scholarly journals Diversity of new root nodule bacteria from Erythrina velutina Willd., a native legume from the Caatinga dry forest (Northeastern Brazil)

2016 ◽  
Vol 39 (2) ◽  
pp. 222-233 ◽  
Author(s):  
Kelly Alexsandra Souza Menezes ◽  
Gersika Fakirra de Oliveira Nunes ◽  
Aline Araujo Sampaio ◽  
Aleksandro Ferreira Silva ◽  
Layane Silva Barbosa Souza ◽  
...  
Keyword(s):  
Root Nodule ◽  
Dry Forest ◽  
Northeastern Brazil ◽  
Nodule Bacteria ◽  
Root Nodule Bacteria ◽  
Native Legume

Distribution, frequency of occurrence and symbiotic properties of the Australian native legume Trigonella suavissima Lindl. and its associated root-nodule bacteria

2010 ◽  
Vol 32 (4) ◽  
pp. 395 ◽  
Author(s):  
J. Brockwell ◽  
Catherine M. Evans ◽  
Alison M. Bowman ◽  
Alison McInnes
Keyword(s):  
Root Nodule ◽  
Clay Soils ◽  
Frequency Of Occurrence ◽  
Nitrogen Fixing ◽  
Nodule Bacteria ◽  
River Systems ◽  
Root Nodule Bacteria ◽  
North East ◽  
Inland River ◽  
Native Legume

Trigonella suavissima Lindl. is an Australian native legume belonging to the tribe Trifolieae. It is an ephemeral species that is widely distributed in the arid interior of the continent where it occurs, following periodic inundation, on clay soils of the watercourse country of the Channel Country (far-western Queensland, north-east South Australia and north-western New South Wales). T. suavissima is the only member of its tribe that is endemic to Australia. Likewise, its root-nodule bacteria (Sinorhizobium sp.) may be the only member of its taxonomic group (S. meliloti, S. medicae) that is an Australian native. The distribution and frequency of occurrence of T. suavissima and the size of soil populations (density) of Sinorhizobium were monitored at 64 locations along inland river systems of the Channel Country. Measurements were made of (i) the nitrogen-fixing effectiveness of the symbioses between T. suavissima and strains of its homologous Sinorhizobium and (ii) the nitrogen-fixing effectiveness of the symbioses between legumes symbiotically related to T. suavissima and diverse strains of Sinorhizobium. It was concluded that the distribution and frequency of occurrence of T. suavissima is soil related. The species is most widespread on fine-textured clay soils with deep, self-mulching surfaces and high moisture-holding capacity. By contrast, the occurrence of T. suavissima is sporadic in the upper reaches of the inland river systems where the soils are poorly structured clays with lower moisture-holding capacity. Sinorhizobium is most abundant where the plant is most common. The nitrogen-fixing symbioses between T. suavissima and strains of Sinorhizobium isolated from soils across the region were consistently effective and often highly effective. Some of these strains fixed a little nitrogen with lucerne (Medicago sativa L.). T. suavissima also had some symbiotic (nitrogen-fixing) affinity with an exotic Trigonella (T. arabica Del.). The economic value of T. suavissima (and its symbiosis with Sinorhizobium) to the beef industry in the Channel Country is discussed.

scholarly journals Genetic Variability and Symbiotic Efficiency of Erythrina velutina Willd. Root Nodule Bacteria from the Semi-Arid Region in Northeastern Brazil

2017 ◽  
Vol 41 (0) ◽  
Author(s):  
Kelly Alexsandra Souza Menezes ◽  
Indra Elena Costa Escobar ◽  
Ana Carla Resende Fraiz ◽  
Lindete Míria Vieira Martins ◽  
Paulo Ivan Fernandes Júnior
Keyword(s):  
Genetic Variability ◽  
Arid Region ◽  
Root Nodule ◽  
Northeastern Brazil ◽  
Nodule Bacteria ◽  
Symbiotic Efficiency ◽  
Root Nodule Bacteria ◽  
Semi Arid Region ◽  
Semi Arid

Oxidation and assimilation of glucose by the root nodule bacteria

1942 ◽  
Vol 19 (3) ◽  
pp. 361-371 ◽  
Author(s):  
R. H. Burris ◽  
P. W. Wilson
Keyword(s):  
Root Nodule ◽  
Nodule Bacteria ◽  
Root Nodule Bacteria

