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Issue 6, 2019
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Unraveling the photoactive annihilation mechanism of nanostructures as effective green tools for inhibiting the proliferation of the phytopathogenic bacterium Pseudomonas syringae

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Abstract

The infectious proliferation of phytopathogenic microorganisms depends on a complex sequence of biological events involving host defense, environmental conditions, and chemical and physical interactions between the surface of a plant and microorganisms, which in numerous cases display resistance to conventional microbicides. Among these microorganisms, Pseudomonas syringae (P. syringae) is a Gram-negative bacterium that attacks wounded parts of plants before invading healthy tissues. In order to control P. syringae, considering it to be a phytopathogenic model, an effective method featuring silver nanoparticles (AgNPs) functionalized on titanate nanotubes (Nts) used as photoactive antibacterial agents was investigated to understand the effective photoactive annihilation mechanism. The high dispersion of AgNPs over the Nts boosted charge carrier separation by generating reactive oxygen species (ROS) under visible-light, which stressed the bacteria and enhanced the biocidal effect by quickly preventing the rod-shaped P. syringae bacteria from proliferating. Biological transmission and scanning electron microscopy revealed damaged P. syringae cells that underwent the formation of outer membrane vesicles, caused by photo-assisted annihilation, which is considered to be an indication of a critical defense mechanism. The unusual synergistic properties of the Nts, and their low cost and practical synthesis, made these nanocomposites promising green tools that can positively and swiftly photokill P. syringae within 30 min.

Graphical abstract: Unraveling the photoactive annihilation mechanism of nanostructures as effective green tools for inhibiting the proliferation of the phytopathogenic bacterium Pseudomonas syringae

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Article information


Submitted
26 Oct 2018
Accepted
14 Apr 2019
First published
15 Apr 2019

This article is Open Access

Nanoscale Adv., 2019,1, 2258-2267
Article type
Paper

Unraveling the photoactive annihilation mechanism of nanostructures as effective green tools for inhibiting the proliferation of the phytopathogenic bacterium Pseudomonas syringae

S. Casas-Flores, R. B. Domínguez-Espíndola, R. Camposeco-solis, O. A. Patrón-Soberano and V. Rodríguez-González, Nanoscale Adv., 2019, 1, 2258
DOI: 10.1039/C8NA00307F

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