± SD) | Stomatal conductance (mmol CO m2 s–1) (mean ± SD) | ||||||
|---|---|---|---|---|---|---|---|---|
| Pb | EBL | SA | 30 DAS | 60 DAS | 90 DAS | 30 DAS | 60 DAS | 90 DAS |
| 0 | 0 | 0 | 13.23 ± 0.252 | 22.83 ± 0.702 | 38.23 ± 0.153 | 0.305 ± 0.004 | 0.504 ± 0.003 | 0.416 ± 0.005 |
| 0 | 10–7 M | 0 | 14.33 ± 0.252 | 29.53 ± 0.351 | 45.90 ± 0.361 | 0.320 ± 0.002 | 0.534 ± 0.003 | 0.455 ± 0.005 |
| 0 | 0 | 1 mM | 13.97 ± 0.208 | 25.90 ± 0.265 | 42.13 ± 0.569 | 0.308 ± 0.003 | 0.528 ± 0.006 | 0.432 ± 0.003 |
| 0 | 10–7 M | 1 mM | 16.63 ± 0.306 | 37.83 ± 0.503 | 53.47 ± 0.603 | 0.327 ± 0.004 | 0.552 ± 0.004 | 0.495 ± 0.004 |
| 0.25 mM | 0 | 0 | 8.87 ± 0.351 | 21.60 ± 0.361 | 33.63 ± 0.231 | 0.247 ± 0.003 | 0.490 ± 0.005 | 0.393 ± 0.002 |
| 0.25 mM | 10–7 M | 0 | 12.23 ± 0.252 | 25.13 ± 0.451 | 42.33 ± 0.961 | 0.274 ± 0.002 | 0.525 ± 0.004 | 0.427 ± 0.006 |
| 0.25 mM | 0 | 1 mM | 11.47 ± 0.351 | 24.03 ± 0.603 | 35.03 ± 0.503 | 0.272 ± 0.003 | 0.515 ± 0.004 | 0.409 ± 0.001 |
| 0.25 mM | 10–7 M | 1 mM | 13.43 ± 0.306 | 27.37 ± 0.611 | 48.10 ± 0.854 | 0.292 ± 0.004 | 0.550 ± 0.003 | 0.393 ± 0.002 |
| 0.50 mM | 0 | 0 | 6.70 ± 0.200 | 18.10 ± 0.400 | 26.73 ± 0.473 | 0.198 ± 0.004 | 0.425 ± 0.003 | 0.323 ± 0.002 |
| 0.50 mM | 10–7 M | 0 | 9.63 ± 0.404 | 22.60 ± 0.656 | 35.20 ± 0.361 | 0.251 ± 0.003 | 0.475 ± 0.005 | 0.374 ± 0.003 |
| 0.50 mM | 0 | 1 mM | 8.50 ± 0.300 | 19.00 ± 0.458 | 31.03 ± 0.416 | 0.233 ± 0.003 | 0.454 ± 0.004 | 0.359 ± 0.004 |
| 0.50 mM | 10–7 M | 1 mM | 10.43 ± 0.208 | 12.83 ± 0.611 | 39.70 ± 0.721 | 0.355 ± 0.004 | 0.487 ± 0.002 | 0.386 ± 0.005 |
| 0.75 mM | 0 | 0 | 4.90 ± 0.361 | 15.53 ± 0.351 | 20.83 ± 0.306 | 0.155 ± 0.001 | 0.416 ± 0.005 | 0.312 ± 0.004 |
| 0.75 mM | 10–7 M | 0 | 7.80 ± 0.265 | 18.03 ± 0.611 | 29.33 ± 0.208 | 0.205 ± 0.004 | 0.434 ± 0.003 | 0.336 ± 0.005 |
| 0.75 mM | 0 | 1 mM | 7.47 ± 0.321 | 15.53 ± 0.351 | 26.00 ± 0.794 | 0.195 ± 0.003 | 0.429 ± 0.004 | 0.327 ± 0.004 |
| 0.75 mM | 10–7 M | 1 mM | 9.53 ± 0.351 | 21.37 ± 0.758 | 34.43 ± 0.833 | 0.297 ± 0.003 | 0.416 ± 0.005 | 0.356 ± 0.004 |
| F-ratio(df 3, 32) treatment | 1324.9** | 1042.9** | 2103.7** | 2465.2** | 1710.5** | 2725.4** | ||
| F-ratio(df 3, 32) dose | 384.5** | 563.3** | 1365.7** | 1768.4** | 314.8** | 643.3** | ||
| F-ratio(df 9, 32) treatment × dose | 7.95** | 38.06** | 10.60** | 239.40** | 11.33** | 16.85** | ||
| HSD | 0.904 | 1.673 | 1.727 | 0.009 | 0.012 | 0.011 | ||