Plant polysaccharides initiate underground crosstalk with bacilli by inducing synthesis of the immunogenic lipopeptide surfactin

Environmental Microbiology Reports
Delphine DeboisMarc Ongena

Abstract

Some plant-associated bacteria such as Bacillus sp. can protect their host from pathogen ingress and this biocontrol activity correlates with their potential to form multiple antibiotics upon in vitro growth. However, our knowledge on antibiotic production by soil bacilli evolving on roots in natural conditions is still limited. In this work, antibiome imaging first revealed that the lipopeptide surfactin is the main bacterial ingredient produced in planta within the first hours of interaction with root tissues. We further demonstrated that surfactin synthesis is specifically stimulated upon perception of plant cell wall polymers such as xylan or arabinogalactan, leading to fast accumulation of micromolar amounts in the root environment. At such concentrations, the lipopeptide may not only favour the ecological fitness of the producing strain in term of root colonization, but also triggers systemic resistance in the host plant. This surfactin-induced immunity primes the plant to better resist further pathogen ingress, and involves only limited expression of defence-related molecular events and does not provoke seedling growth inhibition. By contrast with the strong response mounted upon perception of pathogens, this strongly at...Continue Reading

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Citations

May 9, 2016·Trends in Plant Science·Yonghui DongAsaph Aharoni
May 11, 2017·Wiley Interdisciplinary Reviews. Systems Biology and Medicine·Ying-Ning HoYu-Liang Yang
Jul 30, 2019·Molecular Plant Pathology·Romain SchellenbergerStéphan Dorey
Jun 11, 2017·Environmental Science and Pollution Research International·Parent Zihalirwa KulimushiMarc Ongena
Oct 6, 2020·Frontiers in Bioengineering and Biotechnology·Jérôme CrouzetStéphan Dorey
Dec 12, 2020·Frontiers in Plant Science·Jelena Pršić, Marc Ongena
Nov 7, 2019·Analytical Chemistry·Rita de Cassia PessottiMatthew F Traxler

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