New Fertilizer and Industrial Microbial Technology Based on Microbial Metabolites

A special issue of Metabolites (ISSN 2218-1989). This special issue belongs to the section "Microbiology and Ecological Metabolomics".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 6000

Special Issue Editor

School of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China
Interests: new fertilizer

Special Issue Information

Dear Colleagues,

During the last decade, metabolomics has developed from an emerging field to an essential one. Plant-growth-promoting rhizobacteria (PGPR) are naturally occurring soil bacteria that colonize plant roots, which is an important environment for plant–microbe interactions. PGPR have attracted special attention for their ability to enhance productivity, sustainability, and profitability when food security and rural livelihood are a key priority. During the PGPR’s fermentation processes, small molecules (primary and secondary metabolites, with molecular masses ≤ 1500 Da) change in both profile and types of bioactive compounds. Bioactive molecules result in modifications of PGPR-based biofertilizer properties. Metabolite profile patterns can thus provide a holistic signature of the biofertilizer state under study as well as deeper knowledge of specific biochemical processes.

This Special Issue is devoted to “Microbiology and Ecological Metabolomics”, and the topics that will be covered include (not exclusively) studies on the metabolomic analyses of PGPR responses to fermentation conditions, such as fermentation broth, temperature, and stresses; mechanisms of host adaptation to the metabolics, such as polyglutamic acid, γ-amino butyric acid, and spermidine; and mitigation effects of abiotic stresses, such as heat and salt and drought.

Dr. Nan Gao
Guest Editor

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Keywords

  • new fertilizer
  • industrial microbial technology
  • microbial metabolites
  • metabolic networks
  • abiotic stress adaption
  • plant-growth-promoting rhizobacteria

Published Papers (2 papers)

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Research

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12 pages, 1662 KiB  
Article
Certain Tomato Root Exudates Induced by Pseudomonas stutzeri NRCB010 Enhance Its Rhizosphere Colonization Capability
by Huanhuan Zhang, Donghui Zheng, Chun Hu, Wenwen Cheng, Peng Lei, Hong Xu and Nan Gao
Metabolites 2023, 13(5), 664; https://doi.org/10.3390/metabo13050664 - 16 May 2023
Cited by 1 | Viewed by 1118
Abstract
Plant growth-promoting rhizobacteria (PGPR) can colonize plant root surfaces or form biofilms to promote plant growth and enhance plant resistance to harsh external environments. However, plant–PGPR interactions, especially chemical signaling molecules, are poorly understood. This study aimed to gain an in-depth understanding of [...] Read more.
Plant growth-promoting rhizobacteria (PGPR) can colonize plant root surfaces or form biofilms to promote plant growth and enhance plant resistance to harsh external environments. However, plant–PGPR interactions, especially chemical signaling molecules, are poorly understood. This study aimed to gain an in-depth understanding of the rhizosphere interaction mechanisms between PGPR and tomato plants. This study found that inoculation with a certain concentration of Pseudomonas stutzeri significantly promoted tomato growth and induced significant changes in tomato root exudates. Furthermore, the root exudates significantly induced NRCB010 growth, swarming motility, and biofilm formation. In addition, the composition of the root exudates was analyzed, and four metabolites (methyl hexadecanoate, methyl stearate, 2,4-di-tert-butylphenol, and n-hexadecanoic acid) significantly related to the chemotaxis and biofilm formation of NRCB010 were screened. Further assessment showed that these metabolites positively affected the growth, swarming motility, chemotaxis, or biofilm formation of strain NRCB010. Among these, n-hexadecanoic acid induced the most remarkable growth, chemotactic response, biofilm formation, and rhizosphere colonization. This study will help develop effective PGPR-based bioformulations to improve PGPR colonization and crop yields. Full article
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Review

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12 pages, 1119 KiB  
Review
The Role of Plant Growth-Promoting Microorganisms (PGPMs) and Their Feasibility in Hydroponics and Vertical Farming
by Faten Dhawi
Metabolites 2023, 13(2), 247; https://doi.org/10.3390/metabo13020247 - 09 Feb 2023
Cited by 11 | Viewed by 4316
Abstract
There are many reasons for the increase in hydroponics/soil-free systems in agriculture, and these systems have now advanced to the form of vertical farming. The sustainable use of space, the reduction in water use compared to soil-based agriculture, the lack of pesticides, the [...] Read more.
There are many reasons for the increase in hydroponics/soil-free systems in agriculture, and these systems have now advanced to the form of vertical farming. The sustainable use of space, the reduction in water use compared to soil-based agriculture, the lack of pesticides, the ability to control nutrient inputs, and the implementation of user-friendly technology for environmental control and harvesting are all factors that have made the global market for vertical farming predicted to reach more than USD 10.02 billion by 2027. By comparison, soil-based agriculture consumes 20 times more water, and some agricultural practices promote soil deterioration and cause environmental pollution. Plant growth-promoting microorganisms (PGPMs) have been used extensively in traditional agriculture to enhance plant growth, environmental stress tolerance, and the efficacy of phytoremediation in soil-based farming. Due to the controlled atmosphere in hydroponics and vertical farms, there is strong potential to maximize the use of PGPMs. Here, we review the leveraging of plant growth-promoting microorganism mechanisms in hydroponics and vertical farming. We recommend a synchronized PGPM treatment using a biostimulant extract added to the hydroponic medium while also pre-treating seeds or seedlings with a microbial suspension for aquaponic and aeroponic systems. Full article
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