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Level of amino acids and post infection formation of anti fungal substances in relation to susceptibility of rice plants to helminthosporium oryzae at different levels of nitrogen supply



Level of amino acids and post infection formation of anti fungal substances in relation to susceptibility of rice plants to helminthosporium oryzae at different levels of nitrogen supply



Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 83(4): 221-228



Susceptibility of rice plants to H. oryzae increased when grown under excess or deficient soil N. The fungitoxicity and amino acid content of leaf diffusates from the rice plants were estimated after growing them in different concentrations of N. Chromatographic analysis revealed that free amino acids and amides of leaf extracts, leaf exudates and diffusates increased proportionately with the concentration of soil N. Amino acids increased more or less in leaves after 4 days of inoculation, irrespective of concentration of N used. Antifungal activity was detected in diffusates but not in the exudates of the leaves. The fungitoxicity of the diffusates decreased under both excess and dificient N manuring. The fungitoxic substances appeared to be petroleum ether soluble. There was no correlation either between host amino acids and disease susceptibility or fungitoxicity of diffusates. But apparently a correlation seemed to exist between low fungitoxicity of the diffusates and high incidence of disease. The inhibition of conidial germination and germ tube growth in the diffusates was not due to bacteria since crude leaf diffusates from amino acids and bacteria but with little or no anitfungal activity. Diffusates from control plants with a lower bacterial population showed greater antifungal activity. Leaf exudates in all cases were stimulatory for the germ tube growth of H. oryzae.

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