Abstract
Spray treatment of rice seedlings with three heavy metal salts and four amino acids 2 days before inoculation withHelminthosporium oryzae reduced brown spot symptoms by 23 to 52 % and 36 to 82 % respectively. Among the heavy metal salts tested, silver nitrate appeared to induce stronger effect than others. In most cases the lower concentration yielded better results. The situation was just the reverse for the amino acids. Among them DL-methionine gave maximum protection being closely followed by DL-norleucine. Different treatments affected both the components of brown spot symptoms, i.e. the number of lesions and lesion size. Resistance induced in rice seedlings appeared to function through (i) a reduction in the number of infection and (ii) an inhibition to lesion expansion. Those compounds which showed better effects in these respects gave better protection to the seedlings.
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Trivedi, N., Sinha, A.K. Effect of pre-inoculation treatments with some heavy metal salts and amino acids on brown spot disease in rice seedlings. Proc. Indian Acad. Sci. 89, 283–289 (1980). https://doi.org/10.1007/BF03046166
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DOI: https://doi.org/10.1007/BF03046166