4.7 Article

Surfactin Stimulated by Pectin Molecular Patterns and Root Exudates Acts as a Key Driver of the Bacillus-Plant Mutualistic Interaction

期刊

MBIO
卷 12, 期 6, 页码 -

出版社

AMER SOC MICROBIOLOGY
DOI: 10.1128/mBio.01774-21

关键词

lipopeptides; plant cell wall polymers; plant immunity; molecular crosstalk; plant-microbe interactions

资金

  1. EU Interreg V France-Wallonie-Vlaanderen portfolio SmartBiocontrol (Bioprotect and Bioscreen projects, Avec le Soutien du Fonds Europeen de Developpement Regional-Met Steun van het Europees Fonds voor Regionale Ontwikkeling)
  2. F.R.S.-FNRS (National Fund for Scientific Research in Belgium) [26084552]
  3. Formation a la Recherche dans l'Industrie et l'Agriculture (F.R.I.A.) fellowship
  4. FWO/F.R.S.-FNRS [30650620]

向作者/读者索取更多资源

Bacillus velezensis stimulates the production of the surfactin lipopeptide upon sensing pectin as a cell surface molecular pattern and feeding on root exudates. Surfactin enhances bacterial rhizosphere fitness and primes the plant immune system, serving as a unique shared good for both partners to sustain a mutualistic interaction.
Bacillus velezensis is considered as a model species belonging to the socalled Bacillus subtilis complex that evolved typically to dwell in the soil rhizosphere niche and establish an intimate association with plant roots. This bacterium provides protection to its natural host against diseases and represents one of the most promising biocontrol agents. However, the molecular basis of the cross talk that this bacterium establishes with its natural host has been poorly investigated. We show here that these plant-associated bacteria have evolved a polymer-sensing system to perceive their host and that, in response, they increase the production of the surfactintype lipopeptide. Furthermore, we demonstrate that surfactin synthesis is favored upon growth on root exudates and that this lipopeptide is a key component used by the bacterium to optimize biofilm formation, motility, and early root colonization. In this specific nutritional context, the bacterium also modulates qualitatively the pattern of surfactin homologues coproduced in planta and forms mainly variants that are the most active at triggering plant immunity. Surfactin represents a shared good as it reinforces the defensive capacity of the host. IMPORTANCE Within the plant-associated microbiome, some bacterial species are of particular interest due to the disease protective effect they provide via direct pathogen suppression and/or stimulation of host immunity. While these biocontrol mechanisms are quite well characterized, we still poorly understand the molecular basis of the cross talk these beneficial bacteria initiate with their host. Here, we show that the model species Bacillus velezensis stimulates the production of the surfactin lipopeptide upon sensing pectin as a cell surface molecular pattern and upon feeding on root exudates. Surfactin favors bacterial rhizosphere fitness on one hand and primes the plant immune system on the other hand. Our data therefore illustrate how both partners use this multifunctional compound as a unique shared good to sustain a mutualistic interaction.

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