Investigating physiological and biochemical

Control 
NaCl
(100 mM) 
NaCl
(200 mM) 
S-907 
9.77±0.17 
4.18±0.13 (43) 
3.07±0.35 (31) 
0.83±0.19 
0.29±0.09 (35) 
0.19±0.08 (23) 
C-99-3-115 
9.03±0.10 
4.60±0.29 (51) 
4.03±0.15 (45) 
0.67±0.13 
0.32±0.11 (48) 
0.23±0.12 (35) 
637-72 
9.59±0.20 
7.42±0.10 (77) 
5.54±0.20 (58) 
0.74±0.15 
0.50±0.13 (67) 
0.37±0.10 (51) 
NO-303 
10.51±0.25 
10.03±0.26 (95) 
9.39±0.21 (89) 
1.28±0.10 
1.06±0.15 (83) 
0.71±0.13 (55) 
Each value is an average of 3 replications ± SE and values in parenthesis are the percent of their respective control
 

---

79 
200 mM NaCl (Table 3.2.4). There exists 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 salt stress while salt tolerant genotypes bound more Na
+
in their 
roots as compared to salt sensitive genotypes.
 
3.2.3.7 Effect of salt stress on K
+
 contents in roots
Concentration of K
+
was highly affected by the application of NaCl in the roots of 
linseed and K
+
concentration was significantly decreased between control and 200 
mM NaCl and the maximum K
+
concentration was recorded at control while 
minimum K
+
concentration was noted at 200 mM NaCl (Table 3.2.4). Genotypes also 
showed significant variation for K
+
accumulation in roots and the maximum K
+
contents were recorded in NO-303 while minimum K
+
contents were noted in S-907 
genotype at all the levels of treatments. In control, the maximum K
+
contents were 
accumulated by the roots of salt tolerant NO-303 genotype (3.16%) while the 
minimum K
+
accumulation was noted in salt sensitive genotype S-907 (2.86%). With 
increasing NaCl treatments, increasing competition between different ions decreased 
the K
+
contents in the roots of all genotypes. The greatest reduction in K
+
contents 
occurred at the highest salt concentrations of 200 mM NaCl. At 100 mM NaCl, K
+
contents decreased from 2.86% to 1.30% in S-907 and from 3.16% to 2.26% in 
NO-303. Similarly, at 200 mM NaCl, K
+
contents of salt tolerant genotypes NO-303 
(2.46%) and 637-72 (1.19%) were the maximum as compared to salt sensitive 
genotypes C-99-3-115 (0.55%) and S-907 (0.45%) (Table 3.2.4). There was 
significant difference between salt tolerant (NO-303 and 637-72) genotypes and salt 
sensitive genotypes (C-99-3-115 and S-907) for their root K
+
concentration but 
overall, salt tolerant genotypes NO-303 accumulated greater concentration of K
+
ions 
in roots. Salt sensitive genotype C-99-3-115 accumulated higher K
+
contents in roots 
than S-907 while similar trend was observed in salt tolerant genotype NO-303 at 
increasing levels of NaCl. 

---

80 
 
Table 3.2. 4. Effect of different levels of NaCl (mM) on Na
+
and K
+
contents in roots of salt sensitive (S-907 and C-99-3-115)
And salt tolerant (637-72 and NO-303) genotypes of linseed.