scholarly journals Melatonin and plant growth-promoting rhizobacteria alleviate the cadmium and arsenic stresses and increase the growth of Spinacia oleracea L.

2020 ◽  
Vol 66 (No. 5) ◽  
pp. 234-241 ◽  
Author(s):  
Mahnoor Asif ◽  
Arshid Pervez ◽  
Usman Irshad ◽  
Qaisar Mehmood ◽  
Rafiq Ahmad
Keyword(s):  
Lipid Peroxidation ◽  
Antioxidant Enzymes ◽  
Plant Growth ◽  
Spinacia Oleracea ◽  
Plant Growth Promoting Rhizobacteria ◽  
Exogenous Melatonin ◽  
Spinacia Oleracea L ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
The Impact

Melatonin (N-acetyl-5-methoxytryptamine) is a recently discovered natural product that helps the plant to cope with environmental stresses. In the same way, plant growth-promoting rhizobacteria colonise plant roots and enhance plant stress tolerance. To study the impact of exogenous melatonin and Bacillus licheniformis on the growth of Spinacia oleracea L. seedlings were treated with 100 µmol exogenous melatonin and B. licheniformis under cadmium (Cd) and arsenic (As) stresses by a pot experiment. Different plant growth parameters, antioxidant enzymes, and lipid peroxidation were studied. The results showed that melatonin application and B. licheniformis inoculation alleviated As and Cd toxicity by significantly reducing the negative impacts of stresses and increasing the fresh and dry weight as well as preventing the damage to the chlorophyll content of S. oleracea L. Moreover, supplementation of melatonin, and B. licheniformis, enhanced activities of antioxidant enzymes superoxide dismutase, peroxidase, catalase, thus acting as a line of defense against As and Cd stresses. Similarly, lipid peroxidation was also inhibited by exogenous melatonin and B. licheniformis inoculation. Exogenous application of melatonin and inoculating roots of S. oleracea L. with B. licheniformis found to ameliorate the harmful effects of As and Cd contamination.

Impact of intercropping and co-inoculation with strains of plant growth-promoting rhizobacteria on phosphorus and nitrogen concentrations and yield of durum wheat (Triticum durum) and faba bean (Vicia faba)

2019 ◽  
Vol 70 (8) ◽  
pp. 649
Author(s):  
Noura Bechtaoui ◽  
Abdelkhalek El Alaoui ◽  
Anas Raklami ◽  
Loubna Benidire ◽  
Abdel-ilah Tahiri ◽  
...  
Keyword(s):  
Plant Growth ◽  
Durum Wheat ◽  
Vicia Faba ◽  
Faba Bean ◽  
Triticum Durum ◽  
Plant Growth Promoting Rhizobacteria ◽  
Agricultural Practice ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
The Impact

Intercropping is a farming practice that fights pests and diseases and improves plant growth. The use of plant growth-promoting rhizobacteria (PGPR) strains to boost the yield of intercrops constitutes a promising tool in agricultural practice. This study investigated the impact of single inoculation and co-inoculation with PGPR on plant biomass and phosphorus (P) and nitrogen (N) concentrations under different cropping systems. Two PGPR strains with different traits were selected: PGP13 (Rahnella aquatilis) and PS11 (Pseudomonas sp.). A greenhouse experiment was designed using durum wheat (Triticum durum L.) and faba bean (Vicia faba L.), sole cropped or intercropped, including four inoculation treatments: (i) uninoculated, (ii) inoculated with PS11 (iii) inoculated with PGP13, and (iv) co-inoculated with PS11 + PGP13. Co-inoculation under the intercropping system improved plant dry matter and enhanced bean pod and wheat spike weights to 685.83% and 385.83%, respectively, of the values for uninoculated, intercropped plants. Higher P and N concentrations were detected in intercropped, co-inoculated plants and in bean pods and wheat spikes. The results were then submitted to principal component analysis, showing that treatments with higher biomass and nutrient concentrations were strongly correlated with intercropped, co-inoculated plants.

