Host Specific Nodulation: Effects of Multiple nodD Genes of Rhizobium meliloti

1987 ◽  
pp. 223-224 ◽  
Author(s):  
Mary A. Honma ◽  
Frederick M. Ausubel
Keyword(s):  
Rhizobium Meliloti

Strain Variation of Rhizobium meliloti on three Varieties of Medicago sativa 1

1953 ◽  
Vol 45 (12) ◽  
pp. 625-629 ◽  
Author(s):  
Lewis W. Erdman ◽  
Ura Mae Means
Keyword(s):  
Medicago Sativa ◽  
Rhizobium Meliloti ◽  
Strain Variation

Some Effects of Streptomyces albus and Penicillium Spp. on Rhizobium meliloti

1950 ◽  
Vol 14 (C) ◽  
pp. 188-191 ◽  
Author(s):  
Geo. D. Thornton ◽  
Jose de Alencar ◽  
F. B. Smith
Keyword(s):  
Rhizobium Meliloti ◽  
Streptomyces Albus ◽  
Penicillium Spp

EFFECTS OF SOIL ACIDITY ON RHIZOBIA NUMBERS, NODULATION AND NITROGEN FIXATION BY ALFALFA AND RED CLOVER

1977 ◽  
Vol 57 (2) ◽  
pp. 197-203 ◽  
Author(s):  
W. A. RICE ◽  
D. C. PENNEY ◽  
M. NYBORG
Keyword(s):  
Nitrogen Fixation ◽  
Soil Ph ◽  
Soil Acidity ◽  
Field Experiments ◽  
Rhizobium Meliloti ◽  
Acid Soils ◽  
Red Clover ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
Greenhouse Experiments

The effects of soil acidity on nitrogen fixation by alfalfa (Medicago sativa L.) and red clover (Trifolium pratense L.) were investigated in field experiments at 28 locations, and in greenhouse experiments using soils from these locations. The pH of the soils (limed and unlimed) varied from 4.5 to 7.2. Rhizobia populations in the soil, nodulation, and relative forage yields (yield without N/yield with N) were measured in both the field and greenhouse experiments. Rhizobium meliloti numbers, nodulation scores, and relative yields of alfalfa decreased sharply as the pH of the soils decreased below 6.0. For soils with pH 6.0 or greater, there was very little effect of pH on any of the above factors for alfalfa. Soil pH in the range studied had no effect on nodulation scores and relative yields of red clover. However, R. trifolii numbers were reduced when the pH of the soil was less than 4.9. These results demonstrate that hydrogen ion concentration is an important factor limiting alfalfa growth on acid soils of Alberta and northeastern British Columbia, but it is less important for red clover. This supports the continued use of measurements of soil pH, as well as plant-available Al and Mn for predicting crop response to lime.

scholarly journals Electrophoretic separation of the three Rhizobium meliloti replicons.

1991 ◽  
Vol 173 (16) ◽  
pp. 5173-5180 ◽  
Author(s):  
B W Sobral ◽  
R J Honeycutt ◽  
A G Atherly ◽  
M McClelland
Keyword(s):  
Rhizobium Meliloti ◽  
Electrophoretic Separation

Slow rehydration improves the recovery of dried bacterial populations

1992 ◽  
Vol 38 (6) ◽  
pp. 520-525 ◽  
Author(s):  
J. W. Kosanke ◽  
R. M. Osburn ◽  
G. I. Shuppe ◽  
R. S. Smith
Keyword(s):  
Relative Humidity ◽  
Rhizobium Leguminosarum ◽  
Moisture Absorption ◽  
Rhizobium Meliloti ◽  
Bacterial Populations ◽  
Bulk Powder ◽  
Alfalfa Seed ◽  
Powder Samples ◽  
Cellular Stresses ◽  
Rhizobium Leguminosarum Biovar Trifolii

Slow rehydration of bacteria from dried inoculant formulations provided higher viable counts than did rapid rehydration. Estimates were higher when clay and peat powder formulations of Rhizobium meliloti, Rhizobium leguminosarum biovar trifolii, and Pseudomonas putida, with water activities between 0.280 and 0.650, were slowly rehydrated to water activities of approximately 0.992 before continuing the dilution plating sequence. Rhizobium meliloti populations averaged 6.8 × 108 cfu/g and 1328 cfu/alfalfa seed greater when slowly rehydrated from bulk powder and preinoculated seeds, respectively. Bulk powder samples were slowly rehydrated to 0.992 water activity by the gradual addition of diluent, followed by a 10-min period for moisture equilibration. Preinoculated seed samples were placed in an environmental chamber at 24 °C with relative humidity greater than 80% for 1 h to allow moisture absorption. "Upshock," osmotic cellular stresses that occur during rehydration, was reduced when dried microbial formulations were slowly rehydrated and equilibrated before becoming fully hydrated in the dilution plating sequence. These procedures may also be applicable when estimating total viable bacterial populations from dried soil or other dry formulations. Key words: rehydration procedure, microbial rehydration, desiccation, Rhizobium, Pseudomonas.

scholarly journals Cloning and characterization of the katA gene of Rhizobium meliloti encoding a hydrogen peroxide-inducible catalase.

1996 ◽  
Vol 178 (23) ◽  
pp. 6802-6809 ◽  
Author(s):  
D Hérouart ◽  
S Sigaud ◽  
S Moreau ◽  
P Frendo ◽  
D Touati ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Rhizobium Meliloti

Evidence for Common Genetic Determinants of Nitrogenase and Nitrate Reductase in Rhizobium meliloti

1973 ◽  
Vol 246 (153) ◽  
pp. 153-154 ◽  
Author(s):  
Á. KONDOROSI ◽  
ILONA BARABÁS ◽  
ZÓRA SVÁB ◽  
L. OROSZ ◽  
T. SIK ◽  
...  
Keyword(s):  
Nitrate Reductase ◽  
Rhizobium Meliloti ◽  
Genetic Determinants

Stable incorporation of genetic material into the chromosome of Rhizobium meliloti 41: construction of an integrative vector system

Gene ◽  
1992 ◽  
Vol 119 (1) ◽  
pp. 9-15 ◽  
Author(s):  
Edit Hermesz ◽  
Ferenc Olasz ◽  
László Dorgai ◽  
László Orosz
Keyword(s):  
Rhizobium Meliloti ◽  
Genetic Material ◽  
Vector System ◽  
Integrative Vector ◽  
Stable Incorporation
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