Table 1.
Coefficients of drought tolerance evaluated for each of the six main plant growth variables for the transgenic potato lines overexpression of StPIP1 gene and the check cultivar.
| Genotypea | Daily gain in height (%) | Leaf area expansion rate (%) | Stem thickness expansion rate (%) | Relative water content (%) | Yield per plant (%) | Survival rate (%) |
|---|---|---|---|---|---|---|
| CK | 48.2 ± 1.1 c | 45.3 ± 5.3 b | 53.1 ± 0.9 c | 73.1 ± 1.5 c | 32.4 ± 0.5 f | 58.3 ± 1.0 c |
| T7 | 80.4 ± 0.9 a | 73.6 ± 3.4 ab | 75.2 ± 0.5 ab | 95.1 ± 0.7 a | 74.3 ± 0.3 b | 84.4 ± 1.8 ab |
| T6 | 80.9 ± 1.0 a | 90.0 ± 6.2 a | 82.1 ± 3.2 a | 91.8 ± 1.1 a | 80.8 ± 2.3 a | 85.4 ± 2.1 a |
| T5 | 68.2 ± 0.7 b | 64.1 ± 9.9 ab | 72.6 ± 0.5 b | 83.3 ± 0.9 b | 68.3 ± 0.7 c | 72.9 ± 2.1 b |
| T4 | 62.5 ± 0.5 b | 56.5 ± 1.5 b | 70.4 ± 1.7 b | 82.0 ± 0.4 b | 65.7 ± 0.9 c | 71.9 ± 1.8 b |
| T2 | 47.1 ± 2.2 c | 60.6 ± 5.3 b | 54.2 ± 3.0 c | 83.4 ± 1.3 b | 48.3 ± 0.7 e | 64.6 ± 3.8 bc |
| T1 | 51.3 ± 1.3 c | 58.8 ± 1.9 b | 53.6 ± 1.4 c | 82.3 ± 0.5 b | 55.5 ± 0.5 d | 65.6 ± 3.1 bc |
a
CK is the “Shepody” non-transgenic potato cultivar; the rest are transgenic potato lines. Each value ± standard error was obtained from three runs of moderate and severe stress treatments with three replicates in each run. Within a column, a higher coefficient indicates higher drought tolerance and the different letters denote significant differences at P < 0.05.