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.

scholarly journals Plant Growth-Promoting Rhizobacteria as a Green Alternative for Sustainable Agriculture

2021 ◽  
Vol 13 (19) ◽  
pp. 10986
Author(s):  
Hema Chandran ◽  
Mukesh Meena ◽  
Prashant Swapnil
Keyword(s):  
Plant Growth ◽  
Sustainable Agriculture ◽  
Growth Promotion ◽  
Plant Growth Promoting Rhizobacteria ◽  
Antioxidant Systems ◽  
Cell Organelles ◽  
Positive Interaction ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
The Impact

Environmental stress is a major challenge for sustainable food production as it reduces yield by generating reactive oxygen species (ROS) which pose a threat to cell organelles and biomolecules such as proteins, DNA, enzymes, and others, leading to apoptosis. Plant growth-promoting rhizobacteria (PGPR) offers an eco-friendly and green alternative to synthetic agrochemicals and conventional agricultural practices in accomplishing sustainable agriculture by boosting growth and stress tolerance in plants. PGPR inhabit the rhizosphere of soil and exhibit positive interaction with plant roots. These organisms render multifaceted benefits to plants by several mechanisms such as the release of phytohormones, nitrogen fixation, solubilization of mineral phosphates, siderophore production for iron sequestration, protection against various pathogens, and stress. PGPR has the potential to curb the adverse effects of various stresses such as salinity, drought, heavy metals, floods, and other stresses on plants by inducing the production of antioxidant enzymes such as catalase, peroxidase, and superoxide dismutase. Genetically engineered PGPR strains play significant roles to alleviate the abiotic stress to improve crop productivity. Thus, the present review will focus on the impact of PGPR on stress resistance, plant growth promotion, and induction of antioxidant systems in plants.

scholarly journals Stimulation Impact of Rhizospheric Microbe’s Glomeromycota AM Fungi and Plant Growth Promoting Rhizobacteria on Growth, Productivity, Lycopene, Β-Carotene, Antioxidant Activity and Mineral Contents of Tomato beneath Field Condition Cultivated in Western Ghats Covering Semi-Arid Region of Maharashtra, India

2021 ◽  
Keyword(s):  
Antioxidant Activity ◽  
Plant Growth ◽  
Mycorrhizal Fungi ◽  
Am Fungi ◽  
Plant Growth Promoting Rhizobacteria ◽  
Maximum Height ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
The Impact ◽  
Β Carotene

The rhizosphere is the slim region of soil that’s directly influenced by root secretions and accompanying soil microorganisms known as root microbiome. The rhizosphere involving the soil pores comprises numerous beneficial bacterium and others different microorganisms. Microbial communities play a vital role within the functioning of plants by stimulating their morphology, physiology and development. Several species of the rhizosphere microorganism are helpful to plant growth and overall productivity. The useful plant-microbe associations within the rhizosphere are the principal determinants of plant and soil health (SH). Rhizobacteria comprise mycorrhization helper microorganism and plant growth promoting rhizobacteria (PGPR) are support arbuscular mycorrhizal fungi (AM fungi) to colonize the plant roots. Tomato is the second most common cultivated vegetable within the world for biological process and functions. Tomato has high values in soluble fat, vitamin A, B, C, lycopene, flavonoids, and β-carotene and is of course low in calories. Tomato consumption are extremely useful to human health (HH) because of several crucial nutrients are accessible. In current study, the impact of inoculating tomato with consortium AM fungi and PGPR on growth, fruit quality and productivity was estimated. The inoculated AM fungi are containing Aculospora logula-15%, Glomus fasciculatum-20%, Glomus intraradices-40%, Gigaspora margarita-15% and Scutellospora heterogama-10% infective propagules in inoculum. The consortium PGPR treatments were inoculated with Azotobacter chroococcum, Pseudomonas fluoresces and Fraturia aurantia (10-9CFU/g) and also the Control [100% Recommended Rate of fertilizers (RRF)] treatment was without microbial inoculated. Phyto-morpho-chemical factors, containing Lycopene, β-carotene, antioxidant activity, growth, fruit yield, fruit potassium (K) and macro and micro nutrients uptake in shoot were improved by AM fungi and PGPR mediated tomato as compared with control (100% RRF). Maximum lycopene, β-carotene, fruit K and antioxidant activity (AA) were recorded in plants treated with multiple biostimulants of AM fungi + PGPR treatment. Maximum height, biomass and marketable yield were observed in AM fungi + PGPR treated plants and minimum in control (100% RRF). A correlational statistics between lycopene, β-carotene, AA with fruit and shoot K (P

