FUNGITOXIC POTENTIAL OF TAGETES ERECTUS FOR THE MANAGEMENT OF ALTERNARIA ALTERNATA STRAINS OF TOMATO

摘要

Tomato (Lycopersicum esculentum Mill.) is economically the most vital vegetable crops of this world but diseasesreduce tomato production to a greater extent worldwide. Plants exudates contribute a lot in fight against pathogens. Thecurrent study indicates the pathogenic potential of Alternaria alternata FCBP-573 against tomato. RAPD analysis confirmedthat A. alternata FCBP-573 had variability in its genetic constitution with other two isolates; this disparity in geneticconstitution might be a cause to stir up more pathogenicity in this isolate. Therefore, it was selected as the most pathogenicisolate and subjected to biological control through Tagetes erectus L. In antifungal bioassays different plant parts of T.erectus with 1-4% concentrations of aqueous, and organic extracts of each part were evaluated against A. alternata FCBP573.Results revealed that the growth of A. alternata FCBP-573 was greatly inhibited at 4% concentration of methanolextract followed by aqueous and n-hexane extract. Among different plant parts tested, root extract exhibited more promisingresults by causing 81-92% reduction in biomass. The research concludes that aqueous and organic extracts of ornamentalshave potential to obstruct dreadful effect of pathogenic fungi by suppressing their growth. T. erectus conferred vital andsurprisingly stable compounds having inhibitory potential against A. alternata FCBP-573.