Investigating physiological and biochemical

3.2.3.6 Effect of salt stress on Na
+
 contents in roots
Increasing salinity increases the concentration of Na
+
in root zone as well as in the 
plant body. Hence maximum Na
+
contents (12.63 %) were recorded at 200 mM NaCl 
while minimum Na
+
contents were noted in control treatment (Table 3.2.4). 
Significant differences among genotypes were recorded in terms of Na
+
accumulation 
in roots and relatively higher Na
+
accumulation was noted in salt tolerant genotypes. 
At control (Hoagland’s salinity), where no additional salts were added, accumulation 
of Na
+
in roots was not much variable among linseed genotypes but with the 
application of salinity, Na
+
accumulation in roots of all the genotypes increased and 
changed sharply. For instance, at 100 mM NaCl, accumulation of Na
+
in the roots of 
salt tolerant genotypes increased from 1.38% to 5.75% in NO-303 and from 1.36% to 
7.06% in 637-72. Similarly, at 200 mM NaCl, Na
+
accumulation was almost double 
than that at 100 mM NaCl in the roots of all linseed genotypes. The maximum Na
+
accumulation was noted in the roots of 637-72 (12.63%) followed by NO-303 
(10.31%) while relatively less Na
+
was bound to the roots of salt sensitive genotypes 
S-907 (7.99%) and C-99-3-115 (10.11%) at

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78 
 
 
 
Table 3.2.3. Root fresh and dry weight of linseed genotypes at different salinity levels 
 
Genotypes 
RFW (g plant
-1
) 
RDW (g plant
-1
) 
Control 
NaCl
(100 mM) 
NaCl
(200 mM)