The genus Massilia is an outdated genus name of bacteria within the family Oxalobacteriaceae. All Massilia species were reclassified in 2023 into one of the following genera: Duganella, Pseudoduganella, Janthinobacterium, Telluria, Rugamonas, Mokoshia, or Zemynaea. [2]
They may contain either peritrichous or polar flagella. [3] [4] [5] This genus was first described in 1998, after the type species, Massilia timonae , was isolated from the blood of an immunocompromised patient. [5] The genus was named after the old Greek and Roman name for the city of Marseille, France, where the organism was first isolated. [5] However, 16S rRNA-based phylogenetic trees in 2023 determined that many Massilia species actually belong within the Telluria genus, which was validly published first, having nomenclatural priority.
Massilia are a diverse group that reside in many different environments, have many heterotrophic means of gathering energy, and are commonly found in association with plants.
Isolation of Massilia sp. commonly occurs on Reasoner's 2A (R2A) agar. [4] [6] Colonies are often shades of white, yellow, or orange, [7] [4] but may be blue-purple if producing the compound violacein. [6]
Members of the genus Massilia have been re-classified into other genera as of 2023 using 16S rRNA-based phylogenetic trees. Originally, the Massilia genus existed within a polyphyletic group of the Oxalobacteriaceae, alongside other genera including Duganella, Pseudoduganella, Janthinobacterium, Telluria, and Rugamonas. [7] In 2023, it was discovered that the type species of the genus, Telluria mixta, had nomenclatural priority over the name "Massilia", having been validly published first. [2] Thus, all isolated Massilia species have been reclassified into the following genera: Duganella, Pseudoduganella, Janthinobacterium, Telluria, Rugamonas, or the novel genera Mokoshia and Zemynaea. [2]
Massilia sp. are environmental organisms that are commonly associated with plants. They have been isolated from the soil, [3] flowers, [7] seeds, [8] and roots of many species of plants. [4] They are generally psychrophilic or mesophilic, preferring cool to moderate temperatures, [6] and they are generally either strict aerobes or microaerophiles. [7] [6] Massilia are proficient at surface colonization, including the seed coat, emerging radicles, roots, and even the hyphae of Pythium. [9]
Massilia have been isolated from other, sometimes extreme, environments as well, including the Sahara Desert, [10] freshwater, [6] glaciers, rocks, and air samples. [6] Manganese-oxidizing Massilia have been isolated. [11] In rare cases, some Massilia sp. have caused infections in humans. [12] However, doctors presume that these infections were likely opportunistic, as Massilia sp. are generally considered environmental organisms, rather than animal-associated. [12]
Some Massilia sp. are able to degrade cellulose [13] or chitin, [14] two naturally occurring carbohydrate polymers, using cellulase and endochitinase enzymes, respectively. Many Massilia produce extracellular proteases, which can degrade proteins, producing carbon and nitrogen for the organism to consume, [15] Massilia have also been reported to hydrolyse gelatin, casein, starch, DNA, tyrosine, and more. [16] Massilia may play a crucial role in carbon cycling due to their broad range of degradative enzymes, [6]
Massilia also have the potential to degrade many pollutants present in the environment. Massilia sp. WF1 was able to degrade the polycyclic aromatic hydrocarbon phenanthrene, each when alone and when in co-culture with the fungal species Phanerochaete chrysosporium. [17]
Some Massilia sp. are capable of phosphorus solubilization in the soil. [15] Phosphorus solubilization allows plants to take in more phosphorus, potentially promoting plant growth. Analysis of Massilia genomes has identified genes for producing auxins, plant hormones, which can promote or alter plant growth. [16] [18] [19] Their hydrolysis of extracellular compounds, such as proteins or DNA, can also release nutrients for the plant or other bacteria to utilize.
Antibiotic production is found in a few Massilia isolates, though many of these antibiotic compounds have not been identified. Massilia rhizosphaerae has antibacterial activity against the plant pathogen Ralstonia solanacearum. [4] Massilia antibiotica has antibacterial activity against the pathogens Escherichia coli and Pseudomonas aeruginosa. [16]
Some Massilia sp. are known to produce violacein, a pigment also prouduced by Chromobacterium violaceum. [20] [6] This produces blue-purple pigmented colonies. Violacein production is regulated by quorum-sensing. [21] a mechanism by which bacteria alter their gene expression in response to the population density.
Listeria is a genus of bacteria that acts as an intracellular parasite in mammals. Until 1992, 10 species were known, each containing two subspecies. By 2024, 28 species had been identified. The genus is named in honour of the British pioneer of sterile surgery Joseph Lister. Listeria species are Gram-positive, rod-shaped, and facultatively anaerobic, and do not produce endospores. The major human pathogen in the genus Listeria is L. monocytogenes. It is usually the causative agent of the relatively rare bacterial disease listeriosis, an infection caused by eating food contaminated with the bacteria. Listeriosis can cause serious illness in pregnant women, newborns, adults with weakened immune systems and the elderly, and may cause gastroenteritis in others who have been severely infected.
