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Microorganisms
Special Issues
Future Use of Antibacterial Compounds of Plant Origin
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Future Use of Antibacterial Compounds of Plant Origin

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Antimicrobial Agents and Resistance".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 4991

Special Issue Editor

Dr. Christel Neut

E-Mail Website
Guest Editor
Institute for Translational Research in Inflammation (INFINITE), Lille, France
Interests: antimicrobial compounds;plant origin;chemical definition; toxicity; in vivo applications; synergy with antibiotics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the era of steadily increasing antimicrobial resistance, the need for new antimicrobial substances is becoming more and more urgent. They can be of natural or synthetic origin, but natural substances are often favored because they co-exist with living organisms for a long time, which is in favor of a lower toxicity. Their long-lasting use in traditional medicines is another argument for low toxicity.

This Special Issue will focus on plant compounds with antibacterial activity, mainly publishing articles with a focus on antibacterial activity, antifungal activity, and antiparasitic experimental data.

After a first description of in vitro activities, the active compounds need to be purified and chemically defined before advancing to applications in various fields (clinical application, food technology, etc.), which can be ensured by studies on their lack of toxicity.

When antibiotics and new natural compounds use different targets for their activity, synergy studies will be of outstanding interest, as they can reveal the possibility of efficient use of antibiotics in the presence of a natural booster.

Dr. Christel Neut
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.

Keywords

  • antimicrobial compounds
  • plant origin
  • chemical definition
  • toxicity
  • in vivo applications
  • synergy with antibiotics

Published Papers (2 papers)

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Research

15 pages, 2172 KiB  
Article
Carvacrol and Thymol Combat Desiccation Resistance Mechanisms in Salmonella enterica Serovar Tennessee
by Ahmed G. Abdelhamid and Ahmed E. Yousef
Microorganisms 2022, 10(1), 44; https://0-doi-org.brum.beds.ac.uk/10.3390/microorganisms10010044 - 26 Dec 2021
Cited by 2 | Viewed by 2548
Abstract
Some Salmonella enterica serovars are frequently associated with disease outbreaks in low-moisture foods (LMF) due to their ability to adapt efficiently to desiccation stress. These serovars are often persistent during food processing. Disruption of these resistance responses was accomplished previously using the membrane-active [...] Read more.
Some Salmonella enterica serovars are frequently associated with disease outbreaks in low-moisture foods (LMF) due to their ability to adapt efficiently to desiccation stress. These serovars are often persistent during food processing. Disruption of these resistance responses was accomplished previously using the membrane-active lipopeptide, paenibacterin. This study was initiated to determine how desiccation resistance mechanisms are overcome when Salmonella Tennessee, a known resistant serovar, is treated with the membrane-active food additives carvacrol and thymol. Knowing that the minimum inhibitory concentrations (MICs) of carvacrol and thymol against Salmonella Tennessee are 200 and 100 µg/mL, the concentrations tested were 100–400 and 50–200 µg/mL, respectively. Results show that desiccation-adapted Salmonella Tennessee, prepared by air drying at 40% relative humidity and 22–25 °C for 24 h, was not inactivated when exposed for 4.0 h to less than 2xMIC of the two additives. Additionally, treatment of desiccation-adapted Salmonella Tennessee for 120 min with carvacrol and thymol at the MIC-level sensitized the cells (1.4–1.5 log CFU/mL reduction) to further desiccation stress. Treating desiccation-adapted Salmonella Tennessee with carvacrol and thymol induced leakage of intracellular potassium ions, reduced the biosynthesis of the osmoprotectant trehalose, reduced respiratory activity, decreased ATP production, and caused leakage of intracellular proteins and nucleic acids. Carvacrol, at 200–400 µg/mL, significantly downregulated the transcription of desiccation-related genes (proV, STM1494, and kdpA) as determined by the reverse-transcription quantitative PCR. The current study revealed some of the mechanisms by which carvacrol and thymol combat desiccation-resistant Salmonella Tennessee, raising the feasibility of using these additives to control desiccation-adapted S. enterica in LMF. Full article
(This article belongs to the Special Issue Future Use of Antibacterial Compounds of Plant Origin)
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25 pages, 5093 KiB  
Article
PeaT1 and PeBC1 Microbial Protein Elicitors Enhanced Resistance against Myzus persicae Sulzer in Chili Capsicum annum L.
by Khadija Javed, Talha Humayun, Ayesha Humayun, Yong Wang and Humayun Javed
Microorganisms 2021, 9(11), 2197; https://0-doi-org.brum.beds.ac.uk/10.3390/microorganisms9112197 - 21 Oct 2021
Cited by 8 | Viewed by 1819
Abstract
The green peach aphid (Myzus persicae Sulzer), a major and harmful chili aphid usually managed using chemical pesticides, is responsible for massive annual agricultural losses. The efficacy of two protein elicitors, PeaT1 and PeBC1, to stimulate a defensive response against M. persicae [...] Read more.
The green peach aphid (Myzus persicae Sulzer), a major and harmful chili aphid usually managed using chemical pesticides, is responsible for massive annual agricultural losses. The efficacy of two protein elicitors, PeaT1 and PeBC1, to stimulate a defensive response against M. persicae in chili was studied in this study. When compared to positive (water) and negative (buffer, 50 mM Tris-HCl, pH 8.0) controls, the rates of population growth (intrinsic rate of increase) of M. persicae (second and third generations) were lower with PeaT1- and PeBC1-treated chilli seedlings. M. persicae demonstrated a preference for colonizing control (12.18 ± 0.06) plants over PeaT1- (7.60 ± 0.11) and PeBC1 (6.82 ± 0.09) treated chilli seedlings in a host selection assay. Moreover, PeaT1- and PeBC1-treated chilli seedlings, the nymphal development period of the M. persicae was extended. Similarly, fecundity was lowered in the PeaT1- and PeBC1-treated chilli seedlings, with fewer offspring produced compared to the positive (water) and negative controls (50 mM Tris-HCl, pH 8.0). The trichomes and wax production on the PeaT1 and PeBC1-treated chilli leaves created a disadvantageous surface environment for M. persicae. Compared to control (30.17 ± 0.16 mm−2), PeaT1 (56.23 ± 0.42 mm−2) and PeBC1 (52.14 ± 0.34 mm−2) had more trichomes. The levels of jasmonic acid (JA), salicylic acid (SA), and ethylene (ET) were significantly higher in the PeaT1- and PeBC1-treated chili seedlings, indicating considerable accumulation. PeaT1 and PeBC1 significantly affected the height of the chili plant and the surface structure of the leaves, reducing M. persicae reproduction and preventing colonization, according to the data. The activation of pathways was also part of the defensive response (JA, SA, and ET). This present research findings established an evidence of biocontrol for the utilization of PeaT1 and PeBC1 in the defence of chili plants against M. persicae. Full article
(This article belongs to the Special Issue Future Use of Antibacterial Compounds of Plant Origin)
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