Volatile Organic Compound Chamber: A Novel Technology for Microbiological Volatile Interaction Assays

Area of Science:

• Microbiology
• Biochemistry
• Plant Pathology

Background:

• Microbial interactions mediated by volatile organic compounds (VOCs) are gaining research interest.
• Current experimental methods often use non-specific materials, limiting sensitivity and selectivity.
• Understanding VOC-mediated interactions is crucial for biocontrol and identifying novel bioactive compounds.

Purpose of the Study:

• To introduce and validate a novel volatile organic compound chamber (VOC chamber) for studying microbial interactions.
• To compare the performance of VOC chambers against traditional methods in terms of sensitivity, selectivity, and homogeneity.
• To investigate the role of ventilation in VOC-mediated microbial interactions.

Main Methods:

• Development and testing of a specifically designed VOC chamber.
• Experimental assays using four *Trichoderma* strains against *Fusarium oxysporum* and *Rhizoctonia solani*.
• Comparison of results from VOC chambers under vented and non-vented conditions with traditional methods.

Main Results:

• VOC chambers demonstrated higher sensitivity, selectivity, and homogeneity compared to traditional methods.
• Ventilation significantly altered the effects of VOCs, with some inhibitory effects becoming promoting.
• *Trichoderma harzianum*'s promoting activity in vented conditions was linked to squalene accumulation.

Conclusions:

• VOC chambers provide an easy, homogeneous, flexible, and repeatable method for studying VOC-mediated microbial interactions.
• The developed chambers facilitate the selection of microorganisms with high biocontrol potential.
• This method aids in identifying new bioactive VOCs and elucidating their roles in microbial ecology.