Scientists have identified the mechanisms that allow plants to change their root anatomy to maximise survival when nutrients are scarce. The findings could pave the way for developing new ways to improve beneficial plant-microbe interactions in agriculture.
Roots naturally vary in how complex their cross-sectional anatomy is – from the thick woody root of a mangrove to the fine hair-like strands of a spring onion or a duckweed.
A new study from the University of Nottingham's School of Biosciences has shown that how complex this layout of cells in a root is determines its ability to remodel itself upon colonisation by microbes, creating a microhabitat the plant can change in response to bacteria. This structural plasticity, in turn, enables plants to adapt their roots to challenging nutrient conditions.
The research, published today in Nature Communications highlights the importance of root microhabitat complexity for microbiome recruitment under challenging environmental conditions.
In natural ecosystems, plant roots and soil microbiota engage in a continuous chemical dialogue. Through this communication, roots and microbes establish close associations that can profoundly influence root development and function.
Plant roots, which are functionally similar to the animal gut, are colonized by communities of diverse and metabolically active microbes. The researchers found that microbial colonisation triggers extensive metabolic reprogramming alongside anatomical changes, which regulate root anatomical plasticity in response to interactions with microbes.
Dr Gabriel Castrillo is lead author on the paper and explains: "Our findings highlight the importance of both root anatomical and metabolic complexity in shaping plant–microbiome interactions, particularly under environmental stress. This knowledge could ultimately be harnessed to optimise beneficial plant–microbe interactions, improve root architecture, and enhance plant resilience to adverse conditions.
"For example, synthetic biology approaches could be used to precisely control the production of key metabolites that serve as carbon sources for beneficial microbes. Beyond regulating metabolite levels, these approaches may also offer a way to selectively enhance specific features of root anatomy while preserving essential root functions, including interactions with the microbiota."
Combined with the direct application of N6,N6,N6-trimethyl-L-lysine, such strategies could provide new ways to steer root–microbe interactions toward beneficial outcomes.
Together, these advances and our growing understanding of the chemical dialogue between plants and their microbiota could contribute to the development of microbiome-based strategies with the potential to improve agricultural productivity and resilience.
