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Bio-efficacy of selected medicinal plants against phytopathogens of cereal crops and phytochemical examination of Prosopis juliflora (sw)dc.

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Author(s): B. Seetha Lakshmi1*, K. C. Naidu2, Y.L.N.Murthy3, Varaprasad Bobbarala2, N.Pandit3.

Journal: Journal of Pharmacy Research
ISSN 0974-6943

Volume: 3;
Issue: 2;
Start page: 356;
Date: 2010;
Original page

Keywords: Antimicrobial activity | Prosopis juliflora | phytopathogen strains | alkaloids.

ABSTRACT
Thirty four plant species were screened for antimicrobial activity against phytopathogens using agar well diffusion method. Prosopis juliflora leaf extract produced significant zones of inhibition against all the pathogens tested at a concentration of 10mg/ml. Apart from preliminary screening results P. juliflora chosen for phytochemical analysis. The ethyl acetate fraction of methanol extract was used for the isolation of the biopesticidal compounds. The presence of â-sitosterol in this species is reported for the first time and the other compounds prosopidione a terpenoid diketone, and three alkaloids namely secojuliprosopinal, 3’oxojuliprosopine, and juliprosopine were also identified by the spectral data. Secojuliprosopinal has a broad spectrum of antimicrobial activity. This activity is reported for the first time on these compounds. The remaining two alkaloids are moderately active against pathogens tested. The study results reveal that antimicrobial activity of methanolic extract is the synergetic effect of the alkaloids in the leaves, which are water soluble. Hence this plant can be used as a lead bio-pesticide in combating the diseases caused by these pathogens on cereal crops and might be the best for the control of soil mycoflora, which were causing seedling rot disease in cereal crops.

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