Eberl L and Vandamme P. Members of the genus Burkholderia: good and bad guys [version 1; peer review: 3 approved]. F1000Research 2016, 5(F1000 Faculty Rev):1007 (https://doi.org/10.12688/f1000research.8221.1)
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1Department of Plant and Microbial Biology, University Zürich, Zurich, CH-8008, Switzerland 2Laboratory of Microbiology, Ghent University, Ledeganckstraat 35, B-9000 Gent, Belgium
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Abstract
In the 1990s several biocontrol agents on that contained Burkholderia strains were registered by the United States Environmental Protection Agency (EPA). After risk assessment these products were withdrawn from the market and a moratorium was placed on the registration of Burkholderia-containing products, as these strains may pose a risk to human health. However, over the past few years the number of novel Burkholderia species that exhibit plant-beneficial properties and are normally not isolated from infected patients has increased tremendously. In this commentary we wish to summarize recent efforts that aim at discerning pathogenic from beneficial Burkholderia strains.
Corresponding author:
Leo Eberl
Competing interests:
The authors declare that they have no competing interests.
Grant information:
Financial support from the Swiss National Fund (Project 3100A0-104215) to Leo Eberl is gratefully acknowledged.
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
When the genus Burkholderia was defined in 1992 by Yabuuchi et al. to accommodate most of the former rRNA group II pseudomonads, it consisted of only seven species1. Two of these species (Burkholderia pseudomallei and Burkholderia mallei) are primary pathogens of animals and humans, two species (Burkholderia caryophylli and Burkholderia gladioli) are known as plant pathogens, two species (Burkholderia solanacearum [a plant pathogen] and Burkholderia pickettii [an opportunistic human pathogen]) were later transferred to the genus Ralstonia, and the remaining species, Burkholderia cepacia, was originally described as the causative agent of bacterial rot of onion bulbs2. Since the first description of the genus, the number of validly named species has increased to almost one hundred (http://www.bacterio.net/burkholderia.html). During this time, it has become apparent that this genus has tremendous biotechnological potential, with species that produce a large variety of commercially important hydrolytic enzymes and bioactive substances, that promote plant growth and health, and that can degrade various recalcitrant pollutants. Yet their agricultural and industrial use is severely limited due to the potential threat that some strains pose to human health3. In addition to B. pseudomallei and B. mallei, it is a group of currently 20 closely related bacterial species in particular, referred to as the Burkholderia cepacia complex (Bcc), which have emerged as opportunistic pathogens that can cause severe infections in cystic fibrosis (CF) and immunocompromised patients4–6. However, virtually all Bcc species have also been isolated from the natural environment, often from soil samples or from the rhizosphere of various plants. The use of Burkholderia in agricultural applications is therefore considered a double-edged sword, and a lot of effort has been invested into discriminating between the beneficial environmental (the good) and the clinical (the bad) Burkholderia strains7,8. Recently, these efforts have gained momentum, as many new Burkholderia species have been identified in environmental samples that exhibit potentially valuable beneficial traits. These species are believed to be safe for applications, as there are very rarely clinical reports that they would pose a risk to human health.
Burkholderia species in the environment
Recent work has shown that members of the genus Burkholderia are common soil inhabitants and that their biogeographic distribution is strongly affected by soil pH9–12. Due to their intrinsic acid tolerance, Burkholderia strains have a competitive advantage in acidic soils but are outcompeted in alkaline soils. Moreover, it has been reported that Burkholderia significantly co-occurs with a wide range of fungi, which normally also prefer acidic environments13. This finding is in line with reports demonstrating that many Burkholderia species can form either antagonistic or mutualistic interactions with fungi. While antagonistic behavior of Burkholderia species is well described and is dependent on the production of a large variety of antifungal compounds (for a review, see 14), other species have been demonstrated to live in mutualistic associations with fungi. A well-investigated example is represented by the association of Burkholderia terrae and Lyophyllum species, for which it was shown that the bacteria can not only use the hyphae of the fungus for transportation and dispersal but also use fungal exudates as nutrients15–17. This is in full agreement with the finding that Burkholderia strains are among the main consumers of carbon released from arbuscular mycorrhizal fungi18. Another intriguing example is Burkholderia rhizoxinica, which invades hyphae of the fungus Rhizopus microsporus19,20, the causative agent of rice seedling blight. The symbiont is involved in the biosynthesis of the antimitotic toxin rhizoxin21, which efficiently stalls plant cell division. In the absence of the endosymbiont, the fungus was found to be unable to reproduce vegetatively22.
