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Microorganisms
Special Issues
Plant Growth-Promoting Microorganisms for Sustainable Agriculture
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Plant Growth-Promoting Microorganisms for Sustainable Agriculture

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

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 6728

Special Issue Editors

Dr. Daniel Neuhoff

E-Mail Website1 Website2
Guest Editor
Department of Agroecology and Organic Farming, Institute of Crop Science and Resource Conservation, Faculty of Agriculture, University of Bonn, Auf dem Hügel 6, 53121 Bonn, Germany
Interests: productivity in organic crop production; crop protection
Prof. Dr. Günter Neumann

E-Mail Website
Guest Editor
Institute of Crop Science (340h), Universität Hohenheim, Fruwirthstraße 20, 70593 Stuttgart, Germany
Interests: rhizosphere plants; plant physiology; abiotic stress; plant biology; roots nitrogen; plant nutrition; root biofertilizers

Special Issue Information

Dear Colleagues,

The targeted application of selected plant-growth-promoting microorganisms (PGPM) with well-characterized beneficial properties is a promising strategy for sustainable intensification of cropping systems. Currently, farmer input markets are flooded with innumerable putative PGPM products, additionally boosted by the fertilizer crisis. However, there is little evidence that these products have significant and reproducible effects on crop growth or quality under field conditions. In this Special Issue, we exclusively look for well-documented research papers on PGPM application in cropping systems under field conditions, including arable and permanent crops. Papers may focus on physiological processes involved in plant growth promotion, farm economics, or new methodical approaches, but they have to include empirical data on crop growth and yield under field conditions. We explicitly invite the submission of manuscripts in which no effects of PGPM application are noted.

Dr. Daniel Neuhoff
Prof. Dr. Guenter Neummann
Guest Editors

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.

Keywords

  • plant-growth-promoting microorganisms
  • crop yield
  • food quality
  • mode of action
  • field trials

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Published Papers (2 papers)

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Research

23 pages, 5350 KiB  
Article
Development of a Multicomponent Microbiological Soil Inoculant and Its Performance in Sweet Potato Cultivation
by Viktor Dávid Nagy, Anuar Zhumakayev, Mónika Vörös, Ádám Bordé, Adrienn Szarvas, Attila Szűcs, Sándor Kocsubé, Péter Jakab, Tamás Monostori, Biljana D. Škrbić, Edina Mohai, Lóránt Hatvani, Csaba Vágvölgyi and László Kredics
Microorganisms 2023, 11(4), 914; https://doi.org/10.3390/microorganisms11040914 - 31 Mar 2023
Cited by 3 | Viewed by 3070
Abstract
The cultivation and consumption of sweet potato (Ipomoea batatas) are increasing globally. As the usage of chemical fertilizers and pest control agents during its cultivation may lead to soil, water and air pollution, there is an emerging need for environment-friendly, biological [...] Read more.
The cultivation and consumption of sweet potato (Ipomoea batatas) are increasing globally. As the usage of chemical fertilizers and pest control agents during its cultivation may lead to soil, water and air pollution, there is an emerging need for environment-friendly, biological solutions enabling increased amounts of healthy crop and efficient disease management. Microbiological agents for agricultural purposes gained increasing importance in the past few decades. Our goal was to develop an agricultural soil inoculant from multiple microorganisms and test its application potential in sweet potato cultivation. Two Trichoderma strains were selected: Trichoderma ghanense strain SZMC 25217 based on its extracellular enzyme activities for the biodegradation of plant residues, and Trichoderma afroharzianum strain SZMC 25231 for biocontrol purposes against fungal plant pathogens. The Bacillus velezensis strain SZMC 24986 proved to be the best growth inhibitor of most of the nine tested strains of fungal species known as plant pathogens, therefore it was also selected for biocontrol purposes against fungal plant pathogens. Arthrobacter globiformis strain SZMC 25081, showing the fastest growth on nitrogen-free medium, was selected as a component with possible nitrogen-fixing potential. A Pseudomonas resinovorans strain, SZMC 25872, was selected for its ability to produce indole-3-acetic acid, which is among the important traits of potential plant growth-promoting rhizobacteria (PGPR). A series of experiments were performed to test the selected strains for their tolerance to abiotic stress factors such as pH, temperature, water activity and fungicides, influencing the survivability in agricultural environments. The selected strains were used to treat sweet potato in two separate field experiments. Yield increase was observed for the plants treated with the selected microbial consortium (synthetic community) in comparison with the control group in both cases. Our results suggest that the developed microbial inoculant has the potential to be used in sweet potato plantations. To the best of our knowledge, this is the first report about the successful application of a fungal-bacterial consortium in sweet potato cultivation. Full article
(This article belongs to the Special Issue Plant Growth-Promoting Microorganisms for Sustainable Agriculture)
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15 pages, 803 KiB  
Article
Maize Growth Promotion by Inoculation with an Engineered Ammonium-Excreting Strain of Nitrogen-Fixing Pseudomonasstutzeri
by Shanshan Jiang, Jiang Li, Qingyu Wang, Changyan Yin, Yuhua Zhan, Yongliang Yan, Min Lin and Xiubin Ke
Microorganisms 2022, 10(10), 1986; https://doi.org/10.3390/microorganisms10101986 - 7 Oct 2022
Cited by 8 | Viewed by 2511
Abstract
Diazotroph mutants designed using metabolic engineering to excrete surplus ammonium were used to enhance nitrogen fixation and plant growth, as the levels of nitrogen fixation attained with diazotrophs are insufficient for the plant’s needs. In this study, wild-type (A1501) and engineered ammonium-excreting (1568/pVA3) [...] Read more.
Diazotroph mutants designed using metabolic engineering to excrete surplus ammonium were used to enhance nitrogen fixation and plant growth, as the levels of nitrogen fixation attained with diazotrophs are insufficient for the plant’s needs. In this study, wild-type (A1501) and engineered ammonium-excreting (1568/pVA3) strains of nitrogen-fixing Pseudomonas stutzeri strains were tested in vitro based on plant growth-promoting traits, such as phosphate solubilization ability, indole acetic acid (IAA) production and nitrogenase activities, as well as ammonium excretion as affected by mannitol-mediated osmotic stress. The maize plant growth-promoting effect of the A1501 and 1568/pVA3 strains was evaluated in pots and in the field, and the 15N-dilution technique was employed to assess the proportion of plant nitrogen derived from nitrogen fixation. The results demonstrate that the 1568/pVA3 strain displayed higher IAA production and nitrogenase activity than A1501 and released significant quantities of ammonium. After 50 days, in all of the conditions assayed, maize inoculated with 1568/pVA3 accumulated more plant biomass (3.3% on average) and fixed N (39.4% on average) than plants inoculated with A1501. In the field experiment, the grain yield of maize was enhanced by 5.6% or 5.9% due to the inoculation of seeds with 1568/pVA3 in the absence or presence of exogenous N fertilizer, respectively. Therefore, the engineered P. stutzeri strain tested in the greenhouse and field was shown to perform better than the wild-type strain with respect to maize growth parameters and biologically fixed nitrogen. Full article
(This article belongs to the Special Issue Plant Growth-Promoting Microorganisms for Sustainable Agriculture)
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