Cultivar and Rhizobium Strain Effects on Nitrogen Fixation and Remobilization by Soybeans 1

1981 ◽  
Vol 73 (3) ◽  
pp. 509-516 ◽  
Author(s):  
D. W. Israel
Keyword(s):  
Nitrogen Fixation ◽  
Rhizobium Strain ◽  
Strain Effects

Nodulation and nitrogen fixation by Vigna sinensis and Vicia atropurpurea: The influence of concentration, form, and site of application of combined nitrogen

1970 ◽  
Vol 21 (1) ◽  
pp. 45 ◽  
Author(s):  
PJ Dart ◽  
DC Wildon
Keyword(s):  
Nitrogen Fixation ◽  
Ammonium Nitrate ◽  
Root Nodules ◽  
Primary Root ◽  
Nitrogen Compound ◽  
Potassium Nitrate ◽  
Growth Patterns ◽  
Rhizobium Strain ◽  
Root Nodulation ◽  
Combined Nitrogen

Nitrogen fixation by Vigna sinesis nodulated effectively either by Rhizobium strain QA323 or by strain CB441 is little restricted by applications at sowing of ammonium nitrate up to 24 mg nitrogen per plant. The growth patterns of these two associations are differentially affected by nitrogen level, and are both considerably different from that of unnodulated plants given combined nitrogen. Nitrogen fixation by V. sinensis-strain SU318 may be stimulated by small doses of combined nitrogen at sowing, but for Vicia atvopurpurea all the combined nitrogen levels used in these experiments depressed fixation. Primary root nodulation of V. atropurpurea by the effective Rhizobium strain V27E and the ineffective strain NA6, and of V. sinensis by the effective Rhizobium strain SU318, is influenced by the form and amount of the nitrogen compound applied (ammonium nitrate, potassium nitrate, ammonium sulphate, or urea), and that of V. atropurpurea is also influenced by the Rhizobium strain. These forms of combined nitrogen restrict primary root nodulation on both hosts similarly except that urea has little effect on V. atuopurpurea. In both species many more nodules formed on the secondary roots than on the primary, but numbers of secondary root nodules are little affected by the combined nitrogen. Immersion of the first leaves of V. sinensis seedlings in solutions of combined nitrogen depressed nodulation, but urea slightly increased the dry weight of tops.

Nitrogen fixation in soybean as influenced by cultivar and Rhizobium strain

1987 ◽  
Vol 99 (1) ◽  
pp. 163-174 ◽  
Author(s):  
S. K. A. Danso ◽  
C. Hera ◽  
C. Douka
Keyword(s):  
Nitrogen Fixation ◽  
Rhizobium Strain

Rhizobium Strain Effects on the Growth and Nitrogen Assimilation in Pisum sativum and Vicia faba Plant Growth under Salt Stress

1999 ◽  
Vol 154 (1) ◽  
pp. 127-131 ◽  
Author(s):  
Maria Del Pilar Cordovilla ◽  
Sandra Isabel Berrido ◽  
Francisco Ligero ◽  
Carmen Lluch
Keyword(s):  
Salt Stress ◽  
Pisum Sativum ◽  
Plant Growth ◽  
Vicia Faba ◽  
Nitrogen Assimilation ◽  
Rhizobium Strain ◽  
Strain Effects

scholarly journals Rhizobial Plasmids That Cause Impaired Symbiotic Nitrogen Fixation and Enhanced Host Invasion

2012 ◽  
Vol 25 (8) ◽  
pp. 1026-1033 ◽  
Author(s):  
Matthew B. Crook ◽  
Daniel P. Lindsay ◽  
Matthew B. Biggs ◽  
Joshua S. Bentley ◽  
Jared C. Price ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Genetic Factors ◽  
Symbiotic Nitrogen Fixation ◽  
N Fixation ◽  
Nodule Occupancy ◽  
Rhizobium Strain ◽  
Ecological Stability ◽  
Naturally Occurring ◽  
Late Stages ◽  
Diverse Strain

The genetic rules that dictate legume-rhizobium compatibility have been investigated for decades, but the causes of incompatibility occurring at late stages of the nodulation process are not well understood. An evaluation of naturally diverse legume (genus Medicago) and rhizobium (genus Sinorhizobium) isolates has revealed numerous instances in which Sinorhizobium strains induce and occupy nodules that are only minimally beneficial to certain Medicago hosts. Using these ineffective strain-host pairs, we identified gain-of-compatibility (GOC) rhizobial variants. We show that GOC variants arise by loss of specific large accessory plasmids, which we call HR plasmids due to their effect on symbiotic host range. Transfer of HR plasmids to a symbiotically effective rhizobium strain can convert it to incompatibility, indicating that HR plasmids can act autonomously in diverse strain backgrounds. We provide evidence that HR plasmids may encode machinery for their horizontal transfer. On hosts in which HR plasmids impair N fixation, the plasmids also enhance competitiveness for nodule occupancy, showing that naturally occurring, transferrable accessory genes can convert beneficial rhizobia to a more exploitative lifestyle. This observation raises important questions about agricultural management, the ecological stability of mutualisms, and the genetic factors that distinguish beneficial symbionts from parasites.

scholarly journals Draft Genome Sequence of Paraburkholderia sp. UYCP14C, a Rhizobium Strain Isolated from Root Nodules of Calliandra parvifolia

2019 ◽  
Vol 8 (16) ◽  
Author(s):  
Mauricio Langleib ◽  
Martín Beracochea ◽  
María Zabaleta ◽  
Federico Battistoni ◽  
José Sotelo-Silveira ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Genome Size ◽  
Genome Sequence ◽  
Root Nodules ◽  
Draft Genome ◽  
Draft Genome Sequence ◽  
Rhizobium Strain ◽  
Protein Coding ◽  
Coding Sequences ◽  
Content Type

Here, we present the draft genome sequence of strain UYCP14C, a rhizobium isolated from Calliandra parvifolia nodules. The assembled genome size was around 9.8 million bp, containing 9,031 predicted protein-coding sequences, including several symbiotic and nitrogen fixation genes.

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