Ecology, Evolution, Epidemiology and Genomics of R. solanacearum Plant Pathogenic Bacterium

A special issue of Pathogens (ISSN 2076-0817). This special issue belongs to the section "Bacterial Pathogens".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 4021

Special Issue Editors

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Guest Editor
University of York, York, United Kingdom
Interests: microbial genomics; population genomics and quantitative genetics; molecular evolution; fission yeast; Leishmania; Ralstonia

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Guest Editor
Department of Biology, University of York, Heslington, York YO10 5DD, UK
Interests: evolution; experimental evolution; coevolution; ecology; microbiology; microbiomes; pathogens; phages; bacteria; protists; plants; eco-evolutionary dynamics; plant-microbe interactions
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Special Issue Information

Dear Colleagues,

Ralstonia solanacearum is an economically important and globally spread plant pathogenic bacterium causing significant crop losses annually. It has a very broad host range covering over 200 plant species and complex epidemiology including important environmental reservoirs and non-agricultural secondary host plants. It harbors various intricate virulence factors and is genetically highly variable showing signs of local adaptation to specific host plants and environmental niches. Infections are also often linked with its ability to invade plant rhizosphere microbiomes by competing for shared resources and by resisting natural enemies. Despite increased interest in developing novel biocontrol methods to protect crops from this pathogen, we still lack efficient control methods. One reason for this is that the ecology, evolution and complex epidemiology of R. solanacearum is still not properly understood. For this Special Issue of Pathogens, we invite you to submit research articles, review articles, short notes as well as communications related to ecology, evolution, pathology and genomics of Ralstonia. We are especially interested in interdisciplinary approaches focusing on pathogen-microbiome-plant interactions, pathogen-microbe interactions, comparative genomics, experimental evolution, biocontrol, transmission and epidemiology across natural and agricultural environments. We look forward to your contribution.

Dr. Daniel Jeffares
Dr. Ville-Petri Friman
Guest Editors

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  • Ralstonia
  • Plant pathogenic bacteria
  • Ecology
  • Evolution
  • Genomics
  • Virulence Host range
  • Epidemiology
  • Microbiome
  • Transmission
  • Biocontrol

Published Papers (1 paper)

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18 pages, 2695 KiB  
Sustainable and Ecofriendly Approach of Managing Soil Born Bacterium Ralstonia solanacearum (Smith) Using Dried Powder of Conyza canadensis
by Ke Chen, Raja Asad Ali Khan, Wen Cao and Meng Ling
Pathogens 2020, 9(5), 327; - 27 Apr 2020
Cited by 8 | Viewed by 2996
Bacterial wilt disease caused by Ralstonia solanacearum is a devastating plant disease that inflicts heavy losses to the large number of economic host plants it infects. The potential of dried powder of the Conyza canadensis to control bacterial wilt (BW) of tomato was [...] Read more.
Bacterial wilt disease caused by Ralstonia solanacearum is a devastating plant disease that inflicts heavy losses to the large number of economic host plants it infects. The potential of dried powder of the Conyza canadensis to control bacterial wilt (BW) of tomato was explored in vitro and in planta. Three application times (16 days before transplanting (DBT), 8 DBT and 0 DBT), three plastic-mulch durations (10 days plastic mulching (DPM), 5DPM and 0DPM) and four doses viz. 0 g, 8 g, 16 g and 24 g of the plant powder were evaluated. SEM analysis was also conducted to observe the change in bacterial cell morphology. Ethanol extract of dried C. canadensis in different concentrations inhibited the in vitro growth of R. solanacearum by as much as 98% of that produced by ampicillin. As evident from the scanning electron micrograph, the highest concentration produced severe morphologic changes, such as rupture of the bacterial cell walls and cell contents leaked out. Results from application time and dose experiment demonstrated that the highest powder dose viz. 24 g kg−1 mixed with infested soil 16 DBT gave maximum root length (34.0 ± 2.5 cm), plant height (74.3 ± 4.7 cm), fresh biomass (58.3 ± 4.3 g), reduction in bacterial population (1.52 log10) and resulted in lowest AUDPC value (1156.6). In case of mulching duration and dose experiment the maximum root length (39.6 ± 3.2 cm), plant height (78.3 ± 5.8 cm), fresh biomass (65.6 ± 4.9 g) reduction in bacterial population (1.59 log10) and lowest AUDPC value (1251.6) was achieved through the application of highest powder dose viz. 24 g kg−1 and longest plastic mulching duration of 10 DPM. The better results of highest dose and longer application time can be explained on the basis of higher amounts of anti-microbial plant bio-active compounds in highest dose and the longer exposure time of the pathogen to these chemicals. The better results of longer mulching duration are due to faster and more complete decomposition (because of 10-days-long plastic-mulch-provided increased solar heat) of the dried powder which produced more amounts of volatile and non-volatile bactericidal compounds. Our results clearly suggest that the use of 24 g kg−1 dried plant powder of C. canadensis plastic-mulched for two weeks could be used as a reliable component of the integrated disease management program against BW. Full article
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