Another emerging theme is the tight association of some Burkholderia species with plants. Over the past few years, the number of novel plant-associated Burkholderia species has increased tremendously. These new species show various degrees of plant dependence, with some strains living freely in the rhizosphere, exhibiting an endophytic lifestyle, nodulating legumes, or, most intriguingly, forming an obligate leaf symbiosis with their host plants. Burkholderia species have been frequently isolated from diverse surface-sterilized plants (e.g. 23–27). Probably the best studied endophytic Burkholderia strain is Burkholderia phytofirmans PsJN, which was originally isolated from onion roots and was subsequently demonstrated to establish endophytic populations in various plants28,29. Interestingly, B. phytofirmans is not only capable of protecting plants from pathogens (through an unknown mechanism) but was also shown to increase the plants’ stress resistance, particularly against low temperatures, high salt, and drought30–32. Some Burkholderia species have been shown to be specifically associated with Sphagnum mosses33,34. Since Moulin et al. demonstrated that two Burkholderia species, which were isolated from root nodules of a legume, possessed nodulation genes35, many more nodulating Burkholderia species have been described (for recent studies, see 36–38). Although these strains have mainly been isolated from Mimosa species, recent work showed that some Burkholderia strains can also nodulate fynbos legumes in South Africa39–43. Some plant genera of the Rubiaceae and Primulaceae families carry members of the genus Burkholderia within leaf nodules44–47. This unique association is the only known example of an obligate plant-bacterium symbiosis with both partners being unable to exist outside the symbiotic association. The bacterial symbiont is thought to be hereditarily transmitted to the progeny via colonization of the developing seeds. Although the molecular nature of the leaf nodule symbiosis is still unknown, it was recently shown that the bacterial symbiont produces large amounts of secondary metabolites, which appear to protect the plants from herbivores48,49.
Finally, a large body of evidence demonstrates that many insect species harbor symbiotic bacteria of the genus Burkholderia50–53. The association of Burkholderia species with the bean bug Riptortus pedestris has emerged as a promising experimental model to study the molecular mechanisms involved in insect-bacterium symbiosis54,55. This symbiosis appears to be particularly tight, as it was recently reported that the insect has a previously unrecognized animal organ used to specifically sort the symbiont into the posterior gut region, which is devoid of food flow and is transformed into an isolated organ for symbiosis56.
We are convinced that these examples represent just the tip of the iceberg and that many more Burkholderia fungus/plant/insect associations will be discovered in the future.
Can we tell the good from the bad by taxonomy?
Phylogenetic investigations have provided evidence that members of the genus Burkholderia can be divided into two main lineages (Figure 1) and several species that represent unique lines of descent. One clade comprises pathogens of humans, animals, and plants, including B. pseudomallei, B. mallei, and Burkholderia glumae, as well as the Bcc species. However, this clade also contains many strains that can be used for plant growth promotion and biocontrol of plant pests, including Burkholderia vietnamiensis TVV74 and Burkholderia ambifaria AMMD, respectively57. Ironically, although Burkholderia cenocepacia is generally considered the most problematic Bcc species in patients with CF58, recently a genome sequence of a plant-beneficial endophytic B. cenocepacia strain with both biocontrol and plant-growth-promoting characteristics was reported59. Also, non-Bcc Burkholderia species within this clade can have both beneficial and harmful properties. One intriguing case with great potential for agricultural applications is represented by Burkholderia gladioli, which is a well-known pathogen of plants (e.g. causing rice panicle blight)60 as well as humans61–63. However, recent work has demonstrated that some B. gladioli strains live endophytically within various wild and ancient Zea plants without causing any disease symptoms64,65. In contrast, this endophyte was shown to produce an unidentified antifungal compound in planta and was able to suppress the fungal pathogen Sclerotinia homoeocarpa66.
The second main phylogenetic Burkholderia cluster contains many plant-beneficial environmental Burkholderia species, as mentioned above67. Several of these species have been reported to fix nitrogen, to be capable of nodulating legumes, to promote plant growth, and to degrade recalcitrant compounds68. Given that species of this cluster are only rarely isolated from infected patients69–71, they are often considered to pose no risk to human health and have therefore been suggested to be promising candidates for applications in biocontrol, biofertilization, and bioremediation72–74. In our opinion, this is a wishful, potentially dangerous, and certainly oversimplified view.
Figure 1. Maximum-likelihood phylogenetic reconstruction based on 16S rRNA gene sequences of 55 Burkholderia species and Ralstonia solanacearum LMG 2299T (outgroup).
The alignment was performed using SINA v1.2.11 (http://www.arb-silva.de/aligner/)93. After gap removal with TrimAl94, the final alignment consisted of 1289 positions. The phylogenetic reconstruction was conducted with MEGA695 using Tamura-Nei evolutionary model96 with gamma rate distribution (five gamma categories and 70% of invariable sites). Bootstrap test values are shown if greater than 50%. Some phenotypic characteristics are indicated. No boxes indicate that no information is available. The information on the presence of the type III secretion system is taken from 73.
Dividing the genus Burkholderia into two genera was recently proposed, with the novel genus Paraburkholderia containing the primarily environmental species (the alleged good ones) to demarcate them from Burkholderia sensu stricto, which comprises environmental, human clinical, and phytopathogenic species (the alleged bad ones)72. In this study, the percentage guanine plus cytosine content and conserved indels in whole genome sequences of some 25 formally named Burkholderia species and several unclassified strains were studied. Species belonging to the Burkholderia sensu stricto clade were characterized by a percentage guanine plus cytosine content of 65 to 69% and shared six conserved sequence indels, while all other Burkholderia strains examined had a percentage guanine plus cytosine content of 61 to 65% and shared two conserved sequence indels. The phylogenetic heterogeneity among the remaining Burkholderia species as revealed by 16S rRNA-based divergence and by differences in the distribution of 22 additional conserved sequence indels was ignored, as the authors proposed reclassifying all remaining Burkholderia species into a single novel genus, Paraburkholderia72. These novel names were subsequently validated75 and now have formal standing in bacterial nomenclature. The scientific community may adopt these novel names or not. Authors who are convinced that these name changes are ill founded can continue to work with the original species names, as all these were validly published.
