Role of amino acids and amides in helminthosporiose disease incidence in finger-millet

Vidhyasekaran, P. (1977) Role of amino acids and amides in helminthosporiose disease incidence in finger-millet. Indian Phytopathology, 30 (1). pp. 41-46.

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Abstract

The lower susceptible leaves of the Eleusine coracana variety Co4, with a high degree of susceptibility to H. nodulosum (Cochliobolus nodulosus), contained significantly greater amounts of asparagine, methionine and cysteine than those of the resistant upper leaves of Co4 or the leaves of the resistant variety K1. Experiments revealed that (1) N fertilizer, in the form of ammonium nitrate, increased these and other aminoacids in Co4, (2) asparagine and aspartic and glutamic acids, but not methionine or cysteine, induced fungal growth in culture and the production of pectin methylesterase, endopoly-galacturonase, exopolygalacturonase, polygalacturonate transeliminase, and macerating and cellulolytic enzymes by the fungus, and (3) methionine and cysteine reversed the inhibitory action of catechol on the pectic and cellulolytic enzymes produced by the fungus. The possible interrelationships of these various biochemicals and their effects on susceptibility are briefly considered.ADDITIONAL ABSTRACT: Leaves of Eleusine coracana susceptible to Helminthosporium nodulosum [Cochliobolus nodulosus] contained more asparagine, methionine and cysteine than resistant leaves. Application of nitrogenous fertilizers increased the concs. of these compounds and also disease incidence. Asparagine increased growth of the pathogen in vitro but methionine and cysteine were inhibitory. Methionine and cysteine reversed the inhibitory activity of quinones on pectic and cellulolytic enzymes produced by C. nodulosus

Item Type: Article
Author Affiliation: Department of Plant Pathology, Tamil Nadu Agric. Univ., Coimbatore, India.
Subjects: Plant Protection
Divisions: Millet
Depositing User: Mr B Krishnamurthy
Date Deposited: 04 Jul 2012 14:57
Last Modified: 04 Jul 2012 14:57
URI: http://eprints.icrisat.ac.in/id/eprint/6529

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