This study from Drexel University (2015), investigated how bacterial root communities on two large installed plant biowalls changed over time in response to exposure to volatile organic compounds (VOCs).

Using 16S rRNA amplicon sequencing, root bacterial communities from soil-grown plants were compared to those from both biowalls. Further in laboratory comparison was also made with plant roots exposed to either clean or VOC-laden air.

The results indicate large bacterial community differences, between:

• Soil-grown and biowall-grown plants
• Plant roots exposed to clean air and those exposed to VOCs

It was also noted, that highly enriched levels of bacteria Hyphomicrobium were present in all VOC exposed roots.

The researchers conclude that these bacteria, known for their capacity to break down both halogenated and aromatic compounds, are also important VOC degraders. They suggest that encouraging colonization to mitigate the impacts of indoor air pollution, should be considered.