A recent study employed comparative genomics to assess the pathogenic potential of environmental strains on the basis of the presence or absence of known virulence factors73. This bioinformatic study clearly showed that many virulence factors, including the type III, IV, and VI secretion systems, are mostly found in representatives of the Burkholderia sensu stricto clade while they are often absent in strains of the Paraburkholderia clade. The authors also show that Paraburkholderia strains exhibit no virulence in a Caenorhabditis elegans infection model. While these are valuable approaches, they also have their caveats. Many virulence factors of Burkholderia species have been shown to be host specific, and there is little correlation between the different infection models commonly used, e.g. C. elegans, Galleria mellonella, and Drosophila melanogaster. This probably reflects the need for Burkholderia strains to compete for survival in diverse habitats such as soil, plants, insects, and mammalian hosts. Only very few universal virulence factors could be identified in B. cenocepacia (namely quorum sensing, siderophore production, and lipopolysaccharide biosynthesis) and therefore extrapolations from non-mammalian infection models to mammalian infections, particularly to chronic CF lung infections, must be made with caution76,77. For example, most Burkholderia multivorans strains show no virulence in a C. elegans or G. mellonella infection model78,79, although most virulence factors that were suggested to be indicative for pathogenic Burkholderia species could be identified in this Bcc species73. Yet B. multivorans (along with B. cenocepacia) is one of the predominant Burkholderia species infecting people with CF58,80. On the other hand, B. cenocepacia strain H11181, which is closely related to strains of the epidemic ET12 lineage (e.g. J2315 and K56-2), did not cause acute symptoms in the infected CF patient from whom it was isolated and was cleared after a 6-month co-infection period with Pseudomonas aeruginosa82, while infections with strains of the ET12 lineage have resulted in high mortality among patients58,83. In contrast to its clinical impact, strain H111 shows a similar level of pathogenicity in the G. mellonella and C. elegans infection models to K56-2 (an ET12 lineage strain) and both strains are much more virulent in these models than J2315 (another ET12 lineage strain)77.
These examples strongly suggest that neither the presence of virulence genes in a strain nor acute virulence as assessed in routinely used non-mammalian infection models is an absolutely reliable predictor of clinical prevalence or outcome in CF patients. The taxonomic position of a strain is also not an unambiguous indicator for its pathogenic potential and thus decisions on the industrial or biotechnological use of a Burkholderia strain can be made only on a case-by-case basis after careful molecular and phenotypic characterization of the strain. On the comparative genomics side, it will be interesting to see whether the co-occurrence of certain genes may be a suitable indicator of the phenotypic potential of a strain, as has recently been proposed in the case of plant-growth-promoting bacteria84.
The use of Burkholderia as biocontrol agents
Although endophytic or nitrogen-fixing Burkholderia strains show great promise as agents for plant growth promotion and bioremediation, it should be kept in mind that in terms of biocontrol applications the most outstanding property of Burkholderia strains is the production of various compounds with potent antifungal activity14,85. In fact, several Bcc strains have been registered by the United States Environmental Protection Agency (EPA) for use as biocontrol agents against phytopathogenic fungi, including Deny®, Blue Circle®, and Intercept®, in the 1990s. However, after risk assessment, these products were withdrawn from the market and the EPA placed a moratorium on the registration of products containing Bcc species (https://www.gpo.gov/fdsys/pkg/FR-2004-09-29/pdf/04-21695.pdf). Would it be possible to replace these Bcc-based biocontrol agents with strains of the Paraburkholderia lineage? Literature research, genome mining, and experimental evidence (Figure 1) have revealed that only three species of the Paraburkholderia cluster, namely Burkholderia phenazinium, Burkholderia megapolitana, and Burkholderia bryophila, all of which have been isolated from mosses86, show antifungal activity. In contrast, most strains of the Bcc and many of the human and plant pathogenic species produce antifungal compounds85. Given that most antifungal agents exhibit more general toxic effects in eukaryotic organisms, these compounds may contribute to the virulence of a strain. B. phenazinium was reported to produce the phenazine iodinin87, which exhibits not only high anti-microbial but also cytotoxic activity. While iodinin may be valuable for clinical purposes, as it is potent against leukemia cell lines88, it may not be useful for biocontrol applications. To our knowledge, the antifungal compounds produced by B. megapolitana and B. bryophila have not been identified nor has their pathogenic potential been evaluated in an infection model. In conclusion, while many Bcc strains have been demonstrated to exhibit excellent biocontrol activities, there are only very few Paraburkholderia strains that are potentially useful for biocontrol purposes.
Is there a safe Burkholderia strain?
