Investigating physiological and biochemical

3.3.3.8 Superoxide dismutase (SOD) and catalase (CAT) enzymes
The activity of SOD and CAT enzymes in salt sensitive and tolerant genotypes 
are presented in Table 3.3.8. The results of this study showed that activity of SOD 
increased while that of CAT decreased to a significant level under salt stress 
conditions in all the genotypes of linseed and the maximum SOD (371.67 unit mg
-1
protein) and the minimum CAT activity (5.17 unit mg
-1
protein) was recorded at 200 
mM NaCl. Significant change was observed among genotypes for their SOD and CAT 
activities by the application salt treatments. Salt tolerant genotypes had well efficient 
SOD system and its activity increased from 198.0 to 303.3 unit mg
-1
protein in 637-72 
genotype followed by NO-303 (204.0 to 283.3 unit mg
-1
protein) while in salt 
sensitive genotype C-99-3-115, the concentration ranged from 186.85 to 222.00 unit 
mg
-1
protein for SOD at 100 mM NaCl. On the other hand, salt tolerant genotype 
NO-303 showed higher reduction in CAT activity (5.62 unit mg
-1
protein) than that of 
637-72 (4.80 unit mg
-1
protein) at 100 mM NaCl. Similarly, salt sensitive genotype 
C-99-3-115 expressed high activity CAT (6.06 unit mg
-1
protein) as compared to 
S-907 (5.76 unit mg
-1
protein) at NaCl level of 100 mM. At 200 mM NaCl, SOD 
activity of NO-303 (371.67 unit mg
-1
protein) and 637-72 (343.33 unit mg
-1
protein) 

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114 
Table 3.3.8. Effect of salinity on superoxide dismutase (SOD) and catalase (CAT) enzyme concentration of linseed genotypes 
 
Genotypes 
SOD (Unit mg
-1
 protein) 
CAT (Unit mg
-1
 protein)