Burkholderia gladioli

Burkholderia gladioli is a species of aerobic gram-negative rod-shaped bacteria[1] that causes disease in both humans and plants. It can also live in symbiosis with plants and fungi[2] and is found in soil, water, the rhizosphere, and in many animals. It was formerly known as Pseudomonas marginata.

Burkholderia gladioli
Scientific classification
Kingdom:
Bacteria
Phylum:
Proteobacteria
Class:
Beta Proteobacteria
Order:
Burkholderiales
Family:
Burkholderiaceae
Genus:
Burkholderia
Species:
B. gladioli
Binomial name
Burkholderia gladioli
(Zopf 1885)
Yabuuchi et al. 1993
Type strain
ATCC 10248
CCUG 1782
CFBP 2427
CIP 105410
DSM 4285
HAMBI 2157
ICMP 3950
JCM 9311
LMG 2216
NBRC 13700
NCCB 38018
NCPPB 1891
NCTC 12378
NRRL B-793
Synonyms

Pseudomonas gladioli Severini 1913
Burkholderia cocovenenans (van Damme et al. 1960) Gillis et al..
Pseudomonas cocovenenans van Damme et al. 1960
Pseudomonas antimicrobica Attafuah and Bradbury 1990
Pseudomonas marginata (McCulloch) Stapp
Pseudomonas farinofermentans Naixin
Pseudomonas alliicola (Burkholder 1942) Starr and Burkholder 1942

B. gladioli synthesizes several inhibitory substances, among them gladiolin, bongkrek acid, enaxyloxin, and toxoflavin.[3][4][5][6] Those molecules might participate in antagonistic interactions with other microbes in the environment where they grow.[7] One pathovariety, growing on coconut pulp, produces the respiratory toxin bongkrek acid which can cause fatal poisoning in humans.

Nomenclature

The members of the genus Burkholderia were formerly classified as Pseudomonas, but Burkholderia was one of the seven genera that arose when Pseudomonas was divided based on rRNA differences.[8] Burkholderia gladioli is closely related to, and often mistaken for, a member of the Burkholderia cepacia complex. This includes ten closely related species, which are all plant pathogens.

Burkholderia gladioli is divided into three pathovars: gladioli, allicola, and agaricicola. B. gladioli pv. gladioli causes gladiolus rot, allicola causes onion bulb rot, and agaricicola causes soft rot in mushrooms [9]

Identification

Burkholderia are motile, Gram negative rods that may be straight or slightly curved. They are aerobic, catalase positive, urease positive, nonsporeformers. They grow on MacConkey agar, but do not ferment the lactose. Burkholderia gladioli can be distinguished from the other Burkholderia because it is oxidase negative [1] B. gladioli is indole negative, nitrate negative, and lysine decarboxylation negative.[10]

On the molecular level, PCR can be used to distinguish between the different Burkholderia species. According to Furuya et al., the ribosomal RNA gene is highly conserved and universally distributed in all living things, and therefore difference in the DNA sequences between 16S and 23S rRNA genes can be used to differentiate between the species.[11]

The primers used for the amplification of the 16S to 23S region in the B. gladioli genome are as follows: GLA-f 5'-(CGAGCTAATACCGCGAAA)-3' and GLA-r 5'-(AGACTCGAGTCAACTGA)-3' Using these primers for PCR results in an amplicon of approximately 300bp.[11]

All members of the genus Burkholderia have multireplicon genomes. They are able to keep "essential housekeeping" genes on the largest chromosome. This largest chromosome has a single origin of replication. The gene order and GC composition is conserved as well. Members of Burkholderia are able to capture and retain foreign DNA. The foreign DNA can be detected by looking for atypical GC context areas. One of the first foreign DNA segments detected this way encoded for virulence.[1]

Pathology

In plants
Gladiolus plant inoculated with B. gladioli

Burkholderia gladioli has been identified as a plant pathogen in onions, gladiolus, iris, and together with Burkholderia glumae affect the rice. It was originally described to have caused rot of gladiolus corms. The bulbs can become water soaked and decay.

Some other common symptoms of infected plants can be seen in the leaves. The leaves contain brown lesions, and they may become watersoaked. Other symptoms are the wilting and/or rot of roots, stems, and petals. B. gladioli has also been identified as the causative agent in leaf-sheath browning in gladiolas and onions. Sometimes, the whole plant decays.[2]

One widespread plant disease caused by Burkholderia gladioli is called scab. It can be seen on Gladiolus corms as water-soaked brown spots, outlined in yellow. Eventually, they can become hollow and surrounded by scabs. If the scabs fall off, they leave behind cavities or lesions.[12]

In humans

Burkholderia gladioli in humans is an opportunistic pathogen that is an important agent for hospital-associated infections. It has recently appeared as a severe pathogen in patients with cystic fibrosis, causing severe pulmonary infections.[2] Though it is still a fairly uncommon pathogen, its presence is associated with a poor prognosis. It has also colonized the respiratory tracts of patients with granulomatous disease. In lung transplant patients, infection can be fatal as patients have developed bacteremia and sterile wound infections as a result.[13]

Tempe bongkrèk, a variation of tempeh prepared with coconut, is susceptible to B. gladioli pathovar. cocovenenans contamination. Contaminated tempe bongkrèk can contain lethal amounts of highly toxic bongkrek acid and toxoflavin.

