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. 2013 Oct 24;8(10):e77869. doi: 10.1371/journal.pone.0077869

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.