Bacteriophage and the root nodule bacteria

1932 ◽  
Vol 3 (1) ◽  
pp. 159-193 ◽  
Author(s):  
D. G. Laird
Keyword(s):  
Root Nodule ◽  
Nodule Bacteria ◽  
Root Nodule Bacteria

Functional Specificity of the nifA Gene Product within the Group of Root Nodule Bacteria

Microbiology ◽  
2021 ◽  
Vol 90 (4) ◽  
pp. 481-488
Author(s):  
A. A. Vladimirova ◽  
R. S. Gumenko ◽  
E. S. Akimova ◽  
Al. Kh. Baymiev ◽  
An. Kh. Baymiev
Keyword(s):  
Gene Product ◽  
Root Nodule ◽  
Nodule Bacteria ◽  
Functional Specificity ◽  
Root Nodule Bacteria ◽  
Nifa Gene

scholarly journals Quantitative evaluation of acidity tolerance of root nodule bacteria

1999 ◽  
Vol 30 (3) ◽  
pp. 203-208 ◽  
Author(s):  
Luiz Antonio de Oliveira ◽  
Hélio Paracaima de Magalhães
Keyword(s):  
Root Nodule ◽  
Maximum Growth ◽  
Nodule Bacteria ◽  
Root Nodule Bacteria ◽  
Soil Persistence ◽  
Statistical Precision ◽  
Visible Growth ◽  
Selection For ◽  
Growth Scores ◽  
Selection Of

Quantification of acidity tolerance in the laboratory may be the first step in rhizobial strain selection for the Amazon region. The present method evaluated rhizobia in Petri dishes with YMA medium at pH 6.5 (control) and 4.5, using scores of 1.0 (sensitive, "no visible" growth) to 4.0 (tolerant, maximum growth). Growth evaluations were done at 6, 9, 12, 15 and 18 day periods. This method permits preliminary selection of root nodule bacteria from Amazonian soils with statistical precision. Among the 31 rhizobia strains initially tested, the INPA strains 048, 078, and 671 presented scores of 4.0 at both pHs after 9 days of growth. Strain analyses using a less rigorous criterion (growth scores higher than 3.0) included in this highly tolerant group the INPA strains 511, 565, 576, 632, 649, and 658, which grew on the most diluted zone (zone 4) after 9 days. Tolerant strains still must be tested for nitrogen fixation effectiveness, competitiveness for nodule sites, and soil persistence before their recommendation as inoculants.

Application of molecular techniques to studies in Rhizobium ecology: a review

2001 ◽  
Vol 41 (3) ◽  
pp. 299 ◽  
Author(s):  
J. E. Thies ◽  
E. M. Holmes ◽  
A. Vachot
Keyword(s):  
Root Nodule ◽  
Molecular Techniques ◽  
Nodule Bacteria ◽  
Bacterial Genomes ◽  
Root Nodule Bacteria ◽  
Bacterial Signaling ◽  
Field Environment ◽  
Background Population ◽  
Insight Into ◽  
Made In

The symbiosis between legumes and their specific root-nodule bacteria, rhizobia, has been employed to improve agricultural productivity for most of the 20th century. During this time, great advances have been made in our knowledge of both plant and bacterial genomes, the biochemistry of the symbiosis, plant and bacterial signaling and the measurement of nitrogen fixation. However, knowledge of the ecology of the bacterial symbiont has lagged behind, largely due to a lack of practical techniques that can be used to monitor and assess the performance of these bacteria in the field. Most techniques developed in the last few decades have relied on somehow ‘marking’ individual strains to allow us to follow their fate in the field environment. Such techniques, while providing knowledge of the success or failure of specific strains in a range of environments, have not allowed insight into the nature of the pre-existing rhizobial populations in these sites, nor the interaction between marked strains and the background population. The advent of molecular techniques has revolutionised the study of Rhizobium ecology by allowing us to follow the flux of a variety of ecotypes within a particular site and to examine how introduced rhizobia interact with a genetically diverse background. In addition, molecular techniques have increased our understanding of how individual strains and populations of root-nodule bacteria respond to changes in the environment and how genetic diversity evolves in field sites over time. This review focuses on recently developed molecular techniques that hold promise for continuing to develop our understanding of Rhizobium ecology and how these can be used to address a range of applied problems to yield new insights into rhizobial life in soil and as legume symbionts.

Sign in / Sign up

Export Citation Format

Share Document