Ensifer numidicus | |
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Rhizobia nodules attached to roots of Vigna unguiculata | |
Scientific classification ![]() | |
Domain: | Bacteria |
Kingdom: | Pseudomonadati |
Phylum: | Pseudomonadota |
Class: | Alphaproteobacteria |
Order: | Hyphomicrobiales |
Family: | Rhizobiaceae |
Genus: | Ensifer |
Species: | E. numidicus |
Binomial name | |
Ensifer numidicus Merabet et al. 2010 | |
Type strain | |
ORS 1444, ORS1410, ORS 1407, LMG 24690,CIP 109850, PN14, LBi2 |
Ensifer numidicus is a nitrogen fixing symbiont of Fabaceae. [1] gram-negative, aerobic, non-spore forming, rod-shaped bacterium of the family Rhizobiaceae. [2] First described in 2010; [1] more biovars have since been isolated and described [3] with ORS 1407 considered the representative organism. [4] Most examples have been found in arid and infra-arid regions of Tunisia. [5]
Biovars has been shown to induce nodule formation in a wide variety of symbiosis competent plant species including Medicago Sativa(cultivated alfalfa) [6] , Lotus creticus [3] ,Syrian mesquite(Prosopis farcta), [7] Lens culinaris Medikus ssp(lentils) [3] [8] as well as Cicer arietinum (chickpea) [3] and Argyrolobium uniflorum. [1]
Argyrolobium uniflorum: ORS 1407 [1]
cultivated alfalfa (Medicago sativa) :ORS 1407 [1]
Lotus creticus: PT26 [7] , ORS 1410 [3]
Cultivated lentils(Lens culinaris): ORS 1444 [3]
Cicer arietinum (chickpea):LBi2 [3]
Syrian mesquite(Prosopis farcta):PN14 [7]
Known relationships between cultivars
This phylogeny is based on a constrained analysis of the 16S ribosomal RNA [1]
16s RNA analysis has found Ensifer numidicus to be closely related to Ensifer medicae and Ensifer garamanticus. [3] Analogous genes between closely related species suggests high levels of horizontal gene transfer between closely related species. [3] Laboratory inoculation has shown Ensifer numidicus engages in indeterminate nodulation with host plants in at least some circumstances. [9]
E. numidicus has been found to grow on yeast-mannitol medium at 28C with an upper limit of 40C. [1] Laboratory cultivated strains have found metabolism of at least 13 substrates including dulcitol, D-lyxose, 1-O-methyl a-D-glucopyranoside, 3-O-methyl-D-glucopyranose, D-gluconate, L-histidine, succinate, fumarate, ethanolamine, DL-b-hydroxybutyrate, L-aspartate, L-alanine and propionate. [1] Sensitivity has been found to salt concentrations greater than 4%. [3] Due to similarities to other Ensifer species, it cannot be described by growth conditions alone and must be differentiated by genetic components. [3]
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