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Microorganisms
Special Issues
The Bacteriostatic Effect and Mechanism of Microbial Secondary Metabolites
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The Bacteriostatic Effect and Mechanism of Microbial Secondary Metabolites

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

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 6847

Special Issue Editor

Prof. Dr. Li Zhu

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Guest Editor
Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region (Ministry of Education), Collaborative Innovation Center for Mountain Ecology and Agro-Bioengineering (CICMEAB), College of Life Sciences/Institute of Agro-Bioengineering, Guizhou University, Guiyang 550025, China
Interests: isolation and identification of pathogenic microorganisms; microbial metabolism; bioinformatics; fermentation production; high-throughput screening; genetic engineering
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Microbial secondary metabolites, which are characterized as being of a wide variety, structural diversity and broad-spectrum activity, can profoundly affect microbial physiology, metabolism and stress responses and have been widely used in agriculture. Microbial secondary metabolites are valuable resources and have great developmental prospects. Seeking out microbial secondary metabolites with a broader antibacterial activity and elucidating their action mechanisms at different levels, such as metabolic pathways and molecular mechanisms, can provide solutions for crop diseases that are prominent in the agricultural field. This Special Issue is intended to provide a collection of the latest advances in antimicrobial secondary metabolites in the field of microbiology and their applications in biological control.

We sincerely invite the latest research reviews and original research papers in the field on microbial secondary metabolites, their antimicrobial activity and biological control. The main research topics of the Special Issue are: isolation and identification of microbial metabolites, breeding of high-yielding strains of microbial metabolites, bacteriostatic activity of secondary metabolites, microbial metabolic pathways and biological control. We will also consider relevant research on important plant diseases or pathogens.

Prof. Dr. Li Zhu
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.

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Published Papers (2 papers)

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Research

16 pages, 2613 KiB  
Article
Aspergillus niger Fermentation Broth Promotes Maize Germination and Alleviates Low Phosphorus Stress
by Maoxian Tian, Changhui Zhang, Zhi Zhang, Tao Jiang, Xiaolan Hu, Hongbo Qiu and Zhu Li
Microorganisms 2023, 11(7), 1737; https://doi.org/10.3390/microorganisms11071737 - 2 Jul 2023
Viewed by 2509
Abstract
Aspergillus niger is a type of soil fungus with the ability to dissolve insoluble phosphate and secrete organic metabolites such as citric acid. However, whether cell-free Aspergillus niger fermentation broth (AFB) promotes maize growth and alleviates low-phosphorus stress has not been reported. In [...] Read more.
Aspergillus niger is a type of soil fungus with the ability to dissolve insoluble phosphate and secrete organic metabolites such as citric acid. However, whether cell-free Aspergillus niger fermentation broth (AFB) promotes maize growth and alleviates low-phosphorus stress has not been reported. In this study, we explored their relationship through a hydroponics system. The results indicated that either too low or too high concentrations of AFB may inhibit seed germination potential and germination rate. Under low phosphorus conditions, all physiological indexes (biomass, soluble sugar content, root length, etc.) increased after AFB was applied. A qRT-PCR analysis revealed that the expression of the EXPB4 and KRP1 genes, which are involved in root development, was upregulated, while the expression of the CAT2 and SOD9 genes, which are keys to the synthesis of antioxidant enzymes, was downregulated. The expression of LOX3, a key gene in lipid peroxidation, was down-regulated, consistent with changes in the corresponding enzyme activity. These results indicate that the application of AFB may alleviate the oxidative stress in maize seedlings, reduce the oxidative damage caused by low P stress, and enhance the resistance to low P stress in maize seedlings. In addition, it reveals the potential of A. niger to promote growth and provides new avenues for research on beneficial plant-fungal interactions. Full article
(This article belongs to the Special Issue The Bacteriostatic Effect and Mechanism of Microbial Secondary Metabolites)
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13 pages, 2641 KiB  
Article
Identification of a New Pathogenic fungi Causing Sorghum Leaf Spot Disease and Its Management Using Natural Product and Microorganisms
by Guoyu Wei, Wei Zhao, Anlong Hu, Mingjian Ren, Yunxiao Huang and Huayang Xu
Microorganisms 2023, 11(6), 1431; https://doi.org/10.3390/microorganisms11061431 - 29 May 2023
Cited by 8 | Viewed by 2725
Abstract
Sorghum bicolor is cultivated worldwide. Leaf spot of sorghum, which leads to leaf lesions and yield reduction, is a prevalent and serious disease in Guizhou Province, southwest China. In August 2021, new leaf spot symptoms were observed on sorghum leaves. In this study, [...] Read more.
Sorghum bicolor is cultivated worldwide. Leaf spot of sorghum, which leads to leaf lesions and yield reduction, is a prevalent and serious disease in Guizhou Province, southwest China. In August 2021, new leaf spot symptoms were observed on sorghum leaves. In this study, traditional methods and modern molecular biology techniques were used to isolate and identify the pathogen. Sorghum inoculated with the isolate GY1021 resulted in reddish brown lesion that similar to symptoms observed in the field: the original isolate inoculated was reisolated and Koch’s postulates were fulfilled. Based on morphological features and phylogenetic analysis of the internal transcribed spacer (ITS) combined sequence with β-tubulin (TUB2) and translation elongation factor 1-α (TEF-1α) genes, the isolate was identified as Fusarium thapsinum (Strain accession: GY 1021; GenBank Accession: ITS (ON882046), TEF-1α (OP096445), and β-TUB (OP096446)). Then, we studied the bioactivity of various natural products and microorganisms against F. thapsinum using the dual culture experiment. Carvacrol, 2-allylphenol, honokiol, and cinnamaldehyde showed excellent antifungal activity, with EC50 values of 24.19, 7.18, 46.18, and 52.81 µg/mL, respectively. The bioactivity of six antagonistic bacteria was measured using a dual culture experiment and the mycelial growth rate method. Paenibacillus polymyxa, Bacillus amyloliquefaciens and Bacillus velezensis displayed significant antifungal effects against F. thapsinum. This study provides a theoretical basis for the green control of leaf spot of sorghum. Full article
(This article belongs to the Special Issue The Bacteriostatic Effect and Mechanism of Microbial Secondary Metabolites)
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