scholarly journals Integrated use of Rhizobium leguminosarum, Plant Growth Promoting Rhizobacteria and Enriched Compost for Improving Growth, Nodulation and Yield of Lentil (Lens culinaris Medik.)

2012 ◽  
Vol 72 (1) ◽  
pp. 104-110 ◽  
Author(s):  
Muhammad Asif Iqbal ◽  
Muhammad Khalid ◽  
Sher Muhammad Shahzad ◽  
Maqshoof Ahmad ◽  
Nawaf Soleman ◽  
...  
Keyword(s):  
Plant Growth ◽  
Lens Culinaris ◽  
Rhizobium Leguminosarum ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting

Rhizobium leguminosarum as a plant growth-promoting rhizobacterium: direct growth promotion of canola and lettuce

1996 ◽  
Vol 42 (3) ◽  
pp. 279-283 ◽  
Author(s):  
T. C. Noel ◽  
C. Sheng ◽  
C. K. Yost ◽  
R. P. Pharis ◽  
M. F. Hynes
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Rhizobium Leguminosarum ◽  
Growth Promotion ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Growth Promoting ◽  
Direct Growth ◽  
Early Seedling ◽  
Growth Promoting ◽  
Indole 3 Acetic Acid

Early seedling root growth of the nonlegumes canola (Brassica campestris cv. Tobin, Brassica napus cv. Westar) and lettuce (Lactuca saliva cv. Grand Rapids) was significantly promoted by inoculation of seeds with certain strains of Rhizobium leguminosarum, including nitrogen- and nonnitrogen-fixing derivatives under gnotobiotic conditions. The growfh-promotive effect appears to be direct, with possible involvement of the plant growth regulators indole-3-acetic acid and cytokinin. Auxotrophic Rhizobium mutants requiring tryptophan or adenosine (precursors for indole-3-acetic acid and cytokinin synthesis, respectively) did not promote growth to the extent of the parent strain. The findings of this study demonstrate a new facet of the Rhizobium–plant relationship and that Rhizobium leguminosarum can be considered a plant growth-promoting rhizobacterium (PGPR).Key words: Rhizobium, plant growth-promoting rhizobacteria, PGPR, indole-3-acetic acid, cytokinin, roots, auxotrophic mutants.

Effets de l'inoculation avec des souches deRhizobium leguminosarumbiovartrifoliisur la croissance du blé dans deux sols du Maroc

2001 ◽  
Vol 47 (6) ◽  
pp. 590-593 ◽  
Author(s):  
Abdelaly Hilali ◽  
Danielle Prévost ◽  
William J Broughton ◽  
Hani Antoun
Keyword(s):  
Plant Growth ◽  
Dry Matter ◽  
Rhizobium Leguminosarum ◽  
Agricultural Soils ◽  
Plant Growth Promoting Rhizobacteria ◽  
Silty Clay ◽  
Rotation System ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Pgpr Activity

One hundred strains of Rhizobium leguminosarum bv. trifolii were isolated from roots of wheat cultivated in rotation with clover in two different regions of Morocco. The isolates were first screened for their effect on the growth of the cultivar Rihane of wheat cultivated in an agricultural soil under greenhouse conditions. After 5 weeks of growth, 14 strains stimulating the fresh or dry matter yield of shoots were selected and used in a second pot inoculation trial performed with two different agricultural soils. The results show that the strains behaved differently according to the soil used. In the loamy sand Rabat, strain IAT 168 behaved potentially like a plant growth promoting rhizobacteria (PGPR), as indicated by the 24% increases (P < 0.1) observed in wheat shoot dry matter and grain yields. In the silty clay Merchouch, no PGPR activity was observed, and 6 strains showed a significant deleterious effect on yields. These observations suggest that it is very important in a crop rotation system to choose a R. leguminosarum bv. trifolii strain that is effective with clover and shows PGPR activity with wheat to avoid deleterious effects on wheat yields.Key words: deleterious bacteria, PGPR (plant growth promoting rhizobacteria), Trifolium alexandrinum, Triticum aestivum.

scholarly journals Plant Growth Promoting Rhizobacteria (PGPRs) Alter Plant Host Somatic Mutation Frequencies

2019 ◽  
Vol 5 (03) ◽  
pp. 149-154
Author(s):  
Jasmine M. Shah ◽  
Aparna C. ◽  
Pallavi S. Nair
Keyword(s):  
Plant Growth ◽  
Somatic Mutation ◽  
Post Infection ◽  
Rhizobium Leguminosarum ◽  
Somatic Mutations ◽  
Plant Growth Promoting Rhizobacteria ◽  
Pathogenic Strain ◽  
Plant Host ◽  
Plant Growth Promoting ◽  
Growth Promoting

