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Microorganisms
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Interactions between Plant Beneficial Pseudomonas spp. and Their Host 2.0
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Interactions between Plant Beneficial Pseudomonas spp. and Their Host 2.0

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Plant Microbe Interactions".

Deadline for manuscript submissions: 15 June 2024 | Viewed by 3236

Special Issue Editor

Dr. Martin Filion

E-Mail Website
Guest Editor
Science and Technology Branch, Saint-Jean-sur-Richelieu Research and Development Centre, Agriculture and Agri-Food Canada, Government of Canada, 430 Gouin Boul., Saint-Jean-sur-Richelieu, QC J3B 3E6, Canada
Interests: Pseudomonas; rhizosphere; plant-microbe interactions; biocontrol; plant-growth promotion; rhizocompetence
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is the continuation of our previous special issue "Interactions between Plant Beneficial Pseudomonas spp. and Their Host"

Plant-beneficial Pseudomonas spp. are aerobic, Gram-negative bacteria that are ubiquitously found in soils. They are particularly well suited for plant root colonization and many strains display plant growth-promoting and/or biocontrol activity against various plant pathogens. Their ability to metabolize a wide array of nutrients, their rapidity and ease of growth, and their natural abundance in a variety of plant-soil environments make them promising organisms for the development of commercial biocontrol and biofertilizer products.

The aim of this Special Issue is to give a platform for researchers to discuss various aspects related to the ecology, diversity, physiology and genetics of plant-beneficial Pseudomonas spp., while putting special emphasis on the mechanisms involved in biocontrol and/or plant growth promotion. Novel insights and innovative research on these organisms, including recent progress in genomics, transcriptomics and metabolomics, are welcomed.

For this purpose, we cordially invite you to submit research articles, review articles and short communications related to the various aspects of plant-beneficial Pseudomonas spp. and their interactions with their host.

Dr. Martin Filion
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Microorganisms is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (2 papers)

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Research

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15 pages, 3822 KiB  
Article
Plant-Root Exudate Analogues Influence Activity of the 1-Aminocyclopropane-1-Carboxylate (ACC) Deaminase Gene in Pseudomonas hormoni G20-18T
by Ajay Madhusudan Sorty, Fani Ntana, Martin Hansen and Peter Stougaard
Microorganisms 2023, 11(10), 2504; https://doi.org/10.3390/microorganisms11102504 - 06 Oct 2023
Viewed by 1013
Abstract
Plants exposed to abiotic stress such as drought and salinity produce 1-aminocyclopropane-1-carboxylic acid (ACC) that is converted into the stress hormone ethylene. However, plant growth-promoting bacteria (PGPB), which synthesize the enzyme ACC deaminase, may lower the ACC concentration thereby reducing the concentration of [...] Read more.
Plants exposed to abiotic stress such as drought and salinity produce 1-aminocyclopropane-1-carboxylic acid (ACC) that is converted into the stress hormone ethylene. However, plant growth-promoting bacteria (PGPB), which synthesize the enzyme ACC deaminase, may lower the ACC concentration thereby reducing the concentration of ethylene and alleviating the abiotic stress. The PGPB Pseudomonas hormoni G20-18T (previously named P. fluorescens G20-18) harbors the genes acdR and acdS that encode regulation and synthesis of ACC deaminase, respectively. Regulation of the acdS gene has been investigated in several studies, but so far, it has been an open question whether plants can regulate microbial synthesis of ACC deaminase. In this study, small molecules in wheat root exudates were identified using untargeted metabolomics, and compounds belonging to amino acids, organic acids, and sugars were selected for evaluation of their influence on the expression of the acdS and acdR genes in P. hormoni G20-18T. acdS and acdR promoters were fused to the fluorescence reporter gene mCherry enabling the study of acdS and acdR promoter activity. In planta studies in wheat seedlings indicated an induced expression of acdS in association with the roots. Exudate molecules such as aspartate, alanine, arginine, and fumarate as well as glucose, fructose, and mannitol actively induced the acdS promoter, whereas the plant hormone indole-3-acetic acid (IAA) inhibited expression. Here, we present a model for how stimulatory and inhibitory root exudate molecules influence acdS promoter activity in P. hormoni G20-18T. Full article
(This article belongs to the Special Issue Interactions between Plant Beneficial Pseudomonas spp. and Their Host 2.0)
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Review

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17 pages, 3784 KiB  
Review
T6SS: A Key to Pseudomonas’s Success in Biocontrol?
by Edwin D. Navarro-Monserrat and Christopher G. Taylor
Microorganisms 2023, 11(11), 2718; https://doi.org/10.3390/microorganisms11112718 - 07 Nov 2023
Cited by 1 | Viewed by 1534
Abstract
Bacteria from the genus Pseudomonas have been extensively studied for their capacity to act as biological control agents of disease and pests and for their ability to enhance and promote crop production in agricultural systems. While initial research primarily focused on the human [...] Read more.
Bacteria from the genus Pseudomonas have been extensively studied for their capacity to act as biological control agents of disease and pests and for their ability to enhance and promote crop production in agricultural systems. While initial research primarily focused on the human pathogenic bacteria Pseudomonas aeruginosa, recent studies indicate the significance of type VI secretion (T6SS) in other Pseudomonas strains for biocontrol purposes. This system possibly plays a pivotal role in restricting the biological activity of target microorganisms and may also contribute to the bolstering of the survival capabilities of the bacteria within their applied environment. The type VI secretion system is a phage-like structure used to translocate effectors into both prokaryotic and eukaryotic target cells. T6SSs are involved in a myriad of interactions, some of which have direct implications in the success of Pseudomonas as biocontrol agents. The prevalence of T6SSs in the genomes of Pseudomonas species is notably greater than the estimated 25% occurrence rate found in Gram-negative bacteria. This observation implies that T6SS likely plays a pivotal role in the survival and fitness of Pseudomonas. This review provides a brief overview of T6SS, its role in Pseudomonas with biocontrol applications, and future avenues of research within this subject matter. Full article
(This article belongs to the Special Issue Interactions between Plant Beneficial Pseudomonas spp. and Their Host 2.0)
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