Quorum sensing N-acyl-homoserine lactone signal molecules of plant beneficial Gram-negative rhizobacteria support plant growth and resistance to pathogens

Summary

This review by Hartmann (2020) synthesises evidence on how quorum sensing—a bacterial cell-to-cell communication mechanism mediated by N-acyl-homoserine lactone molecules—operates in plant-beneficial Gram-negative rhizobacteria to enhance crop growth and disease suppression. The work suggests that AHL-dependent signalling is central to the rhizosphere mechanisms by which these bacteria exert biocontrol and biostimulant effects, though the specific mechanisms and field-scale efficacy remain topics of ongoing investigation.

UK applicability

The findings are relevant to UK sustainable farming practice, as they illuminate soil microbial mechanisms that underpin biological disease control and plant growth promotion—outcomes of interest to organic and regenerative farming systems. However, field validation under UK climatic and soil conditions would be needed to translate laboratory insights into agronomic recommendations.

Key measures

Plant growth metrics; pathogen resistance measures; bacterial quorum sensing molecule (AHL) production and signalling activity

Outcomes reported

The study examined how N-acyl-homoserine lactone (AHL) signal molecules produced by Gram-negative rhizobacteria influence plant growth promotion and disease resistance. As suggested by the title, the research measured plant growth parameters and pathogen resistance outcomes in relation to bacterial quorum sensing activity.

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