Plant growth promoting rhizobacteria (PGPRs) are a group of soil bacteria which can induce positive growth in plants by different mechanisms. This work intends to find the effect of PGPRs on two classes of somatic mutations in the host, frame shift mutation (FSM) and somatic homologous recombination (SHR) and, compare the same with that of a pathogen. Somatic mutations in plants are important as they are an adaptation strategy to overcome stressful conditions and also get passed on to the next generations. The mutation detector Arabidopsis thaliana lines carrying a non-functional β-glucuronidase gene (GUS) were used to score the mutation events. One day-old mutant seedlings were co-cultivated with the PGPRs (Rhizobium leguminosarum and Pseudomonas fluorescens) and the pathogenic strain (P. syringae) for two different post-infection durations (4 h and 48 h). A reversion of the mutated GUS to its functional form resulted in blue spots in the host plant. Based on the number of blue spots seen, the mutation frequencies were estimated. An increase in FSM was observed in plants co-cultivated with R. leguminosarum for 4 h as well as 48 h. R. leguminosarum suppressed SHR frequency 4 h-post infection, which significantly increased at 48 h. In contrast, P. fluorescens infection lead to a temporal suppression of FSM and induction of SHR at 4 h. Subsequently, the SHR rates reduced significantly, i.e. lower than the uninfected controls at 48 h. The pathogenic strain P. syringae temporally increased FSM in plants and also enhanced SHR rates in plants 4 h post-infection, which also subsequently reduced 48 h post infection. To the best of our knowledge, there are no other reports comparing the effect of PGPRs on host somatic mutation rates.

scholarly journals Economic analysis of application of phosphorus, single and dual inoculation of Rhizobium and plant growth promoting rhizobacteria in lentil (Lens culinaris Medikus)

2017 ◽  
Vol 9 (2) ◽  
pp. 1008-1011
Author(s):  
Narinder Singh ◽  
Guriqbal Singh ◽  
Navneet Aggarwal
Keyword(s):  
Plant Growth ◽  
Lens Culinaris ◽  
Field Experiments ◽  
Plant Growth Promoting Rhizobacteria ◽  
Economic Returns ◽  
Net Returns ◽  
Plant Growth Promoting ◽  
Uninoculated Control ◽  
Growth Promoting ◽  
Four Levels

This study investigates the economic returns of lentil (Lens culinaris Medikus) by the use of phosphorus and biofertilizers [Rhizobium and plant growth promoting rhizobacteria (PGPR)] in Indian Punjab. The field experiments were conducted during Rabi 2013-14 and 2014-15 with combinations of four levels of phosphorus (0, 20, 30 and 40 kg P2O5 ha-1) and two/four biofertilizer treatments [uninoculated control and Rhizobium (LLR 12) + PGPR (RB 2)] in 2013-14, and uninoculated control, Rhizobium, PGPR and Rhizobium + PGPR in 2014-15) by replicating thrice. The use of 40 kg P2O5 ha-1 provided the highest gross returns whereas net returns and B:C were highest at 30 kg P2O5 ha-1. The combination of Rhizobium + PGPR + 40 kg P2O5 ha-1 provided the highest gross returns (Rs. 45902) whereas Rhizobium + PGPR+ 20 kg P2O5 ha-1 provided the highest net returns (Rs 20620). Furthermore, the integrated use of Rhizobium + PGPR + 20 kg P2O5 ha-1 provided higher net returns (Rs 20620) and B:C (1.88) as compared to sole application of 40 kg P2O5 ha-1 (Rs 18792 and 1.72). Thus, there was a net saving of 20 kg P2O5 ha-1 with the use of Rhizobium + PGPR inoculation without sacrificing the economics returns.

Field monitoring of plant-growth-promoting rhizobacteria by colony immunoblotting

2011 ◽  
Vol 57 (11) ◽  
pp. 914-922 ◽  
Author(s):  
Ganisan Krishnen ◽  
Mihály L. Kecskés ◽  
Michael T. Rose ◽  
Peter Geelan-Small ◽  
Khanok-on Amprayn ◽  
...  
Keyword(s):  
Plant Growth ◽  
Rhizobium Leguminosarum ◽  
Plant Growth Promoting Rhizobacteria ◽  
Potential Method ◽  
Soil Microflora ◽  
Plant Growth Promoting Bacteria ◽  
Whatman Filter Paper ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Filter Papers

Inoculant plant-growth-promoting bacteria are emerging as an important component of sustainable agriculture. There is a need to develop inexpensive methods for enumerating these organisms after their application in the field, to better understand their survival and impacts on yields. Immunoblotting is one potential method to measure viable cells, but the high cost of the conventionally used nylon membranes makes this method prohibitive. In this study, less expensive alternative materials such as filter papers, glossy photo papers, and transparencies for the purpose of colony immunoblotting were evaluated and the best substance was chosen for further studies. Whatman filter paper No. 541 combined with a 0.01 mol·L–1 H2SO4 rinsing step gave similar results to nylon membranes but <20% of the overall cost of the original colony immunoblotting assay. The application of the modified immunoblot method was tested on nonsterile clay soil samples that were spiked with high numbers (>107 CFU·g–1) of the plant-growth-promoting bacteria Pseudomonas fluorescens , Azospirillum brasilense , or Rhizobium leguminosarum . The modified protocol allowed the identification and recovery of over 50% of the inoculated cells of all three strains, amidst a background of the native soil microflora. Subsequently, the survival of P. fluorescens was successfully monitored for several months after application to field-grown rice at Jerilderie, New South Wales, Australia, thus validating the procedure.

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