Table 1.
Agronomic and physiological parameters measured during stress application at T2, T4 and T10 and after 4 days of recovery (T14) in wild-type (B73) and hybrid (P26) plants.
| ECS μS cm−1 | Soil ψπ MPa | Shoot dm g | Root dm g | Leaf ψt MPa | Leaf ψπ MPa | An μmol CO2 m−2s−1 | gs mmol H2O m−2s−1 | ΦPSII Efficiency | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| VARIETY | ||||||||||||||||||
| Wild | 4585 | ns | −.31 | ns | 1.48 | b | 1.37 | b | −2.30 | ns | −2.41 | ns | 14.06 | b | 0.10 | b | 0.09 | ns |
| Hybrid | 5675 | ns | −0.35 | ns | 2.90 | a | 2.65 | a | −2.35 | ns | −2.06 | ns | 17.55 | a | 0.12 | a | 0.10 | ns |
| WATER SALINITY | ||||||||||||||||||
| No salt | 1736 | b | −0.24 | a | 2.66 | a | 2.57 | a | −2.27 | ns | −1.91 | a | 21.64 | a | 0.14 | a | 0.12 | a |
| Salt | 8524 | a | −0.43 | b | 1.73 | b | 1.46 | b | −2.37 | ns | −2.55 | b | 9.97 | b | 0.07 | b | 0.06 | b |
| SOIL WATER CONTENT | ||||||||||||||||||
| 60% | 4050 | ns | −0.30 | ns | 1.79 | b | 1.75 | ns | −2.29 | ns | −2.34 | ns | 13.06 | b | 0.09 | b | 0.08 | b |
| 100% | 6209 | ns | −0.36 | ns | 2.60 | a | 2.27 | ns | −2.35 | ns | −2.12 | ns | 18.55 | a | 0.13 | a | 0.11 | a |
| DAY | ||||||||||||||||||
| 2 | 4133 | b | −0.28 | b | 1.07 | c | 1.19 | c | −1.70 | a | −2.09 | ab | 19.57 | ns | 0.13 | a | 0.11 | ns |
| 4 | 5942 | b | −0.31 | b | 1.33 | c | 1.23 | c | −2.90 | b | −2.25 | ab | 15.26 | ns | 0.10 | ab | 0.09 | ns |
| 10 | 9593 | a | −0.55 | c | 2.46 | b | 2.46 | b | −2.66 | b | −2.83 | b | 13.93 | ns | 0.09 | b | 0.09 | ns |
| 14 | 851 | c | −0.20 | a | 3.91 | a | 3.17 | a | −2.03 | a | −1.75 | a | 14.45 | ns | 0.11 | a | 0.09 | ns |
Values reported in columns represent for each factor the mean of different treatments. Means within each factor followed by different letters are significantly different (P < 0.05) according to Tukey's test.