Root fungi emerge as candidates for a keystone role
· BehindLines newsroom
Which microbes can change the organisation of an entire community around roots? Researchers propose a statistical method to identify candidates. Their study, published in Nature Communications on 28 October and presented the following day by Kyoto University, draws attention to fungi living inside plant tissues.
An inventory beneath the forest
The analysis covers 1,270 root samples from a cool-temperate forest at Sugadaira, in Nagano Prefecture. The researchers analysed DNA from the fungi and bacteria present in those roots. The question goes beyond whether an organism is present: it concerns how several populations occur together.
The university notes that these underground communities contribute to ecosystem functioning, including nutrient cycles and carbon storage. Identifying the organisms that shape their structure could help researchers understand a system that is difficult to observe directly.
Associations that point to candidates
Using the data, the authors construct a mathematical landscape of possible community states. They look for organisms whose changes in abundance are associated with a reorganisation of that landscape.
Several fungal genera stand out, including Phialocephala and Oidiodendron. In the same study, European data also link the genera identified to changes in patterns of root colonisation by mycorrhizal fungi.
A lead to test in living systems
These statistical results help prioritise microbes for further study. They are not an experiment in which a fungus is removed from the forest to measure all the consequences.
That distinction matters for the next stage of research. An association that can be reproduced may guide an ecological investigation without, by itself, establishing every cause-and-effect relationship. The method therefore proposes research priorities rather than a recipe that can immediately be applied to forest management.