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Trevoa
''Trevoa'' is a genus of actinorhizal plants; these dicotyledon flora are trees or small shrubs. The genus was first proposed by Miers in 1825, but was not fully described until 1830 by Sir William Jackson Hooker. Genus members are notable for their ability to fix nitrogen. Species of this genus are generally found in the near coastal forests and arid shrubland of South America. Some species are localized in the mountains of central Chile; for example, the species ''Trevoa trinervis'' occurs in the La Campana National Park and other proximate areas of central Chile. Along with some related plants in the family Rhamnaceae, they fix nitrogen via root nodules which contain ''Frankia'' bacteria. Other nitrogen-fixing genera in this family include ''Ceanothus'', ''Colletia'', ''Discaria'', '' Kentrothamnus'', and '' Retanilla''. Taxonomy The botanist Karl Friedrich Reiche Karl Friedrich Reiche ( es, Carlos Reiche, October 31, 1860 – February 26, 1929) was a German botanist wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Retanilla Trinervia
''Retanilla trinervia'' is a species of actinorhizal plant within the family Rhamnaceae; this dicotyledon flora is a shrub or small tree. ''R. trinervia'' is notable for its ability to fix nitrogen. This species mainly occurs in the near coastal forests and arid shrubland of Chile. Example occurrences are found in the mountains of central Chile; for example, it occurs in the La Campana National Park in association with ''Acacia caven'' and '' Jubaea chilensis''.C. Michael Hogan. 2008''Chilean Wine Palm: Jubaea chilensis'', GlobalTwitcher.com, ed. N. Stromberg. as well as other proximate areas of central Chile. See also * Cerro La Campana Cerro la Campana, the Bell mountain, is a mountain in La Campana National Park in central Chile. The Pacific and the mountain Aconcagua are visible from the summit on clear days. Due to the area's expanding human population, considerable def ... References Rhamnaceae {{Rhamnaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trevoa Trinervis
''Retanilla trinervia'' is a species of actinorhizal plant within the family Rhamnaceae; this dicotyledon flora is a shrub or small tree. ''R. trinervia'' is notable for its ability to fix nitrogen. This species mainly occurs in the near coastal forests and arid shrubland of Chile. Example occurrences are found in the mountains of central Chile; for example, it occurs in the La Campana National Park in association with ''Acacia caven'' and ''Jubaea chilensis''.C. Michael Hogan. 2008''Chilean Wine Palm: Jubaea chilensis'', GlobalTwitcher.com, ed. N. Stromberg. as well as other proximate areas of central Chile. See also * Cerro La Campana Cerro la Campana, the Bell mountain, is a mountain in La Campana National Park in central Chile. The Pacific and the mountain Aconcagua are visible from the summit on clear days. Due to the area's expanding human population, considerable def ... References Rhamnaceae {{Rhamnaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhamnaceae
The Rhamnaceae are a large family of flowering plants, mostly trees, shrubs, and some vines, commonly called the buckthorn family. Rhamnaceae is included in the order Rosales. The family contains about 55 genera and 950 species. The Rhamnaceae have a worldwide distribution, but are more common in the subtropical and tropical regions. The earliest fossil evidence of Rhamnaceae is from the Late Cretaceous. Fossil flowers have been collected from the Upper Cretaceous of Mexico and the Paleocene of Argentina. Leaves of family Rhamnaceae members are simple, i.e., the leaf blades are not divided into smaller leaflets.Flowering Plants of the Santa Monica Mountains, Nancy Dale, 2nd Ed. 2000, p. 166 Leaves can be either alternate or opposite. Stipules are present. These leaves are modified into spines in many genera, in some (e.g. ''Paliurus spina-christi'' and '' Colletia cruciata'') spectacularly so. ''Colletia'' stands out by having two axillary buds instead of one, one developing int ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kentrothamnus
''Kentrothamnus'' is a monotypic genus of flowering plants in the family Rhamnaceae, native to Bolivia and Argentina. The only species is ''Kentrothamnus weddellianus''. It is an actinorhizal plant 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. Classification Actinorh .... References Rhamnaceae genera Rhamnaceae Monotypic Rosales genera {{Rhamnaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nitrogen Fixation
Nitrogen fixation is a chemical process by which molecular nitrogen (), with a strong triple covalent bond, in the air is converted into ammonia () or related nitrogenous compounds, typically in soil or aquatic systems but also in industry. Atmospheric nitrogen 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 microbials mediated process that converts dinitrogen (N2) gas to ammonia (NH3) using the nitrogenase protein complex (Nif). Nitrogen fixation is essential to life because fixed inorganic nitrogen compounds are required for the biosynthesis of all nitrogen-containing organic compounds, such as amino acids and proteins, nucleoside triphosphates and nucleic acids. As part of the nitrogen cycle, it is essential for agriculture and the manufacture of fertilizer. It is also, indirectly, relevant to the manufacture of all nitrogen chemical c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Root Nodule
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. Within legume root nodules, nitrogen gas (N2) from the atmosphere is converted into ammonia (NH3), which is then assimilated into amino acids (the building blocks of proteins), nucleotides (the building blocks of DNA and RNA as well as the important energy molecule ATP), and other cellular constituents such as vitamins, flavones, and hormones. Their ability to fix gaseous nitrogen makes legumes an ideal agricultural organism as their requirement for nitrogen fertilizer is reduced. Indeed, high nitrogen content blocks nodule development as there is no benefit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frankia
''Frankia'' is a genus of nitrogen-fixing bacteria that live in symbiosis with actinorhizal plants, similar to the ''Rhizobium'' bacteria found in the root nodules of legumes in the family Fabaceae. ''Frankia'' also initiate the forming of root nodules. This genus was originally named by Jørgen Brunchorst, in 1886 to honor the German biologist Albert Bernhard Frank. Brunchorst considered the organism he had identified to be a filamentous fungus. redefined the genus in 1970 as containing prokaryotic actinomycetes and created the family Frankiaceae within the Actinomycetales. He retained the original name of ''Frankia'' for the genus. Overview Most ''Frankia'' strains are specific to different plant species. The bacteria are filamentous and convert atmospheric nitrogen into ammonia via the enzyme nitrogenase, a process known as nitrogen fixation. They do this while living in root nodules on actinorhizal plants. The bacteria can supply most or all of the nitrogen requirement ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Actinorhizal
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. Classification Actinorhizal plants are dicotyledons distributed among three angiosperm orders, 8 families and 25 genera: These three orders form a single clade within the Rosids, which is a sister taxon to the other major nitrogen-fixing order, the Fabales. All actinorhizal species are trees or shrubs, except for the genus ''Datisca''. Many are common plants in temperate regions like alder, bayberry, sweetfern, Avens, mountain misery and ''Coriaria''. Some ''Elaeagnus'' species and Sea-buckthorns produce edible fruit. In tropical regions, ''Casuarinas'' are widely cultivated. Distribution and ecology Actinorhizal plants are found on all continents except for Antarctica. Their ability to form nitrogen-fixing nodules confers a selective advantage in poor soil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
