Table 2. Root, shoot and leaf Na+ and K+ concentrations and Na+/K+ ratio of three barley genotypes during anthesis stage, exposure to alone and combined stresses of drought (4% soil moisture) and salinity.
| Treatment | Na+ concentration (mg g-1 DW) |
K+ concentration (mg g-1 DW) |
Na+/K+ Ratio |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Root | Leaf | Stem | Root | Leaf | Stem | Root | Leaf | Stem | |
| CM72 | |||||||||
| Control | 0.48 c | 10.81 c | 8.61 b | 1.07 a | 9.73 b | 9.49 b | 0.44 d | 1.12 b | 0.92 c |
| Drought | 0.63 b | 13.97 b | 8.38 b | 1.06 a | 12.24 a | 10.82 a | 0.59 c | 1.14 b | 0.77 d |
| (+31.3) | (+29.2) | (-2.6) | (-0.9) | (+25.8) | (+14.0) | (+34.1) | (+1.7) | (-16.3) | |
| Salinity | 0.59 bc | 22.75 a | 18.31a | 0.87 b | 8.61 c | 9.30 b | 0.69 b | 2.67 a | 1.97 b |
| (+22.9) | (+110.4) | (+112.6) | (-18.7) | (+11.5) | (-2.0) | (+56.8) | (+138.4) | (+114.1) | |
| D+S | 1.64 a | 21.09 a | 20.52 a | 0.94 b | 9.19 c | 5.42 c | 1.74 a | 2.31 a | 3.76 a |
| (+241.6) | (+95.1) | (+138.3) | (-12.1) | (-5.5) | (-42.9) | (+295.5) | (+106.3) | (+308.9) | |
| XZ16 | |||||||||
| Control | 0.28 c | 14.90 b | 10.45 b | 0.90 c | 9.99 b | 8.34 b | 0.31 c | 1.50 bc | 1.26 c |
| Drought | 0.90 b | 16.27 b | 9.63 b | 1.15 a | 12.61 a | 10.95 a | 0.78 b | 1.29 c | 0.88 d |
| (+221.4) | (+9.2) | (-7.8) | (+27.8) | (+26.2) | (+31.3) | (+151.6) | (-14.0) | (-30.2) | |
| Salinity | 0.86 b | 20.65 a | 20.30 a | 1.09 b | 10.54 b | 8.74 b | 0.79 b | 1.98 a | 2.33 b |
| (+207.1) | (+38.6) | (+94.3) | (+21.1) | (+5.5) | (+4.8) | (-154.8) | (+32.0) | (+84.9) | |
| D+S | 1.54 a | 20.12 a | 22.42 a | 1.08 b | 11.85 a | 8.04 b | 1.45 a | 1.71 b | 2.83 a |
| (+450.0) | (+35.0) | (+114.5) | (+20.0) | (+18.6) | (-3.6) | (+367.7) | (+14.0) | (+124.6) | |
| XZ5 | |||||||||
| Control | 0.56 c | 18.15 b | 9.76 b | 1.25 b | 9.66 c | 8.16 b | 0.45 d | 1.90 bc | 1.20 b |
| Drought | 1.27 a | 13.80 c | 10.28 b | 1.71 a | 11.75 b | 11.51 a | 0.74 c | 1.18 c | 0.90 c |
| (+126.7) | (-23.1) | (+5.3) | (+36.8) | (+21.6) | (+41.1) | (+64.4) | (-37.9) | (-25.0) | |
| Salinity | 0.98 b | 26.51 a | 22.12 a | 1.01 c | 11.71 b | 7.20 b | 0.98 b | 2.27 a | 3.07 a |
| (+75.0) | (+46.1) | (+126.63) | (-19.2) | (+21.22) | (-11.8) | (+117.7) | (+19.47) | (+155.8) | |
| D+S | 1.18 ab | 23.69 a | 23.57 a | 0.95 c | 13.40 a | 7.48 b | 1.30 a | 1.78 b | 3.16 a |
| (+110.7) | (+30.5) | (+141.5) | (-24.0) | (+38.7) | (-8.3) | (+188.9) | (-6.31) | (+163.3) | |
Different letters indicate significant differences (P<0.05) among three genotypes within each treatment (n=4). Values in parenthesis are expressed as a decreased (-)/increased (+) percentage of the control.