Keywords:
Bakanae, Defence, Foot rot, Peroxidase, Phenol, Resistance
Bakanae (foolish seedling) is an economically destructive seed borne fungal disease of rice prevalent all across the world. The current investigation was undertaken to decipher the effect of Fusarium fujikuroi inoculation on rice seeds by evaluating the post infection physio-biochemical changes in the basmati and non-basmati rice cultivars. Seeds of two basmati and two non-basmati rice cultivars were inoculated with the virulent isolate of F. fujikuroi, from which enzymatic antioxidants and metabolites present in seeds were quantified 48 h post inoculation. Germination studies were conducted in healthy and inoculated seeds to compare their vigour. Reduction in per cent germination, increase in root and shoot length, fresh and dry weight of seedlings in the tested cultivars post inoculation with the pathogen was observed. However, the variation in vigour traits was significant in basmati cultivars only. Total phenols and ortho-dihydroxy phenols reduced post inoculation in basmati cultivars and the reverse was seen in non- basmati cultivars. The PPO and PAL activity increased post inoculation in seeds of non-basmati rice cultivars. The present study revealed that the inherent phenolic metabolism of non-basmati rice cultivars offers resistance to disease infestation. Following responses of basmati and non-basmati rice cultivars against F. fujikuroi, it may be inferred that enzymatic activity of POD, SOD, PPO and PAL play a significant role in resistance signalling against this disease and the change in their activity could be an ideal trait for predicting resistance against bakanae.
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