Abstract
ABSTRACT The endolichenic Fusarium solani (EF5), known to show induced metabolite production when exposed to red and green lights, was selected for characterization of their putative light-regulated bioactive compounds. To achieve this, fractionation was first performed for crude extracts from cultures of F. solani (EF5) incubated in green, red, white-fluorescent light and dark conditions. The extract yielded 12 (dark condition) to 15 (exposed to green, red, and white-fluorescent lights) fractions, and each of the fractions was tested for antimicrobial activities. The fraction (fraction 5) that showed the most promising antimicrobial activity was then subjected to high-performance liquid chromatography (HPLC) and liquid chromatography–mass spectrometry (LC-MS) to identify the bioactive compounds. Results revealed detection of two new metabolites from endolichenic F. solani, putatively identified as 8-deoxyjavanicin and fusolanone A, which are known to have antimicrobial properties. This study revealed that red and green lights trigger the production of 8-deoxyjavanicin and fusolanone A, which likely contributed to the antimicrobial properties demonstrated by endolichenic F. solani.
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