Biochemical changes associated with induction of resistance in rice seedlings to Helminthosporium oryzae by seed treatment with chemicals
1987
Hait, G.N. (Kalyani Univ. (India). Dept. of Plant Pathology) | Sinha, A.K.
Wet treatment of rice grains of the susceptible cultivar 'Dharial' by soaking for 24 h in solutions of sodium selenite (10(-5) mol/l) and cysteine (10(-3) mol/l) provided substantial protection to the seedlings against Helminthosporium oryzae up to 4 weeks. With sodium selenite treatment, however, the induced protective effect persisted at a significant level up to 6 weeks. As a consequence of seed treatment, susceptible plants recorded reduced protein content and increased peroxidase activity, and such changes between the age of 2 and 4 weeks brought them closer to the conditions prevailing in resistant plants in these respects. Treated susceptible plants mostly responded to inoculation with H. oryzae with greater than usual increases within phenol and protein levels and also in polyphenol oxidase and peroxidase activities. T0696heir responses in these respects, generally, showed similar trends as and were often quite close to those in resistant plants. With sodium selenite treatment which provided rice plants protection over a longer period than cysteine, many of the induced responses were more pronounced and persisted lo
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