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.

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.

scholarly journals PLANT GROWTH PROMOTING ACTIVITIES OF RHIZOBACTERIA ISOLATED FROM RHIZOSPHERIC SOILS OF RURAL BANGALORE, INDIA

2021 ◽  
Vol 21 (2) ◽  
Author(s):  
Sadhana Venkatesh ◽  
Sandeep Suryan ◽  
Nagananda Govinahalli Shivashankara ◽  
Swetha Seshagiri
Keyword(s):  
Plant Growth ◽  
Agricultural Soils ◽  
Soil Health ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Life ◽  
Drought And Salt Tolerance ◽  
Plant Growth Promoting Activities ◽  
Plant Growth Promoting ◽  
Acinetobacter Pittii ◽  
Growth Promoting

Soil is a dynamic ecosystem which provides support to plant life. Microorganisms inhabiting the rhizosphere region of soil play a key role in agriculture by promoting the exchange of plant nutrients and reducing the application of chemical fertilizers to a large extent. Engineering of rhizospheric region through exploitation of specific microorganisms leads to higher microbial diversity in the soil which in turn plays a significant role in maintaining the soil health. The present work envisages the isolation, screening and biochemical profiling of potent plant growth promoting rhizobacteria from various rhizospheric soils in and around Bangalore. Sixty isolates from rhizospheric region of fourteen different agricultural soils were screened for plant growth promoting traits such as phosphate solubilization, siderophore production, Ammonia, HCN & Phytohormone production. Twelve isolates that exhibited plant growth promotional traits were further subjected to screening for drought and salt tolerance. Among the twelve isolates, four potential isolates namely Serratia marcescens, Pseudomonas aeruginosa and Acinetobacter pittii were identified based on biochemical methods and 16SrRNA sequencing.

Plant growth promoting rhizobacteria (PGPR): Biofertiliser and Biocontrol agent-Review article

2019 ◽  
Vol 8 ◽  
pp. 42-45
Author(s):  
Anup Muni Bajracharya
Keyword(s):  
Plant Growth ◽  
Plant Pathogens ◽  
Agricultural Soils ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Productivity ◽  
Good Health ◽  
Systemic Resistance ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Good Food

Good health starts with good food. Humans expect agriculture to supply good food with sufficient nutrients, economically and culturally valued foods, fibers and other products. But the excessive application of synthetic pesticides has exerted an adverse effect on bio-flora, fauna and natural enemies. Even a largest part of yield has been lost due to various stresses, like biotic and abiotic stresses to the plant. On this account, plant growth promoting rhizobacteria (PGPR), an eco-friendly biopesticides is boon for the biocontrol of different plant pathogens. Moreover, PGPR strains can enhance the plant growth through the production of various plant growth promoting substances. These are generally a group of microorganism that is found either in the plane of the rhizosphere or above roots impacting some positive benefits to plants. PGPR are associated with plant roots and augment plant productivity and immunity; however, recent work by several groups shows that PGPR also elicit so-called 'induced systemic tolerance' to salt and drought. PGPR might also increase nutrient uptake from soils, thus reducing the need for fertilizers and preventing the accumulation of nitrates and phosphates in agricultural soils. Scientific researches involve multidisciplinary approaches to understand adaptation of PGPR, effects on plant physiology and growth, induced systemic resistance, biocontrol of plant pathogens, bio fertilization, and potential green alternative for plant productivity, viability of co inoculating, plant microorganism interactions, and mechanisms of root colonization.

scholarly journals Effect of Mesorhizobium, plant growth promoting rhizobacteria and phosphorus on plant biometery and growth indices of desi chickpea (Cicer arietinum L.)

2017 ◽  
Vol 9 (3) ◽  
pp. 1422-1428 ◽  
Author(s):  
Zorawar Singh ◽  
Guriqbal Singh ◽  
Navneet Aggarwal
Keyword(s):  
Growth Rate ◽  
Plant Growth ◽  
Plant Height ◽  
Dry Matter ◽  
Block Design ◽  
Plant Growth Promoting Rhizobacteria ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Four Levels ◽  
Phosphorus Application

