Table 1.
Disease rating scale used for screening of onion germplasm against purple blotch.
Fig 1.
(a) The purified culture of Alternaria porri, isolated from the diseased leaves of onion showing typical symptoms of purple blotch (b) the microscopic picture of spores of A. porri.
Fig 2.
Diseased onion samples showing typical symptoms of purple blotch disease.
Table 2.
Average disease severity index after seven-day interval of post inoculation.
Table 3.
Nested Structured ANOVA for determination of Superoxide Dismutase (U/mg protein) from inoculated and un-inoculated leaves of onion plants.
Table 4.
Quantity of Superoxide Dismutase (U/mg protein) in type (inoculated and un-inoculated), reaction groups (susceptible and resistant) and varieties/advanced lines of onion plants.
Fig 3.
SOD concentration in inoculated and un-inoculated, resistant and susceptible varieties/advanced lines of onion.
Table 5.
Nested Structured ANOVA for determination of Peroxide (U/mg protein) from inoculated and un-inoculated leaves of onion plants.
Table 6.
Quantity of Peroxidase (U/mg protein) in type (inoculated and un-inoculated), reaction groups (susceptible and resistant) and varieties/advanced lines of onion plants.
Fig 4.
POD concentration in inoculated and un-inoculated, resistant and susceptible varieties/advanced lines of onion.
Table 7.
Nested Structured ANOVA for determination of Catalase (U/mg protein) from inoculated and un-inoculated leaves of onion plants.
Fig 5.
CAT concentration in inoculated and un-inoculated, resistant and susceptible varieties/advanced lines of onion.
Table 8.
Quantity of Catalase (U/mg protein) in type (inoculated and un-inoculated), reaction groups (susceptible and resistant) and varieties/advanced lines of onion plants.
Fig 6.
Mean disease incidence of purple blotch of onion after application of plant activators under greenhouse conditions. The bars having similar letters are not significantly different according to LSD (P ≤ 0.05).
Fig 7.
Impact of interaction between plant activators and their concentrations, showing mean disease incidence of purple blotch of onion with respect to change in concentrations. The bars having similar letters are not significantly different according to LSD (P ≤ 0.05).
Fig 8.
Impact of interaction between plant activators and weeks, showing mean disease incidence of purple blotch of onion with respect to time intervals. The bars having similar letters are not significantly different according to LSD (P ≤ 0.05).
Fig 9.
Mean disease incidence of purple blotch of onion after application of plant activators under field conditions. The bars having similar letters are not significantly different according to LSD (P ≤ 0.05).
Fig 10.
Impact of interaction between plant activators and weeks, showing mean disease incidence of purple blotch of onion with respect to time intervals under field conditions. The bars having similar letters are not significantly different according to LSD (P ≤ 0.05).