Samiksha Jaiswal (Editor)


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Kingdom  Bacteria
Order  Actinomycetales
Family  Frankiaceae
Higher classification  Frankiaceae
Phylum  Actinobacteria
Suborder  Frankineae
Scientific name  Frankia
Rank  Genus
Frankia Untitled Document
Similar  Bacteria, High GC gram+, Casuarina, Casuarina glauca, Rhizobium

Frankia is a genus of nitrogen-fixing, filamentous bacteria that live in symbiosis with actinorhizal plants, similar to the Rhizobia bacteria found in the root nodules of legumes in the Fabaceae family. Bacteria of this genus also form root nodules.


Frankia Frankia and California native plants

This genus was originally named by Jørgen Brunchorst in 1886 to honor the German biologist, A. B. Frank. Brunchorst considered the organism he had identified to be a filamentous fungus. Becking 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.

Frankia webuconnedumcbstaffbensonFrankiaCcI3Phasejpg


Frankia Frankia sp Enfo

Frankia alni is the only named species in this genus, but a great many 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 requirements of the host plant. As a result, actinorhizal plants colonise and often thrive in soils that are low in plant nutrients.

Frankia Frankia and California native plants

Several Frankia genomes are now available which may help clarify how the symbiosis between prokaryote and plant evolved, how the environmental and geographical adaptations occurred, the metabolic diversity, and the horizontal gene flow among the symbiotic prokaryotes.

Symbiont plants

Frankia FileFrankia alni 20131230jpg Wikimedia Commons
  • All species in the genus Alnus in the Betulaceae family
  • Some species in all four genera in the Casuarinaceae family
  • Certain species in the genus Coriaria in the Coriariaceae family
  • Datisca cannabina and Datisca glomerata in the Datiscaceae family
  • All species in the three genera in the Elaeagnaceae family, Elaeagnus, Shepherdia, and Hippophae
  • All species in the genera Myrica, Morella, and Comptonia in the family Myricaceae.
  • All species in six genera in the Rhamnaceae family, Ceanothus, Colletia, Discaria, Kentrothamnus, Retanilla, and Trevoa, and possibly Adolphia
  • Some species in the Rosaceae family including all the species in the genera Cercocarpus, Cowania, Purshia, Chamaebatia, and some species of Dryas

  • Frankia Frankia MicrobeWiki


    Frankia Wikipedia