Given the lack of reported cases in the literature, many strains of the Paraburkholderia lineage seem unlikely to cause infections in humans and therefore could be considered for agricultural applications. The same may also apply to some strains of the Burkholderia lineage, as has recently been suggested for the Bcc strain Burkholderia contaminans MS14, which was found to possess multiple antimicrobial biosynthesis genes but not major genetic loci required for pathogenesis89. While the phylogenetic status of a strain may be helpful as a first approximation of the pathogenic potential of a strain, it is clear that the Paraburkholderia lineage contains some pathogenic strains and that several Bcc strains exhibit good biocontrol properties and attenuated virulence. Hence, independent of a strain’s phylogenetic status, a thorough characterization of a strain will be required before it can be considered safe. It will be important to use well-established infection models such as the mouse model90 for the assessment of the potential pathogenicity of a strain and to carefully examine whether related strains have been isolated from infected humans. Likewise, the biocontrol activity of the strain has to be tested in field trials. It is also worth noting that several species of the Paraburkholderia clade, including the well-investigated endophyte B. phytofirmans, are unable to grow at 37°C (in contrast to Burkholderia sensu stricto species), a property that is considered to be essential to infect and colonize humans. The capability to grow at 37°C has recently been proposed as a simple means to differentiate between pathogenic and non-pathogenic Stenotrophomonas maltophilia and Stenotrophomonas rhizophila isolates91. Representatives of the latter species have therefore been suggested to provide an alternative to biotechnological applications without posing any risk to human health92. An important line of future research will therefore be to assess the pathogenicity of environmental strains in suitable infection models, particularly using a mammalian host at 37°C, and ideally in multispecies infection scenarios, which may more accurately reflect the genuine clinical situation.
Competing interests
The authors declare that they have no competing interests.
Grant information
Financial support from the Swiss National Fund (Project 3100A0-104215) to Leo Eberl is gratefully acknowledged.
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Acknowledgements
We are grateful to Marta Pinto for generating the phylogenetic tree shown in Figure 1. We would like to thank all present and past members of our working groups for their various contributions.
Faculty Opinions recommended
References
1.
Yabuuchi E, Kosako Y, Oyaizu H, et al.:
Proposal of Burkholderia gen. nov. and transfer of seven species of the genus Pseudomonas homology group II to the new genus, with the type species Burkholderia cepacia (Palleroni and Holmes 1981) comb. nov.
Microbiol Immunol.
1992; 36(12): 1251–75. PubMed Abstract
| Publisher Full Text
2.
Burkholder WH:
Sour skin, a bacterial rot of Onion bulbs.
Phytopathology.
1950; 40(1): 115–117. Reference Source
3.
Mahenthiralingam E, Urban TA, Goldberg JB:
The multifarious, multireplicon Burkholderia cepacia complex.
Nat Rev Microbiol.
2005; 3(2): 144–56. PubMed Abstract
| Publisher Full Text
4.
Vandamme P, Peeters C:
Time to revisit polyphasic taxonomy.
Antonie Van Leeuwenhoek.
2014; 106(1): 57–65. PubMed Abstract
| Publisher Full Text
5.
Peeters C, Zlosnik JE, Spilker T, et al.:
Burkholderia pseudomultivorans sp. nov., a novel Burkholderia cepacia complex species from human respiratory samples and the rhizosphere.
Syst Appl Microbiol.
2013; 36(7): 483–9. PubMed Abstract
| Publisher Full Text
6.
De Smet B, Mayo M, Peeters C, et al.:
Burkholderia stagnalis sp. nov. and Burkholderia territorii sp. nov., two novel Burkholderia cepacia complex species from environmental and human sources.
Int J Syst Evol Microbiol.
2015; 65(7): 2265–71. PubMed Abstract
| Publisher Full Text
7.
Baldwin A, Mahenthiralingam E, Drevinek P, et al.:
Environmental Burkholderia cepacia complex isolates in human infections.
Emerg Infect Dis.
2007; 13(3): 458–61. PubMed Abstract
| Publisher Full Text
| Free Full Text
8.
Mahenthiralingam E, Baldwin A, Dowson CG:
Burkholderia cepacia complex bacteria: opportunistic pathogens with important natural biology.
J Appl Microbiol.
2008; 104(6): 1539–51. PubMed Abstract
| Publisher Full Text
9.
Stopnisek N, Bodenhausen N, Frey B, et al.:
Genus-wide acid tolerance accounts for the biogeographical distribution of soil Burkholderia populations.
Environ Microbiol.
2014; 16(6): 1503–12. PubMed Abstract
| Publisher Full Text
13.
Stopnisek N, Zühlke D, Carlier A, et al.:
Molecular mechanisms underlying the close association between soil Burkholderia and fungi.
ISME J.
2016; 10(1): 253–64. PubMed Abstract
| Publisher Full Text
| Free Full Text
14.
Vial L, Groleau MC, Dekimpe V, et al.:
Burkholderia diversity and versatility: an inventory of the extracellular products.
J Microbiol Biotechnol.
2007; 17(9): 1407–29. PubMed Abstract
15.
Warmink JA, van Elsas JD:
Migratory response of soil bacteria to Lyophyllum sp. strain Karsten in soil microcosms.
Appl Environ Microbiol.
2009; 75(9): 2820–30. PubMed Abstract
| Publisher Full Text
| Free Full Text
16.