The field experiment was conducted during 2015-16 to study the effect of biofetilizer inoculation [control, Mesorhizobium only, Mesorhizobium + RB-1 (Pseudomonas argentinensis) and Mesorhizobium + RB-2 (Bacillus aryabhattai)] and four levels of phosphorus (0, 15, 20 and 25 kg P2O5 ha-1) on chickpea growth. RB-1 and RB-2 were the plant growth promoting rhizobacteria (PGPR). Biofertilizers could play a crucial role in reducing the dependence on chemical fertilizers by fixing the atmospheric nitrogen for crop and/or by increasing the availability of phosphorus and phytohormones to the crop. The 16 treatment combinations were laid out in Factorial Randomized Complete Block Design and replicated three times. In biofertilizer treatments, Mesorhizobium + RB-1 proved superior over control and sole inoculation of Mesorhizobium and at par with Mesorhizobium + RB-2 with respect to plant height (cm), number of branches (plant-1), shoot and root dry matter (kg ha-1) which were recorded at 30, 60 90, 120 days after sowing (DAS) and at harvest. Application of 25 kg P2O5 ha-1 gave the highest values of all the growth at-tributes viz. plant height (60 cm), number of primary (5.3) and secondary (27.2) branches per plant, shoot dry matter (4000 kg ha-1) and root dry matter (354 kg ha-1) which were significantly higher than that of 0 and 15 kg P2O5 ha-1 and at par with 20 kg P2O5 ha-1. Similar results were observed in case of crop growth rate (CGR) whereas relative growth rate (RGR) was not influenced significantly by various biofertilizer and phosphorus treatments. The dual inoc-ulation with PGPR strains along with phosphorus application have a supplementary effect on the growth of chickpea.

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 Plant Growth-Promoting Rhizobacteria Modulate the Concentration of Bioactive Compounds in Tomato Fruits

Separations ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 223
Author(s):  
Clara de la Osa ◽  
Miguel Ángel Rodríguez-Carvajal ◽  
Jacinto Gandullo ◽  
Clara Aranda ◽  
Manuel Megías ◽  
...  
Keyword(s):  
Lipid Peroxidation ◽  
Plant Growth ◽  
Agricultural Soils ◽  
Antioxidant Activities ◽  
Plant Growth Promoting Rhizobacteria ◽  
Rice Paddy ◽  
Bioactive Molecules ◽  
Cultivated Rice ◽  
Plant Growth Promoting ◽  
Growth Promoting

Background: The application of microorganisms as bioestimulants in order to increase the yield and/or quality of agricultural products is becoming a widely used practice in many countries. In this work, five plant growth-promoting rhizobacteria (PGPR), isolated from cultivated rice paddy soils, were selected for their plant growth-promoting capacities (e.g., auxin synthesis, chitinase activity, phosphate solubilisation and siderophores production). Two different tomato cultivars were inoculated, Tres Cantos and cherry. Plants were grown under greenhouse conditions and different phenotypic characteristics were analysed at the time of harvesting. Results: Tres Cantos plants inoculated with PGPR produced less biomass but larger fruits. However, the photosynthetic rate was barely affected. Several antioxidant activities were upregulated in these plants, and no oxidative damage in terms of lipid peroxidation was observed. Finally, ripe fruits accumulated less sugar but, interestingly, more lycopene. By contrast, inoculation of cherry plants with PGPR had no effect on biomass, although photosynthesis was slightly affected, and the productivity was similar to the control plants. In addition, antioxidant activities were downregulated and a higher lipid peroxidation was detected. However, neither sugar nor lycopene accumulation was altered. Conclusion: These results support the use of microorganisms isolated from agricultural soils as interesting tools to manipulate the level of important bioactive molecules in plants. However, this effect seems to be very specific, even at the variety level, and deeper analyses are necessary to assess their use for specific applications.

Growth of lentil (Lens culinaris Medikus) as influenced by phosphorus, Rhizobium and plant growth promoting rhizobacteria

2016 ◽  
Author(s):  
Guriqbal Singh ◽  
Narinder Singh ◽  
Veena Khanna
Keyword(s):  
Plant Growth ◽  
Grain Yield ◽  
Plant Height ◽  
Dry Matter ◽  
Block Design ◽  
Plant Growth Promoting Rhizobacteria ◽  
Dry Matter Accumulation ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Phosphorus Application

The experiment was conducted to study the effect of four levels of phosphorus (0, 20, 30 and 40 kg P2O5 ha-1) and four biofertilizer treatments [uninoculated control, Rhizobium, plant growth promoting rhizobacteria (PGPR) and Rhizobium + PGPR] on growth and grain yield of lentil. The experiment was conducted in factorial randomized complete block design (RCBD) with three replications. The periodic data recorded at 30, 60, 90, 120 days after sowing (DAS) and at harvest showed that the highest growth in various parameters i.e. plant height, branches plant-1 and shoot dry matter accumulation was recorded with application of 40 kg P2O5 ha-1, however, it was at par with 30 P2O5 ha-1. Among the biofertilizers, Rhizobium + PGPR treatment gave maximum values of growth parameters like plant height, branches plant-1 and shoot dry matter accumulation at all the stages. At 30-60 DAS, the maximum crop growth rate (CGR) was recorded with the application of 40 kg P2O5 ha-1 (71.3 kg ha-1 day-1) and co-inoculation of Rhizobium and PGPR (72.0 kg ha-1 day-1). Application of 40 P2O5 ha-1 and use of coinoculation (Rhizobium + PGPR) provided the highest grain yields. The study highlights the importance of phosphorus application and biofertilizers inoculation for improving the growth and grain yield of lentil.

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