Volatile antimicrobials from Muscodor albus, a novel endophytic fungus

Area of Science:

• Microbiology
• Mycology
• Natural Products Chemistry

Background:

• Muscodor albus is an endophytic fungus discovered in cinnamon trees.
• This fungus emits volatile compounds with antimicrobial properties.

Purpose of the Study:

• To investigate the antimicrobial activity of volatile compounds produced by Muscodor albus.
• To identify the classes of compounds responsible for the observed inhibition and lethality.
• To explore the ecological and practical implications of Muscodor albus's 'mycofumigation' effects.

Main Methods:

• Gas chromatography/mass spectrometry was used to identify volatile compounds.
• An artificial mixture of identified compounds was created to mimic the fungus's effects.
• The inhibitory and lethal effects of individual compound classes and the mixture were tested against various fungi and bacteria.

Main Results:

• Five classes of volatile compounds were identified: alcohols, esters, ketones, acids, and lipids.
• Each compound class exhibited some inhibitory effect, but none were lethal individually.
• The collective action of these compounds demonstrated synergistic lethality against a broad spectrum of plant- and human-pathogenic fungi and bacteria.
• Esters, specifically 1-butanol, 3-methyl-, acetate, were the most effective inhibitory compounds.

Conclusions:

• Muscodor albus produces a synergistic mixture of volatile compounds with potent antimicrobial activity.
• The identified volatile compounds and their synergistic action offer potential for novel biocontrol strategies.
• Further research into the ecological roles and practical applications of Muscodor albus is warranted.