Nazir R, Warmink JA, Voordes DC, et al.:
Inhibition of mushroom formation and induction of glycerol release-ecological strategies of Burkholderia terrae BS001 to create a hospitable niche at the fungus Lyophyllum sp. strain Karsten.
Microb Ecol.
2013; 65(1): 245–54. PubMed Abstract
| Publisher Full Text
18.
Drigo B, Kowalchuk GA, Knapp BA, et al.:
Impacts of 3 years of elevated atmospheric CO2 on rhizosphere carbon flow and microbial community dynamics.
Glob Chang Biol.
2013; 19(2): 621–36. PubMed Abstract
| Publisher Full Text
21.
Scherlach K, Partida-Martinez LP, Dahse HM, et al.:
Antimitotic rhizoxin derivatives from a cultured bacterial endosymbiont of the rice pathogenic fungus Rhizopus microsporus.
J Am Chem Soc.
2006; 128(35): 11529–36. PubMed Abstract
| Publisher Full Text
| Faculty Opinions Recommendation
22.
Partida-Martinez LP, Monajembashi S, Greulich KO, et al.:
Endosymbiont-dependent host reproduction maintains bacterial-fungal mutualism.
Curr Biol.
2007; 17(9): 773–7. PubMed Abstract
| Publisher Full Text
23.
Banik A, Mukhopadhaya SK, Dangar TK:
Characterization of N2-fixing plant growth promoting endophytic and epiphytic bacterial community of Indian cultivated and wild rice (Oryza spp.) genotypes.
Planta.
2016; 243(3): 799–812. PubMed Abstract
| Publisher Full Text
| Faculty Opinions Recommendation
27.
Weisskopf L, Heller S, Eberl L:
Burkholderia species are major inhabitants of white lupin cluster roots.
Appl Environ Microbiol.
2011; 77(21): 7715–20. PubMed Abstract
| Publisher Full Text
| Free Full Text
28.
Sessitsch A, Coenye T, Sturz AV, et al.:
Burkholderia phytofirmans sp. nov., a novel plant-associated bacterium with plant-beneficial properties.
Int J Syst Evol Microbiol.
2005; 55(Pt 3): 1187–92. PubMed Abstract
| Publisher Full Text
29.
Compant S, Reiter B, Sessitsch A, et al.:
Endophytic colonization of Vitis vinifera L. by plant growth-promoting bacterium Burkholderia sp. strain PsJN.
Appl Environ Microbiol.
2005; 71(4): 1685–93. PubMed Abstract
| Publisher Full Text
| Free Full Text
33.
Bragina A, Cardinale M, Berg C, et al.:
Vertical transmission explains the specific Burkholderia pattern in Sphagnum mosses at multi-geographic scale.
Front Microbiol.
2013; 4: 394. PubMed Abstract
| Publisher Full Text
| Free Full Text
34.
Bragina A, Berg C, Berg G:
The core microbiome bonds the Alpine bog vegetation to a transkingdom metacommunity.
Mol Ecol.
2015; 24(18): 4795–807. PubMed Abstract
| Publisher Full Text
35.
Moulin L, Munive A, Dreyfus B, et al.:
Nodulation of legumes by members of the beta-subclass of Proteobacteria.
Nature.
2001; 411(6840): 948–50. PubMed Abstract
| Publisher Full Text
36.
Sheu SY, Chou JH, Bontemps C, et al.:
Burkholderia diazotrophica sp. nov., isolated from root nodules of Mimosa spp.
Int J Syst Evol Microbiol.
2013; 63(Pt 2): 435–41. PubMed Abstract
| Publisher Full Text
37.
Sheu SY, Chen MH, Liu WY, et al.:
Burkholderia dipogonis sp. nov., isolated from root nodules of Dipogon lignosus in New Zealand and Western Australia.
Int J Syst Evol Microbiol.
2015; 65(12): 4716–23. PubMed Abstract
| Publisher Full Text
38.
Bournaud C, de Faria SM, dos Santos JM, et al.:
Burkholderia species are the most common and preferred nodulating symbionts of the Piptadenia group (tribe Mimoseae).
PLoS One.
2013; 8(5): e63478. PubMed Abstract
| Publisher Full Text
| Free Full Text
39.
Elliott GN, Chen WM, Bontemps C, et al.:
Nodulation of Cyclopia spp. (Leguminosae, Papilionoideae) by Burkholderia tuberum.
Ann Bot.
2007; 100(7): 1403–11. PubMed Abstract
| Publisher Full Text
| Free Full Text
40.
De Meyer SE, Cnockaert M, Ardley JK, et al.:
Burkholderia rhynchosiae sp. nov., isolated from Rhynchosia ferulifolia root nodules.
Int J Syst Evol Microbiol.
2013; 63(Pt 11): 3944–9. PubMed Abstract
| Publisher Full Text
41.
De Meyer SE, Tian R, Seshadri R, et al.:
High-quality permanent draft genome sequence of the Lebeckia ambigua-nodulating Burkholderia sp. strain WSM4176.
Stand Genomic Sci.
2015; 10: 79. PubMed Abstract
| Publisher Full Text
| Free Full Text
42.
