Chemical symphony of coumarins and phenazines in rhizosphere iron solubilization

Article Multidisciplinary Sciences

The chemical ecology of coumarins and phenazines affects iron acquisition by pseudomonads

Darcy L. McRose et al.

Summary: Secondary metabolites play important roles in plant-microbe interactions in the rhizosphere, contributing to communication, competition, and nutrient acquisition. The study investigates the distinct functions of plant and microbial Redox-Active Metabolites (RAMs) in different environmental conditions, focusing on the capacity of coumarins and phenazines to increase the growth of iron-limited pseudomonads. The results highlight the profound impact of chemical microenvironments on secondary metabolite function and suggest the ability of plants to tune the utility of microbial secondary metabolites by altering carbon released in root exudates.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2023)

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Article Multidisciplinary Sciences

Coumarin biosynthesis genes are required after foliar pathogen infection for the creation of a microbial soil-borne legacy that primes plants for SA-dependent defenses

Gilles Vismans et al.

Summary: Plants deposit carbon in the rhizosphere to create a favorable environment for microbes. Previous studies have shown that foliar infection can alter the composition of the rhizosphere microbiome. This study demonstrates that the Hpa-induced shift in the root microbiome can protect plants from downy mildew infection by activating the plant's systemic resistance. Coumarins play a prominent role in this process.

SCIENTIFIC REPORTS (2022)

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Review Plant Sciences

Coumarin Communication Along the Microbiome-Root-Shoot Axis

Max J. J. Stassen et al.

Summary: Plants shape their rhizosphere microbiome by secreting root exudates into the soil. Coumarins, root-exuded compounds, have been identified as key players in plant-microbiome communication, promoting plant growth and health through iron uptake and antimicrobial activity. Coumarins may also play a role in signaling events from the microbiome to the root and shoot, similar to other compounds like strigolactones and flavonoids.

TRENDS IN PLANT SCIENCE (2021)

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Article Plant Sciences

Coumarin accumulation and trafficking in Arabidopsis thaliana: a complex and dynamic process

Kevin Robe et al.

Summary: This study investigated the localization, secretion, and transport mechanisms of Fe-mobilizing coumarins in plants. Different coumarins were found to be secreted in different ways in roots, and they were shown to move throughout the plant body via the xylem sap. It was also demonstrated that several plant species can uptake coumarins present in the surrounding media.

NEW PHYTOLOGIST (2021)

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Review Agronomy

Pseudomonas simiae WCS417: star track of a model beneficial rhizobacterium

Corne M. J. Pieterse et al.

Summary: WCS417, an important strain of Pseudomonas fluorescens group, has played a key role in understanding the molecular mechanisms of plant-microbe interactions, plant growth promotion, and induced resistance. Studies have shown that WCS417 has significant effects on root colonization, plant immune regulation, and plant growth promotion.

PLANT AND SOIL (2021)

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Article Microbiology