scholarly journals Plant growth promoting rhizobacteria improve growth and yield related attributes of chili under low nitrogen availability

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0261468
Author(s):  
Ali Raza ◽  
Shaghef Ejaz ◽  
Muhammad Shahzad Saleem ◽  
Vaclav Hejnak ◽  
Furqan Ahmad ◽  
...  
Keyword(s):  
Plant Growth ◽  
Management Practices ◽  
Growth Traits ◽  
Plant Growth Promoting Rhizobacteria ◽  
Crop Plants ◽  
Growth And Yield ◽  
Control Treatment ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
The Impact

Nitrogen (N) is a macronutrient desired by crop plants in large quantities. However, hiking fertilizer prices need alternative N sources for reducing its requirements through appropriate management practices. Plant growth promoting rhizobacteria (PGPR) are well-known for their role in lowering N requirements of crop plants. This study assessed the impact of PGPR inoculation on growth, allometry and biochemical traits of chili under different N doses. Two PGPR, i.e., Azospirillum ‘Er-20’ (nitrogen fixing) and Agrobacterium ‘Ca-18’ (phosphorous solubilizing) were used for inoculation, while control treatment had no PGPR inoculation. Six N doses, i.e., 100, 80, 75, 70, 60 and 50% of the N required by chili were included in the study. Data relating to growth traits, biochemical attributes and yield related traits were recorded. Interaction among N doses and PGPR inoculation significantly altered all growth traits, biochemical attributes and yield related traits. The highest values of the recorded traits were observed for 100% N with and without PGPR inoculation and 75% N with PGPR inoculation. The lowest values of the recorded traits were noted for 50% N without PGPR inoculation. The PGPR inoculation improved the measured traits compared to the traits recorded noted in same N dose without PGPR inoculation. Results revealed that PGPR had the potential to lower 25% N requirement for chili. Therefore, it is recommended that PGPR must be used in chili cultivation to lower N requirements.

Prediction and validation of gold nanoparticles (GNPs) on plant growth promoting rhizobacteria (PGPR): a step toward development of nano-biofertilizers

2015 ◽  
Vol 4 (5) ◽  
Author(s):  
Shashi Kant Shukla ◽  
Rajesh Kumar ◽  
Rohit Kumar Mishra ◽  
Anand Pandey ◽  
Ashutosh Pathak ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Plant Growth ◽  
Clinical Laboratory ◽  
Plant Growth Promoting Rhizobacteria ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Plant Growth Promoting Activities ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
The Impact

AbstractSeveral soil microbes are present in the rhizosphere zone, especially plant growth promoting rhizobacteria (PGPR), which are best known for their plant growth promoting activities. The present study reflects the effect of gold nanoparticles (GNPs) at various concentrations on the growth of PGPR. GNPs were synthesized chemically, by reduction of HAuCl4, and further characterized by UV-Vis spectroscopy, X-ray diffraction technique (XRD), and transmission electron microscopy (TEM), etc. The impact of GNPs on PGPR was investigated by Clinical Laboratory Standards Institute (CLSI) recommended Broth-Microdilution technique against four selected PGPR

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