scholarly journals Agrobacterium radiobacter

2020 ◽  
Author(s):  
Keyword(s):  
Agrobacterium Radiobacter

Biodegradation of chlorophenols by immobilized pure-culture microorganisms

1996 ◽  
Vol 34 (10) ◽  
pp. 67-72 ◽  
Author(s):  
Lu Chih-Jen ◽  
Lee Chi-Mei ◽  
Huang Chiou-Zong
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Pseudomonas Putida ◽  
Pure Culture ◽  
The Other ◽  
Batch Reactors ◽  
Agrobacterium Radiobacter ◽  
Culture Cells ◽  
Lag Period

The biodegradation of phenol and chlorophenols by immobilized pure-culture cells was conducted by a series of batch reactors. The microorganisms used in this study were Pseudomonas putida, Psuedomonas testosteroni, Pseudomonas aeruginosa, and Agrobacterium radiobacter. All four species showed the ortho-cleavage pathway to metabolize chlorophenols. Among the four species, P. testosteroni, P. putida, and P. aeruginosa could effectively remove phenol at 200 mg/l. P. testosteroni could effectively remove 2-chlorophenol at 10mg/l. However, the other three species, P. putida, P. aeruginosa, and A. radiobacter, could not effectively remove 2-chlorophenol. Although 3-chlorophenol is a recalcitrant compound, P. testosteroni also could rapidly metabolize 3-chlorophenol at 10 mg/l. The removal of 4-chlorophenol at 10 mg/l by P. testosteroni reached 98% within one day. P. aeruginosa and A. radiobacter also could metabolize 4-chlorophenol after 2 and 7 days of lag period, respectively.

Phosphate-bound structure of an organophosphate-degrading enzyme from Agrobacterium radiobacter

2012 ◽  
Vol 106 (1) ◽  
pp. 19-22 ◽  
Author(s):  
Fernanda Ely ◽  
Marcelo M. Pedroso ◽  
Lawrence R. Gahan ◽  
David L. Ollis ◽  
Luke W. Guddat ◽  
...  
Keyword(s):  
Agrobacterium Radiobacter ◽  
Degrading Enzyme

Effect of culture medium ions on chromate reduction by resting cells of Agrobacterium radiobacter

1993 ◽  
Vol 39 (3) ◽  
Author(s):  
Santiago LLovera ◽  
Ramon Bonet ◽  
MariaDolores Simon-Pujol ◽  
Francisco Congregado
Keyword(s):  
Culture Medium ◽  
Chromate Reduction ◽  
Resting Cells ◽  
Agrobacterium Radiobacter

THE INFLUENCE OF SOIL AND ROOT EXTRACTS ON THE ASSOCIATIVE GROWTH OF SELECTED SOIL BACTERIA

1963 ◽  
Vol 9 (2) ◽  
pp. 187-197 ◽  
Author(s):  
E. C. S. Chan ◽  
H. Katznelson ◽  
J. W. Rouatt
Keyword(s):  
Mixed Culture ◽  
Soil Bacteria ◽  
Agar Medium ◽  
Soil Extract ◽  
Antagonistic Effect ◽  
Pseudomonas Sp ◽  
Population Changes ◽  
Agrobacterium Radiobacter ◽  
Root Extracts ◽  
Wheat Population

These studies are concerned with the growth interrelationships of mixed cultures of five soil organisms in soil extract and root extracts of 2-, 4-, and 8-week-old oats, soybeans, and wheat. Population changes of Agrobacterium radiobacter, Arthrobacter citreus, Azotobacter chroococcum, Bacillus cereus, and a Pseudomonas sp. in pure and mixed culture were followed by plating on selective media. B. cereus and A. chroococcum grew poorly alone or in mixed culture in the extracts. In soil extract, A. citreus predominated over, or was nearly equal in number to, the Gram-negative forms (Pseudomonas and Agrobacterium). In root extracts, Pseudomonas sp. always predominated over A. citreus in mixed culture. A. radiobacter was inhibited in mature root extracts (8-week-old plants) although in pure culture it recovered after a period. An antagonistic effect of Pseudomonas sp. on A. chroococcum plated on nitrogen-free agar medium was found to be related to the kind of agar used.

scholarly journals Acquisition of an Agrobacterium Ri Plasmid and Pathogenicity by Other α-Proteobacteria in Cucumber and Tomato Crops Affected by Root Mat

2004 ◽  
Vol 70 (5) ◽  
pp. 2779-2785 ◽  
Author(s):  
S. A. Weller ◽  
D. E. Stead ◽  
J. P. W. Young
Keyword(s):  
Pathogenicity Test ◽  
Agrobacterium Radiobacter ◽  
Rrna Sequence ◽  
16S Rrna Sequence ◽  
Ri Plasmid ◽  
Fatty Acid Profiling ◽  
Transformation Rates ◽  
16S Rrna Sequence Analysis ◽  
Average Transformation

