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Open Access Highly Accessed Research article

Antimicrobial activities of endophytic fungi isolated from Ophiopogon japonicus (Liliaceae)

Hanqiao Liang, Yongmei Xing, Juan Chen, Dawei Zhang, Shunxing Guo* and Chunlan Wang*

Author Affiliations

The Key Laboratory of Bioactive Substances and Resource Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100193, Peoples Republic of China

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BMC Complementary and Alternative Medicine 2012, 12:238  doi:10.1186/1472-6882-12-238

Published: 28 November 2012

Abstract

Background

Drug resistance in bacteria has become a global concern and the search for new antibacterial agents is urgent and ongoing. Endophytes provide an abundant reservoir of bioactive metabolites for medicinal exploitation, and an increasing number of novel compounds are being isolated from endophytic fungi. Ophiopogon japonicus, containing compounds with antibacterial activity, is a traditional Chinese medicinal plant used for eliminating phlegm, relieving coughs, latent heat in the lungs, and alleviating diabetes mellitus. We investigated the antimicrobial activities of 30 strains of O. japonicus.

Methods

Fungal endophytes were isolated from roots and stems of O. japonicus collected from Chongqing City, southwestern China. Mycelial extracts (MC) and fermentation broth (FB) were tested for antimicrobial activity using peptide deformylase (PDF) inhibition fluorescence assays and MTT cell proliferation assays.

Results

A total of 30 endophytic strains were isolated from O. japonicus; 22 from roots and eight from stems. 53.33% of the mycelial extracts (MC) and 33.33% of the fermentation broths (FB) displayed potent inhibition of PDF. 80% of MC and 33.33% of FB significantly inhibited Staphylococcus aureus. 70% of MC and 36.67% of FB showed strong activities against Cryptococcus neoformans. None showed influence on Escherichia coli.

Conclusion

The secondary metabolites of endophytic fungi from O. japonicus are potential antimicrobial agents.

Keywords:
Ophiopogon japonicus; Endophytic fungi; Peptide deformylase; Antimicrobial activity