Bacteria must 'feel' and 'smell' a plant root at the same time before they decide to call it home.
April 14, 2026
Original Paper
The gac system integrates physical and chemical cues to promote plant root attachment
bioRxiv · 10.64898/2026.04.10.717875
The Takeaway
Bacteria use a sensory hub to integrate physical touch and chemical signals. They won't commit to attaching unless both signals are present, showing a level of calculated decision-making previously thought impossible for single-celled organisms.
From the abstract
Plants host complex communities of microbes that are attached to root surfaces. While many studies have sampled mutant populations after prolonged incubation on roots to identify bacterial genes that enable long-term colonization, the molecular mechanisms governing the early stages root attachment remain less understood. Here, we developed an in vitro root culture system that enables controlled and scalable investigation of bacterial attachment to root tissue. We used this platform to perform a