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Enhancement of anti-candidal activity of endophytic fungus Phomopsis sp. ED2, isolated from Orthosiphon stamineus Benth, by incorporation of host plant extract in culture medium

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Abstract

This study examined the effect of host extract in the culture medium on anti-candidal activity of Phomopsis sp. ED2, previously isolated from the medicinal herb Orthosiphon stamineus Benth. Interestingly, upon addition of aqueous host extract to the culture medium, the ethyl acetate extract prepared from fermentative broth exhibited moderate anti-candidal activity in a disc diffusion assay. The minimal inhibitory concentration of this extract was 62.5 μg/ml and it only exhibited fungistatic activity against C. albicans. In the time-kill study, a 50% growth reduction of C. albicans was observed at 31.4 h for extract from the culture incorporating host extract. In the bioautography assay, only one single spot (Rf 0.59) developed from the extract exhibited anti-candidal activity. A spot with the a similar Rf was not detected for the crude extract from YES broth without host extract. This indicated that the terpenoid anti-candidal compound was only produced when the host extract was introduced into the medium. The study concluded that the incorporation of aqueous extract of the host plant into the culture medium significantly enhanced the anti-candidal activity of Phomopsis sp. ED2.

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Authors and Affiliations

  1. Industrial Biotechnology Research Laboratory, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia

    Tong Woei Yenn, Chong Chai Lee & Darah Ibrahim

  2. Plant Pathology Research Laboratory, School of Biological Sciences, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia

    Latiffah Zakaria

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  1. Tong Woei Yenn
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  2. Chong Chai Lee
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  4. Latiffah Zakaria
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Correspondence to Tong Woei Yenn.

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Yenn, T.W., Lee, C.C., Ibrahim, D. et al. Enhancement of anti-candidal activity of endophytic fungus Phomopsis sp. ED2, isolated from Orthosiphon stamineus Benth, by incorporation of host plant extract in culture medium. J Microbiol. 50, 581–585 (2012). https://doi.org/10.1007/s12275-012-2083-8

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  • DOI: https://doi.org/10.1007/s12275-012-2083-8

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