Simultaneous discovery of positive and negative interactions among root microbiome bacteria using microwell recovery arrays
Niloy Barua, Ashlee M. Herken, Kyle R. Stern, Sean Reese, Roger L. Powers, Jennifer L. Morrell-Falvey, Thomas G. Platt, and Ryan R. Hansen
Posted 6 January 2020, bioRxiv; doi: https://doi.org/10.1101/2020.01.03.894477
Understanding the consequences of microbe-microbe interactions is critical in efforts to predict the function of microbiomes and to manipulate or construct communities to achieve desired outcomes. The investigation of these interactions poses a significant challenge – in part due to the lack of suitable experimental tools. We present the Microwell Recovery Array, a high throughput approach designed to rapidly screen interactions across a microbiome and uncover higher-order combinations of strains that either inhibit or promote the function of a GFP-producing focal species. One experiment generates 104 unique microbial communities that contain a focal species combined with a unique combination of previously uncharacterized cells from plant rhizosphere. Cells are then sequentially extracted from individual co-culture wells that display highest or lowest levels of focal species function using a novel high-resolution photopolymer extraction system. Microbes present are subsequently identified and the putative interactions are validated. Using this approach, we screen the Populus trichocarpa rhizosphere for bacterial strains affecting the survival and growth of Pantoea sp. YR343, a plant growth promoting strain isolated from the P. trichocarpa rhizosphere. We were able to simultaneously isolate and validate multiple Stenotrophomonas strains that antagonize strain YR343 growth and a set of Enterobacter strains that promote strain YR343 growth. The latter demonstrates the unique ability of the platform to uncover multi-membered consortia that generate emergent phenotypes. This knowledge will inform the development of beneficial consortia that promote the production of Populus biofuel feedstock, while the platform is adaptable to screening higher-order interactions in any microbiome of interest.