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Exploring overlooked growth-promoting mechanisms by plant-associated bacteria
1School of Biomedical Sciences, Li KaShing Faculty of Medicine, Hong Kong University, 21 Sassoon Road, Pokfulam, SAR Hong Kong 999077, China.
Sustainable Microbiology
|August 11, 2026
Summary
Microbial cell lysis, often during sporulation, releases essential metabolites like queuine for plant benefit, challenging the idea of direct metabolite export. This process may also explain the presence of bacteriophages in microbiomes.
Area of Science:
- Microbiology
- Plant Science
- Soil Science
Background:
- Microbiome research aims to enhance plant growth and disease resistance through beneficial microbes.
- Current understanding often assumes microbes export beneficial metabolites for plant use.
- This assumption is questioned for essential metabolites due to potential resource costs for microbes.
Purpose of the Study:
- To investigate alternative mechanisms for beneficial microbial metabolite delivery to plants.
- To re-evaluate the role of microbial cell lysis in nutrient cycling within plant-associated microbiomes.
- To explore the connection between cell lysis, sporulation, and the release of vital compounds.
Main Methods:
- Focus on the Subtilis clade of Bacilli as a model system.
- Analysis of metabolite release during microbial cell lysis and sporulation.
- Investigation of queuine release and its significance as a tRNA base analog.
Main Results:
- Cell lysis, particularly during sporulation, provides direct access to intracellular microbial contents.
- This process releases essential metabolites, including queuine, which can benefit the plant host.
- The importance of cell lysis in nutrient provision is potentially underestimated.
Conclusions:
- Microbial cell lysis is a significant, overlooked mechanism for delivering essential metabolites to plants.
- Sporulation-induced lysis releases compounds like queuine, crucial for plant-associated microbial communities.
- This mechanism offers a more plausible explanation for nutrient exchange than direct export of all essential metabolites.
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