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Nitrogen fixation is a chemical process by which molecular nitrogen (N
2), which has a strong triple covalent bond, is converted into ammonia (NH
3) or related nitrogenous compounds, typically in soil or aquatic systems but also in industry. The nitrogen in air is molecular dinitrogen, a relatively nonreactive molecule that is metabolically useless to all but a few microorganisms. Biological nitrogen fixation or diazotrophy is an important microbe-mediated process that converts dinitrogen (N2) gas to ammonia (NH3) using the nitrogenase protein complex (Nif).
The Fabaceae or Leguminosae, commonly known as the legume, pea, or bean family, are a large and agriculturally important family of flowering plants. It includes trees, shrubs, and perennial or annual herbaceous plants, which are easily recognized by their fruit (legume) and their compound, stipulate leaves. The family is widely distributed, and is the third-largest land plant family in number of species, behind only the Orchidaceae and Asteraceae, with about 765 genera and nearly 20,000 known species.
Dryas is a genus of perennial cushion-forming evergreen dwarf shrubs in the family Rosaceae, native to the arctic and alpine regions of Europe, Asia and North America. The genus is named after the dryads, the tree nymphs of ancient Greek mythology. The classification of Dryas within the Rosaceae has been unclear. The genus was formerly placed in the subfamily Rosoideae, but is now placed in subfamily Dryadoideae.
Diazotrophs are bacteria and archaea that fix gaseous nitrogen in the atmosphere into a more usable form such as ammonia.
Root nodules are found on the roots of plants, primarily legumes, that form a symbiosis with nitrogen-fixing bacteria. Under nitrogen-limiting conditions, capable plants form a symbiotic relationship with a host-specific strain of bacteria known as rhizobia. This process has evolved multiple times within the legumes, as well as in other species found within the Rosid clade. Legume crops include beans, peas, and soybeans.
Symbiotic bacteria are bacteria living in symbiosis with another organism or each other. For example, rhizobia living in root nodules of legumes provide nitrogen fixing activity for these plants.
Paraburkholderia phymatum is a species of bacteria that is capable of symbiotic nitrogen fixation with the legumes Machaerium lunatum and Mimosa pudica. Recently, the genome was sequenced. It consists of two chromosomes, a megaplasmid, and a plasmid hosting the symbiotic functions.
Paraburkholderia phytofirmans is a species of bacteria. They have been reported to colonize endophytic tissues of hybrid spruce and lodgepole pine with a strong potential to perform biological nitrogen fixation and plant growth promotion.
Paraburkholderia tuberum is a species of bacteria that is capable of symbiotic nitrogen fixation with the legume Aspalathus carnosa.
Actinorhizal plants are a group of angiosperms characterized by their ability to form a symbiosis with the nitrogen fixing actinomycetota Frankia. This association leads to the formation of nitrogen-fixing root nodules.
Cyanobionts are cyanobacteria that live in symbiosis with a wide range of organisms such as terrestrial or aquatic plants; as well as, algal and fungal species. They can reside within extracellular or intracellular structures of the host. In order for a cyanobacterium to successfully form a symbiotic relationship, it must be able to exchange signals with the host, overcome defense mounted by the host, be capable of hormogonia formation, chemotaxis, heterocyst formation, as well as possess adequate resilience to reside in host tissue which may present extreme conditions, such as low oxygen levels, and/or acidic mucilage. The most well-known plant-associated cyanobionts belong to the genus Nostoc. With the ability to differentiate into several cell types that have various functions, members of the genus Nostoc have the morphological plasticity, flexibility and adaptability to adjust to a wide range of environmental conditions, contributing to its high capacity to form symbiotic relationships with other organisms. Several cyanobionts involved with fungi and marine organisms also belong to the genera Richelia, Calothrix, Synechocystis, Aphanocapsa and Anabaena, as well as the species Oscillatoria spongeliae. Although there are many documented symbioses between cyanobacteria and marine organisms, little is known about the nature of many of these symbioses. The possibility of discovering more novel symbiotic relationships is apparent from preliminary microscopic observations.