ABSTRACT Root mat of cucumbers and tomatoes has previously been shown to be caused by Agrobacterium radiobacter strains harboring a root-inducing Ri plasmid (pRi). Nine other pRi-harboring α-Proteobacteria have subsequently been isolated from root mat-infected crops. Fatty acid profiling and partial 16S rRNA sequence analysis identified three of these strains as being in the genus Ochrobactrum, five as being in the genus Rhizobium, and one as being in the genus Sinorhizobium. An in vitro pathogenicity test involving inoculation of cucumber cotyledons was developed. All pRi-harboring α-Proteobacteria induced typical root mat symptoms from the cotyledons. Average transformation rates for rhizogenic Ochrobactrum (46%) and Rhizobium (44%) strains were lower than those observed for rhizogenic A. radiobacter strains (64%). However, individual strains from these three genera all had transformation rates comparable to those observed from cotyledons inoculated with a rhizogenic Sinorhizobium strain (75%).

SENSITIVITY AND ADAPTATION OF SELECTED RHIZOBIA AND AGROBACTERIA TO PARAQUAT

1985 ◽  
Vol 65 (3) ◽  
pp. 555-562 ◽  
Author(s):  
E. B. ROSLYCKY
Keyword(s):  
Key Words ◽  
Genetic Effect ◽  
Agrobacterium Radiobacter ◽  
Plant Weight ◽  
Fast Growing ◽  
Plant Symbiont ◽  
Paraquat Resistance ◽  
Rhizobium Lupini ◽  
The Relationship ◽  
Slow Growing

Sensitivity to paraquat as function of growth varied considerably among 15 rhizobia from seven cross-inoculation groups and 13 agrobacteria from five different species. No relationship was evident between the sensitivity and the "fast-growing" or the "slow-growing" characteristics among the rhizobia. The agrobacteria were uniformly less sensitive. Maximum stabilized paraquat resistance induced by the adptations ranged from 200 μg paraquat∙mL−1 in Rhizobium lupini 112, to 20 000 μg paraquat∙mL−1 in Agrobacterium radiobacter R-590 and A. tumefaciens A6-K1. No relationship was found between the sensitivity and the adaptability. Identical lytic patterns with six bacteriophages confirmed the relationship between the adapted and parent cultures suggesting no genetic effect of paraquat on susceptibility to lysis. The bacteria-plant symbiont interaction, including nodulation, plant weight, vigor and color, was unaffected by the adaptations to paraquat resistance. Similarly, the adaptations exerted no effect on tumorigenicity of A. tumefaciens A6-K1. Key words: Rhizobia, agrobacteria, adaptation, herbicides, paraquat, N2-fixation

scholarly journals Agrobacterium radiobacter Endophthalmitis Associated with Baerveldt Tube Exposure

2021 ◽  
Vol 12 (3) ◽  
pp. 921-926
Author(s):  
Landon J. Rohowetz ◽  
Nimesh A. Patel ◽  
Ann V. Quan ◽  
Kenneth C. Fan ◽  
Nicolas A. Yannuzzi ◽  
...  
Keyword(s):  
Pars Plana Vitrectomy ◽  
Silicone Oil ◽  
Late Onset ◽  
Subsequent Treatment ◽  
Agrobacterium Radiobacter ◽  
Negative Bacillus ◽  
Initial Improvement ◽  
Pars Plana ◽  
Baerveldt Tube ◽  
Clinical Worsening

<i>Agrobacterium radiobacter</i> is a Gram-negative bacillus and a rare cause of endophthalmitis. An 85-year-male presented with late-onset endophthalmitis associated with exposure of an inferonasal Baerveldt tube. The patient was initially treated with anterior chamber paracentesis and intravitreal antibiotics. Aqueous humor culture revealed <i>A. radiobacter</i> resistant to cefazolin, ceftazidime, amikacin, tobramycin, and trimethoprim-sulfamethoxazole. Subsequently, the patient underwent explantation of the glaucoma drainage implant (GDI). After initial improvement, the patient had clinical worsening and was diagnosed with recurrence. Subsequent treatment involved explantation of the second GDI in addition to pars plana vitrectomy with silicone oil infusion, intraocular lens removal, and administration of intravitreal antibiotics. Visual acuity improved but remained at count fingers at 2 weeks. This is the first reported patient with <i>A. radiobacter</i> endophthalmitis associated with an exposed GDI. This report illustrates the resistant nature of this organism in addition to the efficacy of silicone oil administration and intraocular prosthesis explantation.

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