Table 2.
Nitrate, phosphate, sulphate, potassium (K), calcium (Ca), magnesium (Mg) and sodium (Na) concentrations of green and red Salanova lettuce grown hydroponically in a Fitotron open-gas-exchange growth chamber under six Se concentrations applied in the nutrient solution.
| Source of variance | Nitrate (mg kg−1 fw) |
Phosphate (g kg−1 dw) |
Sulphate (g kg−1 dw) |
K (g kg−1 dw) |
Ca (g kg−1 dw) |
Mg (g kg−1dw) |
Na (g kg−1 dw) |
|---|---|---|---|---|---|---|---|
| Cultivar (C) | |||||||
| Green Salanova | 1,810 ± 69 | 14.9 ± 0.37 | 5.7 ± 0.93 | 59.50 ± 1.19 | 6.13 ± 0.09 a | 2.25 ± 0.03 | 0.36 ± 0.012 |
| Red Salanova | 1,272 ± 25 | 14.3 ± 0.37 | 14.8 ± 2.31 | 54.81 ± 0.67 | 5.21 ± 0.11 b | 2.62 ± 0.04 | 0.39 ± 0.029 |
| t-test | *** | ns | *** | ** | *** | *** | ns |
| Selenium (µM Se) (S) | |||||||
| 0 | 1,660 ± 175 | 16.3 ± 0.55 a | 2.9 ± 0.36 | 58.57 ± 3.00 | 5.73 ± 0.35 a | 2.41 ± 0.06 | 0.37 ± 0.039 |
| 8 | 1,480 ± 112 | 15.5 ± 0.21 ab | 3.9 ± 0.63 | 54.75 ± 1.12 | 5.62 ± 0.14 ab | 2.31 ± 0.06 | 0.32 ± 0.010 |
| 16 | 1,680 ± 149 | 15.5 ± 0.06 ab | 6.5 ± 1.38 | 58.71 ± 1.72 | 6.00 ± 0.29 a | 2.52 ± 0.10 | 0.36 ± 0.013 |
| 24 | 1,704 ± 168 | 14.7 ± 0.15 b | 10.5 ± 2.67 | 60.04 ± 1.56 | 5.68 ± 0.18 a | 2.47 ± 0.11 | 0.35 ± 0.011 |
| 32 | 1,487 ± 111 | 13.1 ± 0.43 c | 17.7 ± 4.14 | 58.18 ± 1.19 | 5.80 ± 0.23 a | 2.51 ± 0.13 | 0.44 ± 0.076 |
| 40 | 1,234 ± 64 | 12.5 ± 0.28 c | 20.0 ± 3.12 | 52.69 ± 0.84 | 5.21 ± 0.28 b | 2.39 ± 0.13 | 0.42 ± 0.033 |
| *** | *** | *** | * | * | * | ns | |
| C x S | |||||||
| Green Salanova × 0 µM Se | 2,011 ± 168 a | 16.9 ± 1.01 | 2.1 ± 0.24 f | 63.49 ± 4.54 a | 6.34 ± 0.37 | 2.40 ± 0.11 bc | 0.44 ± 0.043 bc |
| Green Salanova × 8 µM Se | 1,718 ± 68 b | 15.3 ± 0.37 | 2.5 ± 0.06 f | 56.89 ± 0.69 cd | 5.86 ± 0.14 | 2.17 ± 0.03 d | 0.34 ± 0.005 cd |
| Green Salanova × 16 µM Se | 2,011 ± 30 a | 15.5 ± 0.06 | 3.4 ± 0.18 ef | 62.52 ± 0.36 ab | 6.49 ± 0.23 | 2.31 ± 0.06 bcd | 0.37 ± 0.023 bcd |
| Green Salanova × 24 µM Se | 2,074 ± 46 a | 14.9 ± 0.31 | 4.5 ± 0.09 e | 63.38 ± 0.94 a | 6.04 ± 0.10 | 2.22 ± 0.04 cd | 0.35 ± 0.017 cd |
| Green Salanova × 32 µM Se | 1,681 ± 148 b | 13.7 ± 0.74 | 9.4 ± 0.45 d | 57.83 ± 1.56 bcd | 6.29 ± 0.08 | 2.22 ± 0.02 cd | 0.31 ± 0.011 d |
| Green Salanova × 40 µM Se | 1,366 ± 36 c | 12.9 ± 0.21 | 12.3 ± 1.05 c | 52.91 ± 1.15 d | 5.74 ± 0.07 | 2.15 ± 0.03 d | 0.36 ± 0.016 bcd |
| Red Salanova × 0 µM Se | 1,309 ± 36 cd | 15.7 ± 0.34 | 3.6 ± 0.18 ef | 53.66 ± 0.39 cd | 5.11 ± 0.30 | 2.42 ± 0.07 bc | 0.29 ± 0.010 d |
| Red Salanova × 8 µM Se | 1,242 ± 41 cd | 15.6 ± 0.34 | 5.3 ± 0.15 e | 52.62 ± 1.10 d | 5.37 ± 0.12 | 2.44 ± 0.04 b | 0.30 ± 0.012 d |
| Red Salanova × 16 µM Se | 1,349 ± 10 cd | 15.5 ± 0.09 | 9.6 ± 0.15 d | 54.89 ± 0.29 cd | 5.51 ± 0.37 | 2.73 ± 0.05 a | 0.35 ± 0.015 bcd |
| Red Salanova × 24 µM Se | 1,334 ± 54 cd | 14.6 ± 0.06 | 16.4 ± 0.51 b | 56.70 ± 0.31 cd | 5.32 ± 0.17 | 2.72 ± 0.01 a | 0.36 ± 0.016 bcd |
| Red Salanova × 32 µM Se | 1,293 ± 47 cd | 12.6 ± 0.28 | 26.1 ± 1.56 a | 58.53 ± 2.14 abc | 5.30 ± 0.11 | 2.80 ± 0.03 a | 0.57 ± 0.112 a |
| Red Salanova × 40 µM Se | 1,103 ± 45 d | 12.0 ± 0.40 | 27.6 ± 0.39 a | 52.47 ± 1.48 d | 4.68 ± 0.33 | 2.64 ± 0.15 a | 0.48 ± 0.038 ab |
| * | ns | *** | * | ns | ** | ns |
ns,*,**, *** Non-significant or significant at P ≤ 0.05, 0.01, and 0.001, respectively. In the absence of interaction, cultivar means were compared by t-Test and Se application means by Duncan’s multiple-range test (P = 0.05). Different letters within each column indicate significantly different means. All data are expressed as mean ± SE, n = 3.