Changes of catalase activity in sugarcane due to early and post infection of Pratylenchus zeae

In both roots and leaves of sugarcane clones, response to htylenchus zeae infection was compared in resistant (Co 7717) and susceptible (CoC 671) clones at 3, 7, 14, 21, 28 and 35 days after infection. In resistant clone, maximum per cent decrease in catalase activity over uninfected was at 21 and 14 days after infection in roots and leaves respectively. In susceptible clone, the maximum per cent increase of catalase activity over uninfected was at 7 days in roots and 35 days in leaves. Among the 8 resistant clones, all clones showed decreased catalase activity over uninfected clones except in two clones (CoT8201 and NCo 310). In susceptible clones, all clones showed an increase over uninfected clones while the remaining two clones (Co 7219 and Co 62175) showed decreased enzyme activity.