Lemaire B, Van Cauwenberghe J, Verstraete B, et al.:
Characterization of the papilionoid-Burkholderia interaction in the Fynbos biome: The diversity and distribution of beta-rhizobia nodulating Podalyria calyptrata (Fabaceae, Podalyrieae).
Syst Appl Microbiol.
2016; 39(1): 41–8. PubMed Abstract
| Publisher Full Text
| Faculty Opinions Recommendation
43.
Lemaire B, Dlodlo O, Chimphango S, et al.:
Symbiotic diversity, specificity and distribution of rhizobia in native legumes of the Core Cape Subregion (South Africa).
FEMS Microbiol Ecol.
2015; 91(2): 1–17. PubMed Abstract
| Publisher Full Text
| Faculty Opinions Recommendation
44.
Van Oevelen S, De Wachter R, Vandamme P, et al.:
Identification of the bacterial endosymbionts in leaf galls of Psychotria (Rubiaceae, angiosperms) and proposal of 'Candidatus Burkholderia kirkii' sp. nov.
Int J Syst Evol Microbiol.
2002; 52(Pt 6): 2023–7. PubMed Abstract
| Publisher Full Text
45.
Lemaire B, Vandamme P, Merckx V, et al.:
Bacterial leaf symbiosis in angiosperms: host specificity without co-speciation.
PLoS One.
2011; 6(9): e24430. PubMed Abstract
| Publisher Full Text
| Free Full Text
46.
Lemaire B, Van Oevelen S, De Block P, et al.:
Identification of the bacterial endosymbionts in leaf nodules of Pavetta (Rubiaceae).
Int J Syst Evol Microbiol.
2012; 62(Pt 1): 202–9. PubMed Abstract
| Publisher Full Text
47.
Verstraete B, Janssens S, Lemaire B, et al.:
Phylogenetic lineages in Vanguerieae (Rubiaceae) associated with Burkholderia bacteria in sub-Saharan Africa.
Am J Bot.
2013; 100(12): 2380–7. PubMed Abstract
| Publisher Full Text
48.
Carlier A, Fehr L, Pinto M, et al.:
The genome analysis of CandidatusBurkholderia crenata reveals that secondary metabolism may be a key function of the Ardisia crenata leaf nodule symbiosis.
Environ Microbiol.
2015. PubMed Abstract
| Publisher Full Text
49.
Sieber S, Carlier A, Neuburger M, et al.:
Isolation and Total Synthesis of Kirkamide, an Aminocyclitol from an Obligate Leaf Nodule Symbiont.
Angew Chem Int Ed Engl.
2015; 54(27): 7968–70. PubMed Abstract
| Publisher Full Text
50.
Santos AV, Dillon RJ, Dillon VM, et al.:
Ocurrence of the antibiotic producing bacterium Burkholderia sp. in colonies of the leaf-cutting ant Atta sexdens rubropilosa.
FEMS Microbiol Lett.
2004; 239(2): 319–23. PubMed Abstract
| Publisher Full Text
51.
Kikuchi Y, Meng XY, Fukatsu T:
Gut symbiotic bacteria of the genus Burkholderia in the broad-headed bugs Riptortus clavatus and Leptocorisa chinensis (Heteroptera: Alydidae).
Appl Environ Microbiol.
2005; 71(7): 4035–43. PubMed Abstract
| Publisher Full Text
| Free Full Text
52.
Kikuchi Y, Hosokawa T, Fukatsu T:
An ancient but promiscuous host-symbiont association between Burkholderia gut symbionts and their heteropteran hosts.
ISME J.
2011; 5(3): 446–60. PubMed Abstract
| Publisher Full Text
| Free Full Text
57.
Parke JL, Gurian-Sherman D:
Diversity of the Burkholderia cepacia complex and implications for risk assessment of biological control strains.
Annu Rev Phytopathol.
2001; 39: 225–58. PubMed Abstract
| Publisher Full Text
60.
Naughton LM, An SQ, Hwang I, et al.:
Functional and genomic insights into the pathogenesis of Burkholderia species to rice.
Environ Microbiol.
2016; 18(3): 780–90. PubMed Abstract
| Publisher Full Text
61.
Zhou F, Ning H, Chen F, et al.:
Burkholderia gladioli infection isolated from the blood cultures of newborns in the neonatal intensive care unit.
Eur J Clin Microbiol Infect Dis.
2015; 34(8): 1533–7. PubMed Abstract
| Publisher Full Text
62.
Imataki O, Kita N, Nakayama-Imaohji H, et al.:
Bronchiolitis and bacteraemia caused by Burkholderia gladioli in a non-lung transplantation patient.
New Microbes New Infect.
2014; 2(6): 175–6. PubMed Abstract
| Publisher Full Text
| Free Full Text
63.
Segonds C, Clavel-Batut P, Thouverez M, et al.:
Microbiological and epidemiological features of clinical respiratory isolates of Burkholderia gladioli.
J Clin Microbiol.
2009; 47(5): 1510–6. PubMed Abstract
| Publisher Full Text
| Free Full Text
64.
Johnston-Monje D, Raizada MN:
Conservation and diversity of seed associated endophytes in Zea across boundaries of evolution, ethnography and ecology.
