Table 5.
Effects of selenate treatment on the content of selected amino acids in leaves and roots of radish plants cultivated in hydroponics.
| Amino acid (% w/w) | Leaves | ||||
|---|---|---|---|---|---|
| Se treatment (μM) | |||||
| 0 | 5 | 10 | 20 | 40 | |
| Phenylalanine | 3.36 ± 0.48a | 1.79 ± 0.17c | 2.71 ± 0.48b | 2.21 ± 0.32bc | 1.68 ± 0.24c |
| Isoleucine | 0.49 ± 0.11a | 0.71 ± 0.14a | 0.58 ± 0.05a | 0.62 ± 0.15a | 0.12 ± 0.02b |
| Leucine | 0.50 ± 0.07a | 0.46 ± 0.03a | 0.50 ± 0.01a | 0.38 ± 0.02b | 0.28 ± 0.04b |
| Histidine | 2.17 ± 0.11b | 2.63 ± 0.15a | 2.60 ± 0.06a | 2.88 ± 0.15a | 2.84 ± 0.08a |
| Tyrosine | 0.65 ± 0.08a | 0.35 ± 0.05b | 0.47 ± 0.07b | 0.49 ± 0.06b | 0.32 ± 0.03c |
| Tryptophan | 1.24 ± 0.16a | 0.72 ± 0.12b | 0.58 ± 0.21b | 0.58 ± 0.43b | 0.51 ± 0.10b |
| Asparagine | 1.38 ± 0.15a | 1.45 ± 1.25a | 1.54 ± 0.17a | 1.47 ± 0.08a | 1.66 ± 0.23a |
| Glutamine | 25.44 ± 1.34a | 22.36 ± 1.53ab | 21.31 ± 0.74b | 23.91 ± 1.85ab | 26.98 ± 2.64a |
| Valine | 3.19 ± 0.09a | 2.14 ± 0.25b | 2.55 ± 0.44b | 2.21 ± 0.11b | 1.69 ± 0.40b |
| Proline | 12.15 ± 0.96c | 13.32 ± 2.43c | 19.70 ± 3.14b | 23.99 ± 4.43ab | 27.05 ± 1.81a |
| Methionine | 0.25 ± 0.02a | 0.19 ± 0.01b | 0.25 ± 0.05a | 0.19 ± 0.03ab | 0.16 ± 0.05b |
| Se-methylselenocysteine | − | 1.15 ± 0.49a | 1.63 ± 0.48a | 1.24 ± 0.66a | 1.52 ± 0.21a |
| Se-cysteine | − | − | − | − | − |
| Se-methionine | − | − | − | − | − |
| Total | 50.82 ± 2.16b | 47.27 ± 2.03b | 54.42 ± 2.00b | 60.17 ± 3.17a | 64.81 ± 3.14a |
| Amino acid (% w/w) | Roots | ||||
| Se treatment (μM) | |||||
| 0 | 5 | 10 | 20 | 40 | |
| Phenylalanine | 5.58 ± 0.56a | 5.69 ± 0.16a | 6.05 ± 0.70a | 4.74 ± 0.22b | 5.42 ± 0.65ab |
| Isoleucine | 5.95 ± 1.66ab | 7.34 ± 0.78a | 7.25 ± 1.03a | 4.33 ± 0.65b | 4.16 ± 1.26b |
| Leucine | 1.44 ± 0.26b | 2.20 ± 0.10a | 2.24 ± 0.45ab | 1.57 ± 0.16b | 2.07 ± 0.46ab |
| Histidine | 1.83 ± 0.44b | 2.72 ± 0.36a | 2.48 ± 0.32a | 2.43 ± 0.31a | 2.54 ± 0.50a |
| Tyrosine | 1.05 ± 0.15a | 1.26 ± 0.16a | 1.16 ± 0.21a | 0.91 ± 0.24a | 1.03 ± 0.25a |
| Tryptophan | 2.33 ± 0.47ab | 2.67 ± 0.09a | 2.58 ± 0.35ab | 2.03 ± 0.32ab | 1.71 ± 0.42b |
| Asparagine | 1.65 ± 0.48a | 1.51 ± 0.22a | 1.31 ± 0.15a | 1.48 ± 0.14a | 1.89 ± 0.35a |
| Glutamine | 21.10 ± 2.07a | 20.14 ± 1.64a | 25.30 ± 4.72a | 21.28 ± 3.09ab | 22.66 ± 2.28a |
| Valine | 11.40 ± 1.23ab | 14.41 ± 1.79a | 13.76 ± 2.25a | 8.61 ± 1.30b | 8.40 ± 1.78b |
| Proline | 50.06 ± 3.42c | 43.45 ± 2.10c | 43.03 ± 1.40b | 39.44 ± 4.14ab | 24.19 ± 3.65a |
| Methionine | 0.86 ± 0.17b | 1.31 ± 0.14a | 1.25 ± 0.17a | 0.79 ± 0.11b | 1.12 ± 0.22b |
| Se-methylselenocysteine | − | 0.75 ± 0.06b | 1.51 ± 0.33a | 1.05 ± 0.12a | 1.27 ± 0.35a |
| Se-cysteine | − | − | − | − | − |
| Se-methionine | − | − | − | − | − |
| Total | 103.2 ± 2.9a | 102.4 ± 2.2a | 100.9 ± 3.1a | 88.6 ± 3.6b | 76.5 ± 2.0c |
Data are expressed as mg amino acid per 100 mg tissue fresh weight (FW). Different letters along rows indicate significant differences (n = 5, ±STD, p < 0.05) among treatments.