Analysis : Like Cat And Apx, Pod ( Guaiacol Peroxidase ) Activity
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Like CAT and APX, POD (Guaiacol peroxidase) activity was higher in mycorrhizal than in non-mycorrhizal plants under deficient phosphorus condition. A marked increase in guaiacol peroxidase activity in roots and leaves was associated with increased phosphorus concentrations, POD activity in mycorrhizal Zea mays leaves was significantly decreased by about 1.1_ and 1.4_ fold at 15 and 30 mg P kg-1 soil, respectively as compared to the control. The same trend was observed for mycorrhizal Zea mays roots in which the corresponding values were 1.2_ and 1.7_fold respectively.
As the phosphorus concentrations increased in the culture medium to 60 mg P kg-1 soil the activity of POD significantly decreased in both roots and leaves of mycorrhizal Zea mays being 2.7_ and 2.5_fold respectively, compared to the control value (-P).
At the highest phosphorus concentrations used, POD activities in roots and leaves were 5.4_ and 5.3_fold compared to the control value (-P). This result means that the activity of POD in Zea mays leaves and root remains constant at phosphorus concentrations beyond 60 mg P kg-1 soil(Fig 8D).
TABLE 8D: Effect of five phosphorus levels (0, 15, 30, 60, and 120 mg P kg-1 soil) on activity of guaiacol peroxidase (POD) µmol g-1 FW of Zea mays grown for 45 days in calcareous soils with mycorrhizal (+M) and non- mycorrhizal (-M) treatments. (Details)
Treatments Guaiacol peroxidase (POD) µmol gm-1 F.W