Trophic mutualism is a key type of ecological mutualism. Specifically, "trophic mutualism" refers to the transfer of energy and nutrients between two species. This is also sometimes known as resource-to-resource mutualism. Trophic mutualism often occurs between an autotroph and a heterotroph. Although there are many examples of trophic mutualisms, the heterotroph is generally a fungus or bacteria. This mutualism can be both obligate and opportunistic.
Paraburkholderia diazotrophica is a gram-negative, catalase and oxidase-positive, aerobic, non-spore-forming, motile bacterium from the genus Paraburkholderia and the family Burkholderiaceae which was isolated from the nitrogen-fixing nodules on the roots of a Mimosa. Colonies of Paraburkholderia diazotrophica are yellow pigmented.
Paraburkholderia mimosarum is a gram-negative, catalase and oxidase-positive non-spore-forming, rod-shaped bacterium from the genus Paraburkholderia and the family Burkholderiaceae. P. mimosarum is able to nodulate tropical plant species, mainly from the genus Mimosa.
Paraburkholderia nodosa is a gram-negative, catalase and oxidase-positive, non-spore-forming, bacterium from the genus Paraburkholderia and the family Burkholderiaceae which was isolated from nitrogen-fixing nodules from roots of Mimosa bimucronata and Mimosa scabrella.
Paraburkholderia sabiae is a Gram-negative, catalase- and oxidase-positive non-spore-forming bacterium of the genus Paraburkholderia and the family Burkholderiaceae, which was isolated from the nitrogen-fixing nodules on the roots of Mimosa caesalpiniaefolia in Brazil.
Paraburkholderia sprentiae is a Gram-negative, rod-shaped bacterium from the genus Paraburkholderia and the family Burkholderiaceae which was isolated from root nodules from the plant Lebeckia ambigua in South Africa.
Giles Edward Dixon Oldroyd is a professor at the University of Cambridge, working on beneficial Legume symbioses in Medicago truncatula. He has been a Royal Society Wolfson Research Merit Award winner and the Society of Biology (SEB) President's Medal winner. From 2014 Giles has been in the top 1% of highly cited plant scientists across the world.
Paraburkholderia is a genus of Pseudomonadota that are gram negative, slightly curved rods that are motile by means of flagella. They have been reported to colonize endophytic tissues of hybrid spruce and lodgepole pine with a strong potential to perform biological nitrogen fixation and plant growth promotion. Unlike Burkholderia species, Paraburkholderia members are not commonly associated with human infection. Paraburkholderia members form a monophyletic clade within the Burkholderiaceae family, which is what prompted their distinction as a genus independent from Burkholderia species, in combination with the finding of robust conserved signature indels which are unique to Paraburkholderia species, and are lacking in members of the genus Burkholderia. These CSIs distinguish the genus from all other bacteria. Additionally, the CSIs that were found to be shared by Burkholderia species are absent in Paraburkholderia, providing evidence of separate lineages.
Esperanza Martínez-Romero is a researcher and head of the Genomic Ecology Program at the Center for Genomic Sciences (CCG) of the National Autonomous University of Mexico (UNAM) in Cuernavaca, Mexico. She was awarded the L'Oréal-UNESCO For Women in Science Award in 2020.
References
- 1 2 3 "Professor Janet Sprent OBE, FRSE". Dundee University. Retrieved 1 May 2015.
- 1 2 3 "Profile: Janet I. Sprent", New Phytologist, vol. 215, pp. 38–39, 2017, doi: 10.1111/nph.14618
- ↑ "Professor Janet Sprent", The Royal Society of Edinburgh, retrieved 21 February 2023
- ↑ De Meyer, Sofie E.; Cnockaert, Margo; Ardley, Julie K.; Maker, Garth; Yates, Ron; Howieson, John G.; Vandamme, Peter (2013), "Burkholderia sprentiae sp. nov., isolated from Lebeckia ambigua root nodules", International Journal of Systematic and Evolutionary Microbiology, 63 (11): 3950–3957, doi:10.1099/ijs.0.048777-0
- ↑ Sawana, Amandeep; Adeolu, Mabolaji; Gupta, Radhey (2014). "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". Frontiers in Genetics. 5. 429. doi: 10.3389/fgene.2014.00429 . PMC 4271702 . PMID 25566316.
- ↑ Robins, Rhiannon (5 March 2021), "Sprent Reviews", British Ecological Society, retrieved 21 February 2023
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