Special Issue "The Response of Microorganisms to Anthropogenic Disturbance and Global Change"

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Environmental Microbiology".

Deadline for manuscript submissions: 15 August 2019

Special Issue Editor

Guest Editor
Dr. David Walsh

Concordia University, Department of Biology, Montreal, Canada
Website | E-Mail
Interests: Microbial ecology and evolution;aquatic microbiology;symbiosis;genomics;metagenomics;marine hypoxia;carbon cycle;climate change

Special Issue Information

Dear Colleagues,

Microbial communities possess tremendous diversity and resilience to environmental change, a result of their long evolutionary history in a dynamic global environment. Nevertheless, in today’s world, microorganisms are faced with a novel set of challenges. Human activities are perturbing Earth’s carbon and nutrient cycles and altering many of the physical, chemical, and biological parameters that affect microbial distributions and activities. Currently it is uncertain how the microbial communities that are the foundation of Earth’s life support system will be influenced by these many anthropogenic changes. Nor is it clear how human activities may influence the dispersal and activity of microorganisms of biomedical relevance such as pathogens and environmental reservoirs of antibiotic resistance. In this Special Issue of Microorganisms, we invite you to send contributions concerning all aspect of microbial responses to anthropogenic disturbance and global change. Contributions may include primary research or up-to-date syntheses pertaining to the physiological, ecological, and evolutionary responses of microbes, ranging from individual organisms to whole communities.

Dr. David Walsh
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 papers will be 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 1000 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 (1 paper)

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Open AccessArticle The Form of N Supply Determines Plant Growth Promotion by P-Solubilizing Microorganisms in Maize
Microorganisms 2019, 7(2), 38; https://doi.org/10.3390/microorganisms7020038
Received: 28 December 2018 / Revised: 16 January 2019 / Accepted: 26 January 2019 / Published: 29 January 2019
PDF Full-text (1047 KB) | HTML Full-text | XML Full-text | Supplementary Files
Phosphate-(P)-solubilizing microorganisms (PSM) are important drivers of P cycling in natural and agro-ecosystems. Their use as plant inoculants to improve P acquisition of crops has been investigated for decades. However, limited reproducibility of the expected effects, particularly under field conditions, remains a major [...] Read more.
Phosphate-(P)-solubilizing microorganisms (PSM) are important drivers of P cycling in natural and agro-ecosystems. Their use as plant inoculants to improve P acquisition of crops has been investigated for decades. However, limited reproducibility of the expected effects, particularly under field conditions, remains a major challenge. This study demonstrates that the form of nitrogen fertilization has a significant impact on the performance of various fungal and bacterial PSM inoculants in maize grown on neutral to alkaline soils with limited P availability. Under these conditions, a high soil pH-buffering capacity frequently limits the efficiency of nutrient mobilization, mediated by plant roots and microorganisms via rhizosphere acidification. In a soil pH range between 7.0 and 8.0, nitrate fertilization promoting rhizosphere alkalinisation further aggravates this problem. Accordingly, in greenhouse experiments, six strains of Pseudomonas, Bacillus, Paenibacillus, Streptomyces, and Penicillium with proven P-solubilizing potential, completely failed to promote P acquisition in maize grown on a calcareous Loess sub-soil pH 7.6 with nitrate fertilization and rock phosphate (Rock-P) as a sparingly soluble P source. However, after replacement of nitrate fertilization by ammonium, stabilized with the nitrification inhibitor 3,4-dimethylpyrazole-phosphate (DMPP), five out of seven investigated PSM inoculants (comprising 12 fungal and bacterial PSM strains) exerted beneficial effects on plant growth and reached up to 88% of the shoot biomass production of a control supplied with soluble triple-superphosphate (TSP). Stabilized ammonium combined with PSM-inoculants improved P acquisition (Trichoderma harzianum T22, Pseudomonas sp. DMSZ 13134), while other strains particularly stimulated root growth (T. harzianum OMG16, Bacillus amyloliquefaciens FZB42), which promoted the acquisition also of other mineral nutrients, such as N, K, and Mn. A similar effect was recorded under field conditions on an alkaline clay-loam soil pH 8.6. The combination of stabilized ammonium with a range of consortium products based on T. harzianum OMG16, B. amyloliquefaciens, micronutrients, and humic acids completely compensated the effect of a TSP fertilization on field establishment, nutrient acquisition, and yield formation in maize, while non-stabilized urea-di-ammonium phosphate fertilization was largely ineffective. These findings suggest that the efficiency of PSM-plant interactions can be influenced by the form of N fertilization, offering promising perspectives for synergistic effects with stabilized ammonium fertilizers. Full article

Graphical abstract

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Anthropogenic impact and the environmental resistome
Authors: Susanne Kraemer (Concordia) and Gabriel Perron (Bard College)

Title: Microbial eukaryotes and oilsands-associated environments
Authors: Beth Richardson and Joel Dacks (University of Alberta)

Title: Microbial indicators for use in paleogenetics studies of environmental change,
Authors: David Walsh


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