Campylobacterota are a phylum of Gram-negative bacteria. Only a few genera have been characterized, including the curved to spirilloid Wolinella, Helicobacter, and Campylobacter. Until the 2021 revision of bacterial taxonomy by the ICSP, the entire phylum was classified within the Proteobacteria as the Epsilonproteobacteria.
Delftia is a genus of Gram-negative bacteria that was first isolated from soil in Delft, Netherlands. The species is named after both the city, and in honor of pioneering research in the field of bacteriology that occurred in Delft. Cells in the genus Delftia are rod shaped and straight or slightly curved. Cells occur singly or in pairs, are 0.4–0.8ɥM wide and 2.5–4.1 μm long. Delftia species are motile by flagella, nonsporulating, and chemo-organotrophic.
Duganella is a genus of bacteria in the Oxalobacteraceae family.
Collimonas is a genus of bacteria in the family Oxalobacteraceae. Culturable representatives of this genus have the ability to lyse chitin, to use fungal hyphae as a source of food, to produce antifungal molecules and to be effective at weathering.
Desulfosporosinus is a genus of strictly anaerobic, sulfate-reducing bacteria, often found in soil.
Chitinimonas is a genus of Gram-negative, chitinolytic, rod-shaped bacteria which have flagella from the family of Burkholderiaceae which belongs to the class Betaproteobacteria. All species of Chitinimonas have been found in regions of Asia. Species of this genus are found to be both aerobic and anaerobic. Chitinimonas is optimally grown and cultured at 25 °C to 37 °C, with very little concentrations of NaCl.
Paeniglutamicibacter cryotolerans is a species of bacteria. It is psychrotolerant, halotolerant, Gram-positive, motile, and facultatively anaerobic. It possesses a rod–coccus cycle.
Azospirillum is a Gram-negative, microaerophilic, non-fermentative and nitrogen-fixing bacterial genus from the family of Rhodospirillaceae. Azospirillum bacteria can promote plant growth.
Verticia is a genus of flies (Diptera) in the family Calliphoridae. The genus was first described by J.R. Malloch in 1927.
Olivibacter is a genus from the family of Sphingobacteriaceae.
Arcicella is a genus of aerobic bacteria from the family of Spirosomaceae.
Violacein is a naturally-occurring bis-indole pigment with antibiotic properties. Violacein is produced by several species of bacteria, including Chromobacterium violaceum, and gives these organisms their striking purple hues. Violacein shows increasing commercially interesting uses, especially for industrial applications in cosmetics, medicines and fabrics.
Mangrovibacter is a genus in the order Enterobacterales. Members of the genus are Gram-stain-negative, facultatively anaerobic, nitrogen-fixing, and rod shaped. The name Mangrovibacter derives from:
Neo-Latin noun mangrovum, mangrove; Neo-Latin masculine gender noun, a rod; bacter, nominally meaning "a rod", but in effect meaning a bacterium, rod; Neo-Latin masculine gender noun Mangrovibacter, mangrove rod.
Endozoicomonas is a genus of Gram-negative, aerobic or facultatively anaerobic, chemoorganotrophic, rod-shaped, marine bacteria from the family of Endozoicomonadaceae. Endozoicomonas are symbionts of marine animals.
Aestuariicella is a rod-shaped, Gram-negative, and strictly aerobic genus of bacteria from the order Alteromonadales with one known species. Aestuariicella hydrocarbonica was first isolated in 2015 from oil spill contaminated tidal flat sediments from the Dangjin bay in Korea. Due to the recent nature of its discovery, its taxonomic classification has not yet been accepted. Future research into its evolutionary history and genome may change the naming of this organism.
Cytophagales is an order of non-spore forming, rod-shaped, Gram-negative bacteria that move through a gliding or flexing motion. These chemoorganotrophs are important remineralizers of organic materials into micronutrients. They are widely dispersed in the environment, found in ecosystems including soil, freshwater, seawater and sea ice. Cytophagales is included in the Bacteroidota phylum.
Lederbergia is a genus of gram-positive or Gram-variable, rod-shaped bacteria in the family Bacillaceae within the order Bacillales. The type species for this genus is Lederbergia galactosidilyticus.
Margalitia is a genus of gram-positive or gram-variable rod-shaped bacteria in the family Bacillaceae from the order Bacillales. The type species of this genus is Margalitia shackletonii.
Paraburkholderia elongata is a Gram-negative bacterium belonging to the genus Paraburkholderia. The type strain is P. elongata 5NT, which was isolated from the Arnot research forest, near Van Etten, New York, using agar medium supplemented with soil-extracted, solubilized organic matter. The same isolation effort and methodology led to the isolation of P. solitsugae 1NT. P. elongata was named after its tendency to form elongated, filamentous cells when grown in concentrated growth media. Phosphate concentration was found to regulate the conditional filamentation of P. elongata, resulting from the accumulation of intracellular polyphosphate.
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