BIOLOGICAL ACTIVITIES OF ALTERNARIA SP. RL4 â€“ A POTENT ENDOPHYTIC FUNGUS ASSOCIATED WITH RAUVOLFIA SERPENTINA L. BENTH.

Ranjan Ghosh; Soma Barman; Pavan Kumar Jgs; Narayan C Mandal

doi:10.22159/ajpcr.2018.v11i11.27500

Authors

Ranjan Ghosh Mycology and Plant Pathology Laboratory, Department of Botany, Visva-Bharati, Santiniketan â€“ 731 235, West Bengal, India. http://orcid.org/0000-0002-7424-5102
Soma Barman Soil and Agrobio-engineering Laboratory, Department of Environmental Science, Tezpur University, Napaam, Tezpur â€“ 784 028, Assam, India. http://orcid.org/0000-0002-2132-0180
Pavan Kumar Jgs School of Bioscience and Technology, Vellore Institute of Technology, Chennai â€“ 600 127, India.
Narayan C Mandal Mycology and Plant Pathology Laboratory, Department of Botany, Visva-Bharati, Santiniketan â€“ 731 235, West Bengal, India. http://orcid.org/0000-0003-1631-0794

DOI:

https://doi.org/10.22159/ajpcr.2018.v11i11.27500

Keywords:

Rauvolfia serpentina, Endophytic fungi, Antimicrobial potential, Cidal mode of action, Antioxidant activity, Anticancerous activity

Abstract

Objectives: Endophytic fungi are considered as an important source of bioactive metabolites. The present study focused on the isolation of potent endophytic fungal strains from well-known medicinal plant Rauvolfia serpentina L. Benth. having biological activities.

Materials & Methods: Fungal endophytes were isolated from aerial parts of the plant and the potent strain was selected on the basis of antibacterial activities of cell-free supernatant (CFS). Ethyl acetate (EA) extraction of CFS was done and mode of action of EA fraction was checked against pathogenic bacteria. EA fraction was also analyzed by thin-layer chromatography (TLC). In addition, antioxidant activity was checked by 1,1-Diphenyl- 2-picrylhydrazyl-free radical scavenging assay and anticancer activity was checked against breast cancer cell line MCF-7 by MTT assay.

Results: Among the different endophytic fungal isolates, CFS of Alternaria sp. RL4 produced prominent zones of inhibition against numbers of Gram-positive pathogenic bacteria including Staphylococcus aureus (12Â±0.5 mm) and Listeria monocytogenes (17Â±2.0 mm). Massive reductions in bacterial CFS were noticed upon treatment with EA fraction (2 mg/ml). It also showed strong cidal mode of action against Gram-positive organisms. TLC analysis revealed the production of two different compounds with antibacterial potentials. In addition, EA fraction of RL4 showed very good antioxidant property with an IC50 value of 49.80Â±2.11Î¼g/ml. MTT assay also suggested the anticancerous properties of EA fraction of RL4.

Conclusion: Alternaria sp. RL4 could be a very good source of bioactive compounds for the development of new drugs.

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