B. gladioli was implicated in the 2015 deaths of 75 people, in Mozambique, who had consumed a home-brewed beer made from corn flour that was contaminated with the bacterium.[14]

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References
  1. Coenye, Tom; Vandamme, Peter (2007). Burkholderia: Molecular Microbiology and Genomics. Horizon Bioscience. ISBN 978-1-904933-28-1.
  2. Stoyanova M, Pavlina I, Moncheva P, Bogatzevska N (March 2007). "Biodiversity and Incidence of Burkholderia Species". Biotechnol. & Biotechnol. Eq. 21 (3): 306–310. doi:10.1080/13102818.2007.10817465.
  3. Song, L.J.; Jenner, M.; Masschelein, J.; Jones, C.; Bull, M.J.; Harris, S.R; Hartkoorn, R.C.; Vocat, A.; Romero-Canelon, I.; Coupland, P.; Webster, G.; Dunn, M.; Weiser, R.; Paisey, C.; Cole, S.T.; Parkhill, J.; Mahenthiralingam, E.; Challis, G.L. (2017). "Discovery and biosynthesis of gladiolin: A Burkholderia gladioli antibiotic with promising activity against Mycobacterium tuberculosis". Journal of the American Chemical Society. 139 (23): 7974–7081. doi:10.1021/jacs.7b03382. ISSN 1520-5126. PMID 28528545.
  4. Subik, J.; Behun, J. (2017). "Effect of bongkrekic acid on growth and metabolism of filamentous fungi". Archives of Microbiology. 97 (1): 81–88. doi:10.1007/BF00403048.
  5. Ross, C.; Opel, V.; Scherlach, K.; Herweck, C. (2014). "Biosynthesis of antifungal and antibacterial polyketides by Burkholderia gladioli in coculture with Rhizopus microspores". Mycoses. 3: 44–55. doi:10.1111/myc.12246. PMID 25250879.
  6. Furuya, N.; Iiyama, K.; Shiozaki, N.; Matsuyama, N. (1997). "Phytotoxin produced by Burkholderia gladioli". Journal of the Faculty of Agriculture, Kyushu University. 42: 33–37.
  7. Marín-Cevada, V.; Muñoz-Rojas, J.; Caballero-Mellado, J.; Mascarúa-Esparza, M.A.; Castañeda-Lucio, M.; Carreño-López, R.; Estrada-de los Santos, P.; Fuentes-Ramírez, L.E. (2012). "Antagonistic interactions among bacteria inhabiting pineapple". Applied Soil Ecology. 61: 230–235. doi:10.1016/j.apsoil.2011.11.014.
  8. Prescott, L. M.; Harley, J. P.; Klein, D. A. (2005). "Bacteria: The Proteobacteria". Microbiology (6th ed.). New York: McGraw-Hill. pp. 482–483. ISBN 978-0-07-295175-2.
  9. Jiao Z, Kawamura Y, Mishima N, Yang R, Li N, Liu X, Ezaki T (2003). "Need to Differentiate Lethal Toxin-Producing Strains of Burkholderia gladioli, Which Cause Seere Food Poisoning: Description of B. gladioli Pathovar cocovenenans and an Emended Description of B. gladioli". Microbiol. Immunol. 47 (12): 915–925. doi:10.1111/j.1348-0421.2003.tb03465.x.
  10. Graves M, Robin T, Chipman AM, Wong J, Khashe S, Janda JM (October 1997). "Four Additional Cases of Burkholderia gladioli Infection with Microbiological Correlates and Review". CID. 25 (4): 838–842. doi:10.1086/515551. PMID 9356798.
  11. Furuya N, Ura H, Iiyama K, Matsumoto M, Takeshita M, Takanami Y (2002). "Specific Oligonucleotide Primers Based on Sequences of the 16S-23S rDNA Spacer Region for the Detection of Burkholderia gladioli by PCR". J. Gen. Plant Pathol. 68 (3): 220–224. doi:10.1007/PL00013080.
  12. "Page has moved, College of ACES :: University of Illinois" (PDF). Archived from the original (PDF) on 2006-09-01. Retrieved 2008-04-19.
  13. Khan, Saeed U.; Arroliga, Alejandro C.; Gordon, Steven M. (1998). "Significance of Airway Colonization by Burkholderia gladioli in Lung Transplant Candidates". Chest. 114 (2): 658. doi:10.1378/chest.114.2.658. PMID 9726771.
  14. "Mozambique: Mass Poisoning Caused By Bacterial Contamination". allafrica.com. 4 November 2015. Retrieved 7 February 2016.
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