Role of Energy in Pathogenic Variability of Pyricularia oryzae

Pyricularia oryzae Cav. reacts differently to different varieties. IB race group attacked Zenith for three consecutive years for both rabi and kharif seasons under artificial inoculation condition. Three different isolates were obtained in IB race which differed in their pathogenicity giving a constant susceptible reaction to Zenith. The difference in energy potential of three isolates of P. oryzae was tested biochemically. Total sugar, protein and protein patterns were studied following modern methods. W isolate contained maximum amount of total sugar (18.3 μg/g), total protein (23.8 μg/g albumin equivalent) and seven distinct protein bands on polyacrylamide disc electrophoretic gel which was directly correlated with maximum infection value. So it was concluded that the aggressiveness of P. oryzae depends on its energy potentiality in terms of total protein and protein patterns.