Biology of Rivellia melliginis (Diptera: Platystomatidae), a Consumer of the Nitrogen-Fixing Root Nodules of Black Locust (Leguminosae)

1990 ◽  
Vol 83 (5) ◽  
pp. 967-974 ◽  
Author(s):  
B. A. Mcmichael ◽  
B. A. Foote ◽  
B. D. Bowker
Keyword(s):  
Black Locust ◽  
Root Nodules ◽  
Nitrogen Fixing

scholarly journals Development of the nitrogen-fixing and protein-synthesizing apparatus of bacteroids in pea root nodules

1979 ◽  
Vol 562 (3) ◽  
pp. 515-526 ◽  
Author(s):  
T. Bisseling ◽  
R.C. Van Den Bos ◽  
M.W. Weststrate ◽  
M.J.J. Hakkaart ◽  
A. Van Kammen
Keyword(s):  
Root Nodules ◽  
Nitrogen Fixing ◽  
Pea Root

scholarly journals A New Species of Devosia That Forms a Unique Nitrogen-Fixing Root-Nodule Symbiosis with the Aquatic Legume Neptunia natans (L.f.) Druce

2002 ◽  
Vol 68 (11) ◽  
pp. 5217-5222 ◽  
Author(s):  
Raul Rivas ◽  
Encarna Velázquez ◽  
Anne Willems ◽  
Nieves Vizcaíno ◽  
Nanjappa S. Subba-Rao ◽  
...  
Keyword(s):  
Root Nodule ◽  
Root Nodules ◽  
Infection Process ◽  
Nitrogen Fixing ◽  
Rhizobium Tropici ◽  
Rdna Sequences ◽  
Root Nodule Symbiosis ◽  
16S Rdna Sequences ◽  
The Common ◽  
Nodule Symbiosis

ABSTRACT Rhizobia are the common bacterial symbionts that form nitrogen-fixing root nodules in legumes. However, recently other bacteria have been shown to nodulate and fix nitrogen symbiotically with these plants. Neptunia natans is an aquatic legume indigenous to tropical and subtropical regions and in African soils is nodulated by Allorhizobium undicola. This legume develops an unusual root-nodule symbiosis on floating stems in aquatic environments through a unique infection process. Here, we analyzed the low-molecular-weight RNA and 16S ribosomal DNA (rDNA) sequence of the same fast-growing isolates from India that were previously used to define the developmental morphology of the unique infection process in this symbiosis with N. natans and found that they are phylogenetically located in the genus Devosia, not Allorhizobium or Rhizobium. The 16S rDNA sequences of these two Neptunia-nodulating Devosia strains differ from the only species currently described in that genus, Devosia riboflavina. From the same isolated colonies, we also located their nodD and nifH genes involved in nodulation and nitrogen fixation on a plasmid of approximately 170 kb. Sequence analysis showed that their nodD and nifH genes are most closely related to nodD and nifH of Rhizobium tropici, suggesting that this newly described Neptunia-nodulating Devosia species may have acquired these symbiotic genes by horizontal transfer.

Characterization of an ineffective actinorhizal microsymbiont, Frankia sp. EuI1 (Actinomycetales)

1980 ◽  
Vol 26 (9) ◽  
pp. 1072-1089 ◽  
Author(s):  
Dwight Baker ◽  
William Newcomb ◽  
John G. Torrey
Keyword(s):  
Host Range ◽  
Nitrogenase Activity ◽  
Root Nodules ◽  
Host Cells ◽  
Vesicle Formation ◽  
Nitrogen Fixing ◽  
Elaeagnus Umbellata

The actinomycete, Frankia sp. EuI1, isolated from root nodules of Elaeagnus umbellata is an infective endophyte but which lacks the ability to form an effective nitrogen-fixing symbiosis with its host. This ineffective organism can be distinguished easily from other frankiae, in vitro, on the basis of size, morphology, and the elaboration of a diffusible pigment. Cross-inoculation studies indicated that the host range of this symbiont is narrow and probably restricted to the Elaeagnaceae. In all cases of nodulation the symbiosis never developed nitrogenase activity and the microsymbiont never produced endophytic vesicles within the infected host cells. Sporangia were produced in vivo and in vitro so the morphogenetic block is apparently restricted to vesicle formation.

DOES ARCTOSTAPHYLOS UVA-URSI (BEARBERRY) HAVE NITROGEN-FIXING ROOT NODULES?

1978 ◽  
Vol 65 (6) ◽  
pp. 625-628
Author(s):  
W. N. Tiffney ◽  
D. R. Benson ◽  
D. E. Eveleigh
Keyword(s):  
Root Nodules ◽  
Nitrogen Fixing
Sign in / Sign up

Export Citation Format

Share Document