PLoS One.
2011; 6(6): e20396. PubMed Abstract
| Publisher Full Text
| Free Full Text
66.
Shehata HR, Lyons EM, Jordan KS, et al.:
Bacterial endophytes from wild and ancient maize are able to suppress the fungal pathogen Sclerotinia homoeocarpa.
J Appl Microbiol.
2016; 120(3): 756–69. PubMed Abstract
| Publisher Full Text
| Faculty Opinions Recommendation
67.
Suárez-Moreno ZR, Caballero-Mellado J, Coutinho BG, et al.:
Common features of environmental and potentially beneficial plant-associated Burkholderia.
Microb Ecol.
2012; 63(2): 249–66. PubMed Abstract
| Publisher Full Text
68.
Pérez-Pantoja D, Nikel PI, Chavarría M, et al.:
Endogenous stress caused by faulty oxidation reactions fosters evolution of 2,4-dinitrotoluene-degrading bacteria.
PLoS Genet.
2013; 9(8): e1003764. PubMed Abstract
| Publisher Full Text
| Free Full Text
69.
Coenye T, Goris J, Spilker T, et al.:
Characterization of unusual bacteria isolated from respiratory secretions of cystic fibrosis patients and description of Inquilinus limosus gen. nov., sp. nov.
J Clin Microbiol.
2002; 40(6): 2062–9. PubMed Abstract
| Publisher Full Text
| Free Full Text
71.
Deris ZZ, Van Rostenberghe H, Habsah H, et al.:
First isolation of Burkholderia tropica from a neonatal patient successfully treated with imipenem.
Int J Infect Dis.
2010; 14(1): e73–4. PubMed Abstract
| Publisher Full Text
72.
Sawana A, Adeolu M, Gupta RS:
Molecular signatures and phylogenomic analysis of the genus Burkholderia: proposal for division of this genus into the emended genus Burkholderia containing pathogenic organisms and a new genus Paraburkholderia gen. nov. harboring environmental species.
Front Genet.
2014; 5: 429. PubMed Abstract
| Publisher Full Text
| Free Full Text
74.
Estrada-de los Santos P, Vinuesa P, Martínez-Aguilar L, et al.:
Phylogenetic analysis of burkholderia species by multilocus sequence analysis.
Curr Microbiol.
2013; 67(1): 51–60. PubMed Abstract
| Publisher Full Text
75.
Oren A, Garrity GM:
List of new names and new combinations previously effectively, but not validly, published.
Int J Syst Evol Microbiol.
2015; 65(11): 3763–7. PubMed Abstract
| Publisher Full Text
76.
Schwager S, Agnoli K, Köthe M, et al.:
Identification of Burkholderia cenocepacia strain H111 virulence factors using nonmammalian infection hosts.
Infect Immun.
2013; 81(1): 143–53. PubMed Abstract
| Publisher Full Text
| Free Full Text
77.
Uehlinger S, Schwager S, Bernier SP, et al.:
Identification of specific and universal virulence factors in Burkholderia cenocepacia strains by using multiple infection hosts.
Infect Immun.
2009; 77(9): 4102–10. PubMed Abstract
| Publisher Full Text
| Free Full Text
78.
Cardona ST, Wopperer J, Eberl L, et al.:
Diverse pathogenicity of Burkholderia cepacia complex strains in the Caenorhabditis elegans host model.
FEMS Microbiol Lett.
2005; 250(1): 97–104. PubMed Abstract
| Publisher Full Text
79.
Seed KD, Dennis JJ:
Development of Galleria mellonella as an alternative infection model for the Burkholderia cepacia complex.
Infect Immun.
2008; 76(3): 1267–75. PubMed Abstract
| Publisher Full Text
| Free Full Text
81.
Carlier A, Agnoli K, Pessi G, et al.:
Genome Sequence of Burkholderia cenocepacia H111, a Cystic Fibrosis Airway Isolate.
Genome Announc.
2014; 2(2): pii: e00298-14. PubMed Abstract
| Publisher Full Text
| Free Full Text
82.
Geisenberger O, Givskov M, Riedel K, et al.:
Production of N-acyl-L-homoserine lactones by P. aeruginosa isolates from chronic lung infections associated with cystic fibrosis.
FEMS Microbiol Lett.
2000; 184(2): 273–8. PubMed Abstract
83.
Drevinek P, Mahenthiralingam E:
Burkholderia cenocepacia in cystic fibrosis: epidemiology and molecular mechanisms of virulence.
Clin Microbiol Infect.
2010; 16(7): 821–30. PubMed Abstract
| Publisher Full Text
85.
Schmidt S, Blom JF, Pernthaler J, et al.:
Production of the antifungal compound pyrrolnitrin is quorum sensing-regulated in members of the Burkholderia cepacia complex.
Environ Microbiol.
2009; 11(6): 1422–37. PubMed Abstract
| Publisher Full Text
86.
Vandamme P, Opelt K, Knöchel N, et al.:
Burkholderia bryophila sp. nov. and Burkholderia megapolitana sp. nov., moss-associated species with antifungal and plant-growth-promoting properties.
Int J Syst Evol Microbiol.
