Table 1.
Growth parameters, fresh biomass, dry biomass and leaf dry matter content 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 | Leaf area (cm2 plant−1) |
Leaf number (no. plant−1) |
Fresh biomass (g plant−1) |
Dry biomass (g plant−1) |
Dry matter (%) |
|---|---|---|---|---|---|
| Cultivar (C) | |||||
| Green Salanova | 1,193 ± 16.5 | 59 ± 0.79 a | 78.55 ± 1.13 | 4.32 ± 0.05 a | 5.48 ± 0.06 a |
| Red Salanova | 1,147 ± 21.8 | 55 ± 0.69 b | 76.95 ± 1.65 | 3.96 ± 0.06 b | 5.19 ± 0.06 b |
| t-test | ns | *** | ns | *** | *** |
| Selenium (µM Se) (S) | |||||
| 0 | 1,253 ± 27.8 | 57 ± 1.26 | 84.33 ± 1.71 | 4.26 ± 0.15 ab | 5.06 ± 0.07 d |
| 8 | 1,141 ± 18.0 | 56 ± 1.37 | 76.69 ± 1.47 | 4.04 ± 0.06 b | 5.28 ± 0.06 bc |
| 16 | 1,192 ± 25.6 | 57 ± 1.46 | 80.04 ± 0.95 | 4.15 ± 0.08 ab | 5.18 ± 0.10 cd |
| 24 | 1,186 ± 8.3 | 57 ± 1.02 | 80.46 ± 1.84 | 4.37 ± 0.06 a | 5.33 ± 0.08 bc |
| 32 | 1,121 ± 37.7 | 56 ± 2.15 | 74.87 ± 1.46 | 4.03 ± 0.13 b | 5.44 ± 0.06 b |
| 40 | 1,127 ± 49.8 | 60 ± 2.23 | 70.09 ± 2.35 | 4.01 ± 0.19 b | 5.71 ± 0.09 a |
| ** | ns | *** | * | *** | |
| C x S | |||||
| Green Salanova × 0 µM Se | 1,207 ± 29.6 ab | 59 ± 1.02 | 86.29 ± 1.47 a | 4.48 ± 0.12 | 5.19 ± 0.07 |
| Green Salanova × 8 µM Se | 1,126 ± 21.2 bcd | 58 ± 0.85 | 75.72 ± 2.88 cd | 4.07 ± 0.10 | 5.38 ± 0.07 |
| Green Salanova × 16 µM Se | 1,236 ± 22.6 ab | 59 ± 1.76 | 79.30 ± 1.85 bcd | 4.26 ± 0.10 | 5.38 ± 0.09 |
| Green Salanova × 24 µM Se | 1,201 ± 6.2 ab | 57 ± 1.02 | 78.08 ± 1.71 bcd | 4.48 ± 0.02 | 5.50 ± 0.02 |
| Green Salanova × 32 µM Se | 1,169 ± 66.9 bc | 58 ± 3.00 | 76.90 ± 2.42 bcd | 4.23 ± 0.20 | 5.53 ± 0.10 |
| Green Salanova × 40 µM Se | 1,219 ± 59.8 ab | 64 ± 0.93 | 74.99 ± 0.97 cd | 4.41 ± 0.09 | 5.88 ± 0.12 |
| Red Salanova × 0 µM Se | 1,299 ± 29.5 a | 55 ± 1.19 | 82.37 ± 2.93 ab | 4.05 ± 0.23 | 4.94 ± 0.08 |
| Red Salanova × 8 µM Se | 1,157 ± 30.4 bc | 53 ± 1.47 | 77.67 ± 1.26 bcd | 4.01 ± 0.08 | 5.17 ± 0.06 |
| Red Salanova × 16 µM Se | 1,147 ± 27.5 bc | 55 ± 1.35 | 80.78 ± 0.76 abc | 4.03 ± 0.11 | 4.99 ± 0.09 |
| Red Salanova × 24 µM Se | 1,172 ± 9.3 bc | 57 ± 2.04 | 82.84 ± 2.87 ab | 4.27 ± 0.08 | 5.17 ± 0.09 |
| Red Salanova × 32 µM Se | 1,074 ± 18.1 cd | 53 ± 2.92 | 72.84 ± 0.86 d | 3.82 ± 0.05 | 5.35 ± 0.05 |
| Red Salanova × 40 µM Se | 1,036 ± 21.8 d | 55 ± 1.11 | 65.20 ± 1.67 e | 3.61 ± 0.07 | 5.54 ± 0.03 |
| ** | 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.