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Wenneker, M.; Verdel, M.S.W.; Groeneveld, R.M.W.; Kempenaar, C.; Beuningen, A.R. van; Janse, J.

doi:10.1023/a:1008795417575

Cited by 91 publications

(29 citation statements)

References 13 publications

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“…However, Hayward (1991) observed that Ralstonia species have the ability to multiply asymptomatically in numerous plant species (non-hosts), and designated these plants as “distant hosts.” The xylem vessels are not invaded in these hosts, and the bacteria either occur in the root cortex or on the root surface (Alvarez et al, 2008). They are considered reservoirs of the bacteria and include numerous weed species (Hayward, 1991; Wenneker et al, 1999). In the wider context of plant pathology, they could be considered as endophytes or epiphytes.…”

Section: Disease Occurrencementioning

confidence: 99%

Ralstonia solanacearum and R. pseudosolanacearum on Eucalyptus: Opportunists or Primary Pathogens?

Coutinho

Wingfield

2017

Front. Plant Sci.

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Ralstonia solanacearum and R. pseudosolanacearum are well known primary pathogens of herbaceous crops. Reports of wilt caused by these pathogens in tree species are limited other than on Eucalyptus species. Despite the widespread occurrence of so-called bacterial wilt on eucalypts in tropical and sub-tropical parts of Africa, Asia, and the Americas, there remain many contradictions relating to the disease. Our field observations over many years in most regions where the disease occurs on Eucalyptus show that it is always associated with trees that have been subjected to severe stress. The disease is typically diagnosed by immersing cut stems in water and observing bacterial streaming, but the identity of the bacteria within this suspension is seldom considered. To add to the confusion, pathogenicity tests on susceptible species or clones are rarely successful. When they do work, they are on small plants in greenhouse trials. It has become all to easy to attribute Eucalyptus death exclusively to Ralstonia infection. Our data strongly suggest that Ralstonia species and probably other bacteria are latent colonists commonly occurring in healthy and particularly clonally propagated eucalypts. The onset of stress factors provide the bacteria with an opportunity to develop. We believe that the resulting stress weakens the defense systems of the trees allowing Ralstonia and bacterial endophytes to proliferate. Overall our research suggests that R. solanacearum and R. pseudosolanacearum are not primary pathogens of Eucalyptus. Short of clear evidence that they are primary pathogens of Eucalyptus it is inappropriate to attribute this disease solely to infection by Ralstonia species.

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Section: Disease Occurrencementioning

confidence: 99%

Ralstonia solanacearum and R. pseudosolanacearum on Eucalyptus: Opportunists or Primary Pathogens?

Coutinho

Wingfield

2017

Front. Plant Sci.

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“…The interactions between R. solanacearum and its cultivated hosts have been well-characterised, but little is known about the behaviour of this pathogen inside wild hosts. R. solanacearum inoculation on S. dulcamara in laboratory conditions has been previously reported (Wenneker et al, 1999;Álvarez et al, 2008b;Jacobs et al, 2013). A first assay screening a large number of plant species found that 66% of S. dulcamara plants inoculated through soil drenching became infected (Álvarez et al, 2008b).…”

Section: Introductionmentioning

confidence: 99%

The Bacterial Wilt Reservoir Host Solanum dulcamara Shows Resistance to Ralstonia solanacearum Infection

et al. 2021

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Ralstonia solanacearum causes bacterial wilt, a devastating plant disease, responsible for serious losses on many crop plants. R. solanacearum phylotype II-B1 strains have caused important outbreaks in temperate regions, where the pathogen has been identified inside asymptomatic bittersweet (Solanum dulcamara) plants near rivers and in potato fields. S. dulcamara is a perennial species described as a reservoir host where R. solanacearum can overwinter, but their interaction remains uncharacterised. In this study, we have systematically analysed R. solanacearum infection in S. dulcamara, dissecting the behaviour of this plant compared with susceptible hosts such as tomato cv. Marmande, for which the interaction is well described. Compared with susceptible tomatoes, S. dulcamara plants (i) show delayed symptomatology and bacterial progression, (ii) restrict bacterial movement inside and between xylem vessels, (iii) limit bacterial root colonisation, and (iv) show constitutively higher lignification in the stem. Taken together, these results demonstrate that S. dulcamara behaves as partially resistant to bacterial wilt, a property that is enhanced at lower temperatures. This study proves that tolerance (i.e., the capacity to reduce the negative effects of infection) is not required for a wild plant to act as a reservoir host. We propose that inherent resistance (impediment to colonisation) and a perennial habit enable bittersweet plants to behave as reservoirs for R. solanacearum.

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“…and Xanthomonas. Controlling R. solanacearum is a challenge because it survives as a latent infection in indigenous weeds for many years (Hayward, 1991;Wenneker et al, 1999). However, it would also be useful to isolate and engineer filamentous phages of other pathogenic bacteria and test the potential of these phages to control the pathogens of other wild plants.…”

Section: Phages For Biological Controlmentioning

confidence: 99%

Application of filamentous phages in environment: A tectonic shift in the science and practice of ecorestoration

Sharma

Karmakar

Kumar

et al. 2019

Ecology and Evolution

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Theories in soil biology, such as plant–microbe interactions and microbial cooperation and antagonism, have guided the practice of ecological restoration (ecorestoration). Below‐ground biodiversity (bacteria, fungi, invertebrates, etc.) influences the development of above‐ground biodiversity (vegetation structure). The role of rhizosphere bacteria in plant growth has been largely investigated but the role of phages (bacterial viruses) has received a little attention. Below the ground, phages govern the ecology and evolution of microbial communities by affecting genetic diversity, host fitness, population dynamics, community composition, and nutrient cycling. However, few restoration efforts take into account the interactions between bacteria and phages. Unlike other phages, filamentous phages are highly specific, nonlethal, and influence host fitness in several ways, which make them useful as target bacterial inocula. Also, the ease with which filamentous phages can be genetically manipulated to express a desired peptide to track and control pathogens and contaminants makes them useful in biosensing. Based on ecology and biology of filamentous phages, we developed a hypothesis on the application of phages in environment to derive benefits at different levels of biological organization ranging from individual bacteria to ecosystem for ecorestoration. We examined the potential applications of filamentous phages in improving bacterial inocula to restore vegetation and to monitor changes in habitat during ecorestoration and, based on our results, recommend a reorientation of the existing framework of using microbial inocula for such restoration and monitoring. Because bacterial inocula and biomonitoring tools based on filamentous phages are likely to prove useful in developing cost‐effective methods of restoring vegetation, we propose that filamentous phages be incorporated into nature‐based restoration efforts and that the tripartite relationship between phages, bacteria, and plants be explored further. Possible impacts of filamentous phages on native microflora are discussed and future areas of research are suggested to preclude any potential risks associated with such an approach.

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Cited by 91 publications

References 13 publications

Ralstonia solanacearum and R. pseudosolanacearum on Eucalyptus: Opportunists or Primary Pathogens?

Ralstonia solanacearum and R. pseudosolanacearum on Eucalyptus: Opportunists or Primary Pathogens?

The Bacterial Wilt Reservoir Host Solanum dulcamara Shows Resistance to Ralstonia solanacearum Infection

Application of filamentous phages in environment: A tectonic shift in the science and practice of ecorestoration

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