Investigating physiological and biochemical

C-99-3-115 
0.18± 0.03
3.42±0.03
4.51±0.02 
1.81±0.05
0.68 ±0.02
0.21 ±0.03
637-72 
0.22± 0.09
3.37±0.04
4.51±0.01
1.87±0.02 
1.67±0.04
1.89 ±0.06
NO-303 
0.14± 0.06 
3.44±0.05
3.34±0.02
1.88±0.03 
1.68± 0.01
2.00 ±0.03
Each value is an average of 3 replications ± SE. 

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86 
However, at 200 mM NaCl, different trend in leaf K
+
contents was recorded and salt 
K
+
contents increased in the leaves of salt tolerant genotype and found the maximum 
in NO-303 (2.0%) followed by 637-72 (1.89%) while the leaf K
+
contents of salt 
sensitive genotypes C-99-3-115 (0.21%) and S-907 (0.40%) were the minimum 
(Table 3.2.6). There was significant difference between salt tolerant (NO-303 and 
637-72) and salt sensitive genotypes (C-99-3-115 and S-907) at increasing levels of 
salinity i.e. 100 mM NaCl and 200 mM NaCl.
3.2.3.12 Effect of salt stress on K
+
/Na
+
 ratio in roots
K
+
/Na
+
ratio is considered one of the most important selection criteria of salt 
tolerance in crop plants. Thus determination of K
+
/Na
+ 
ratio in different plant parts 
was of utmost necessity. K
+
/Na
+
was highly affected in the roots of linseed by the 
application of salinity (NaCl) as K
+
/Na
+
ratio was significantly decreased between 
control and 200 mM NaCl. The maximum K
+
/Na
+ 
ratio was recorded at control while 
the minimum K
+
/Na
+
ratio was measured at 200 mM NaCl (Table 3.2.7). There was 
significant difference between genotypes regarding their root K
+
/Na
+
ratio and the 
maximum K
+
/Na
+
ratio was noted in salt tolerant genotypes while the minimum 
K
+
/Na
+
ratio was noted in salt sensitive genotypes. At 100 mM NaCl, the root K
+
/Na
+
ratio reduced from 1.98 to 0.26 in S-907 genotype and from 2.32 to 0.29 in 637-72 
genotype. Similarly, at 200 mM NaCl, K
+
/Na
+ 
ratio of salt tolerant genotypes 637-72 
(0.10) and NO-303 (0.24) remained higher than that of salt sensitive genotypes 
C-99-3-115 (0.05) and S-907 (0.06). Linseed genotypes exhibited variation in their 
root K
+
/Na
+
ratio at all the treatments and genotype 637-72 showed more reduction in 
root K
+
/Na
+
ratio as compared to NO-303 at 100 mM NaCl, however, salt sensitive 
genotype C-99-3-115 showed almost equal root K
+
/Na
+
ratio to salt tolerant genotype 
637-72 at low salinity levels.