2007; 57(Pt 10): 2228–35. PubMed Abstract
| Publisher Full Text
87.
Turner JM, Messenger AJ:
Occurrence, biochemistry and physiology of phenazine pigment production.
Adv Microb Physiol.
1986; 27: 211–75. PubMed Abstract
| Publisher Full Text
88.
Sletta H, Degnes KF, Herfindal L, et al.:
Anti-microbial and cytotoxic 1,6-dihydroxyphenazine-5,10-dioxide (iodinin) produced by Streptosporangium sp. DSM 45942 isolated from the fjord sediment.
Appl Microbiol Biotechnol.
2014; 98(2): 603–10. PubMed Abstract
| Publisher Full Text
| Faculty Opinions Recommendation
89.
Deng P, Wang X, Baird SM, et al.:
Comparative genome-wide analysis reveals that Burkholderia contaminans MS14 possesses multiple antimicrobial biosynthesis genes but not major genetic loci required for pathogenesis.
Microbiologyopen.
2016. PubMed Abstract
| Publisher Full Text
| Faculty Opinions Recommendation
90.
Sokol PA, Darling P, Woods DE, et al.:
Role of ornibactin biosynthesis in the virulence of Burkholderia cepacia: characterization of pvdA, the gene encoding L-ornithine N5-oxygenase.
Infect Immun.
1999; 67(9): 4443–55. PubMed Abstract
| Free Full Text
93.
Pruesse E, Peplies J, Glöckner FO:
SINA: accurate high-throughput multiple sequence alignment of ribosomal RNA genes.
Bioinformatics.
2012; 28(14): 1823–9. PubMed Abstract
| Publisher Full Text
| Free Full Text
94.
Capella-Gutiérrez S, Silla-Martínez JM, Gabaldón T:
trimAl: a tool for automated alignment trimming in large-scale phylogenetic analyses.
Bioinformatics.
2009; 25(15): 1972–3. PubMed Abstract
| Publisher Full Text
| Free Full Text
96.
Tamura K, Nei M:
Estimation of the number of nucleotide substitutions in the control region of mitochondrial DNA in humans and chimpanzees.
Mol Biol Evol.
1993; 10(3): 512–26. PubMed Abstract
1
Department of Plant and Microbial Biology, University Zürich, Zurich, CH-8008, Switzerland 2
Laboratory of Microbiology, Ghent University, Ledeganckstraat 35, B-9000 Gent, Belgium
Financial support from the Swiss National Fund (Project 3100A0-104215) to Leo Eberl is gratefully acknowledged.
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Eberl L and Vandamme P. Members of the genus Burkholderia: good and bad guys [version 1; peer review: 3 approved] F1000Research 2016, 5(F1000 Faculty Rev):1007 (https://doi.org/10.12688/f1000research.8221.1)
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Venturi V. Reviewer Report For: Members of the genus Burkholderia: good and bad guys [version 1; peer review: 3 approved]. F1000Research 2016, 5(F1000 Faculty Rev):1007 (https://doi.org/10.5256/f1000research.8843.r14012)
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I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard.
Venturi V. Reviewer Report For: Members of the genus Burkholderia: good and bad guys [version 1; peer review: 3 approved]. F1000Research 2016, 5(F1000 Faculty Rev):1007 (https://doi.org/10.5256/f1000research.8843.r14012)
Leitão J. Reviewer Report For: Members of the genus Burkholderia: good and bad guys [version 1; peer review: 3 approved]. F1000Research 2016, 5(F1000 Faculty Rev):1007 (https://doi.org/10.5256/f1000research.8843.r14010)
I confirm that I have read this submission and believe that I have an
... Continue reading
Competing Interests: No competing interests were disclosed.
Faculty Reviews are commissioned and written by members of the prestigious Faculty Opinions Faculty, and are edited as a service to our readers. In order to make these reviews as comprehensive and accessible as possible, we seek the reviewers’ input before publication. The reviewers’ names and any additional comments they may have are published alongside the review, as is usual on F1000Research.
I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard.
Leitão J. Reviewer Report For: Members of the genus Burkholderia: good and bad guys [version 1; peer review: 3 approved]. F1000Research 2016, 5(F1000 Faculty Rev):1007 (https://doi.org/10.5256/f1000research.8843.r14010)
Berg G. Reviewer Report For: Members of the genus Burkholderia: good and bad guys [version 1; peer review: 3 approved]. F1000Research 2016, 5(F1000 Faculty Rev):1007 (https://doi.org/10.5256/f1000research.8843.r14009)
I confirm that I have read this submission and believe that I have an
... Continue reading
Competing Interests: No competing interests were disclosed.
Faculty Reviews are commissioned and written by members of the prestigious Faculty Opinions Faculty, and are edited as a service to our readers. In order to make these reviews as comprehensive and accessible as possible, we seek the reviewers’ input before publication. The reviewers’ names and any additional comments they may have are published alongside the review, as is usual on F1000Research.
I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard.
Berg G. Reviewer Report For: Members of the genus Burkholderia: good and bad guys [version 1; peer review: 3 approved]. F1000Research 2016, 5(F1000 Faculty Rev):1007 (https://doi.org/10.5256/f1000research.8843.r14009)
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