Isolation, purification and characterization of an antifungal molecule produced by Bacillus licheniformis BC98, and its effect on phytopathogen Magnaporthe grisea

Tendulkar, SR and Saikumari, YK and Patel, V and Raghotama, S and Munshi, TK and Balaram, P and Chattoo, BB (2007) Isolation, purification and characterization of an antifungal molecule produced by Bacillus licheniformis BC98, and its effect on phytopathogen Magnaporthe grisea. In: Journal of Applied Microbiology, 103 (6). pp. 2331-2339.

PDF jam_103_2007.pdf - Published Version Restricted to Registered users only Download (336kB) | Request a copy

Abstract

Aims: Isolation of bacterial antagonist for use in the biological control of phytopathogenic fungi like rice blast fungus, Magnaporthe grisea, and to further purify and characterize the antifungal molecule produced by the antagonist. Methods and Results: Bacterial antagonist exhibiting highest antifungal activity against the rice blast fungus M. grisea was isolated from soil and identified as Bacillus licheniformis BC98. Besides M. grisea, the isolate also inhibited the growth of other phytopathogens such as Curvularia lunata and Rhizoctonia bataticola. Biologically active fractions were isolated from the culture filtrate and further fractionated by reverse-phase high-performance liquid chromatography (HPLC) enabling detailed structural characterization of a component of molecular mass 1035 Da. The active peptide was identified as surfactin after 500 MHz $^1H$ NMR analysis. Microscopic analysis of the effect of the antagonist on M. grisea revealed bulbous hyphae showing patchy and vacuolated cytoplasm when observed under the electron microscope. Conclusions: The antagonistic lipopeptide secreted by B. licheniformis BC98 and identified as surfactin, induced morphological changes in M. grisea, inhibiting its further growth, and thus exhibiting fungicidal activity. Significance and Impact of the Study: The antagonist inhibits germination of M. grisea, a potent rice phytopathogen, and therefore appears to be a potential candidate for control of rice blast disease.

Item Type:	Journal Article
Publication:	Journal of Applied Microbiology
Publisher:	John Wiley & Sons.
Additional Information:	Copyright of this article belongs to John Wiley and Sons.
Keywords:	Antagonist;Bacillus licheniformis BC98;lipopeptide;Magnaporthe grisea;surfactin.
Department/Centre:	Division of Biological Sciences > Molecular Biophysics Unit Division of Chemical Sciences > Sophisticated Instruments Facility (Continued as NMR Research Centre)
Date Deposited:	16 Sep 2008 10:05
Last Modified:	30 Jan 2014 12:24
URI:	http://eprints.iisc.ac.in/id/eprint/15747

Actions (login required)

View Item