Table 5.
Proline, photosynthetic pigments, relative water content and activity of superoxide dismutase of cassava under water stress as influenced by genotype and ascorbic acid treatment
| Treatment | Proline (mg/g) | Chl. a (mg/g) | Chl. b (mg/g) | Carotenoids (mg/g) | SOD (U/mg) | RWC (%) |
|---|---|---|---|---|---|---|
| Genotype | ||||||
| TMS 0040 | 0.7 ± 0.0a | 5.0 ± 0.8b | 12.7 ± 1.1b | 1.8 ± 0.5a | 1.7 ± 0.0b | 94.8 ± 3.5b |
| TMS 581 | 0.6 ± 0.0b | 5.6 ± 0.7a | 14.1 ± 1.1a | 2.0 ± 0.7a | 1.8 ± 0.0a | 95.9 ± 2.7a |
| Stress | ||||||
| WS | 0.4 ± 0.0d | 17.2 ± 2.8a | 7.8 ± 1.7a | 2.2 ± 0.5a | 1.2 ± 0.0c | 98.8 ± 2.3a |
| ST0 | 0.8 ± 0.1a | 6.2 ± 1.2c | 3.2 ± 0.8c | 0.5 ± 0.1c | 1.5 ± 0.0b | 92.0 ± 2.1d |
| ST1 | 0.5 ± 0.0c | 14.6 ± 2.6b | 5.2 ± 0.7b | 1.5 ± 0.0b | 1.7 ± 0.0a | 94.4 ± 1.8c |
| ST2 | 0.4 ± 0.0d | 15.2 ± 3.2b | 6.0 ± 1.1b | 1.7 ± 0.0b | 1.8 ± 0.1a | 96.8 ± 2.7b |
| ST3 | 0.5 ± 0.0c | 14.5 ± 2.9b | 6.1 ± 1.0b | 1.5 ± 0.1b | 1.5 ± 0.0b | 92.1 ± 2.8d |
| ST4 | 0.6 ± 0.0b | 13.6 ± 3.1b | 5.8 ± 1.2b | 1.5 ± 0.0b | 1.5 ± 0.0b | 94.2 ± 2.6c |
LA leaf area, Chl. a chlorophyll a, Chl. b chlorophyll b
Values are means (± SD) of three experiments. Each experiment has three replicates. Means followed by different letters within a column under each treatment are significantly different at 5% probability level according to Tukey’s Test. TMS 0040-IITA-TMS-IBA010040 (drought sensitive), TMS 581-IITA-TMS-IBA980581 (drought tolerant)