scholarly journals The role of abiotic factors modulating the plant-microbe-soil interactions: toward sustainable agriculture. A review

2017 ◽  
Vol 15 (1) ◽  
pp. e03R01 ◽  
Author(s):  
Gustavo Santoyo ◽  
Claudia Hernández-Pacheco ◽  
Julie Hernández-Salmerón ◽  
Rocio Hernández-León
Keyword(s):  
Plant Growth ◽  
Abiotic Factors ◽  
Plant Growth Promoting Rhizobacteria ◽  
Climatic Conditions ◽  
Co2 Production ◽  
Soil Microbial Diversity ◽  
Soil Microbial ◽  
Rhizosphere Microbiome ◽  
Plant Growth Promoting ◽  
The Impact

Microbial soil communities are active players in the biogeochemical cycles, impacting soil fertility and interacting with aboveground organisms. Although soil microbial diversity has been studied in good detail, the factors that modulate its structure are still relatively unclear, especially the environmental factors. Several abiotic elements may play a key role in modulating the diversity of soil microbes, including those inhabiting the rhizosphere (known as the rhizosphere microbiome). This review summarizes relevant and recent studies that have investigated the abiotic factors at different scales, such as pH, temperature, soil type, and geographic and climatic conditions, that modulate the bulk soil and rhizosphere microbiome, as well as their indirect effects on plant health and development. The plant–microbiome interactions and potential benefits of plant growth-promoting rhizobacteria are also discussed. In the last part of this review, we highlight the impact of climate change on soil microorganisms via global temperature changes and increases in ultraviolet radiation and CO2 production. Finally, we propose the need to understand the function of soil and rhizospheric ecosystems in greater detail, in order to effectively manipulate or engineer the rhizosphere microbiome to improve plant growth in agricultural production.

scholarly journals Technologies for the Selection, Culture and Metabolic Profiling of Unique Rhizosphere Microorganisms for Natural Product Discovery

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1955 ◽  
Author(s):  
Saliya Gurusinghe ◽  
Tabin L. Brooks ◽  
Russell A. Barrow ◽  
Xiaocheng Zhu ◽  
Agasthya Thotagamuwa ◽  
...  
Keyword(s):  
Microbial Diversity ◽  
Metabolic Profiling ◽  
Plant Growth Promoting Rhizobacteria ◽  
Microbial Culture ◽  
Culture Methods ◽  
Soil Microbial Diversity ◽  
Soil Microbial ◽  
Molecular Features ◽  
Successful Recovery ◽  
Plant Growth Promoting

Small molecule discovery has benefitted from the development of technologies that have aided in the culture and identification of soil microorganisms and the subsequent analysis of their respective metabolomes. We report herein on the use of both culture dependent and independent approaches for evaluation of soil microbial diversity in the rhizosphere of canola, a crop known to support a diverse microbiome, including plant growth promoting rhizobacteria. Initial screening of rhizosphere soils showed that microbial diversity, particularly bacterial, was greatest at crop maturity; therefore organismal recovery was attempted with soil collected at canola harvest. Two standard media (Mueller Hinton and gellan gum) were evaluated following inoculation with soil aqueous suspensions and compared with a novel “rhizochip” prototype buried in a living canola crop rhizosphere for microbial culture in situ. Following successful recovery and identification of 375 rhizosphere microbiota of interest from all culture methods, isolates were identified by Sanger sequencing and/or characterization using morphological and biochemical traits. Three bacterial isolates of interest were randomly selected as case studies for intensive metabolic profiling. After successful culture in liquid media and solvent extraction, individual extracts were subjected to evaluation by UHPLC-DAD-QToF-MS, resulting in the rapid characterization of metabolites of interest from cultures of two isolates. After evaluation of key molecular features, unique or unusual bacterial metabolites were annotated and are reported herein.

scholarly journals Interactions Between Bacillus Spp., Pseudomonas Spp. and Cannabis sativa Promote Plant Growth

2021 ◽  
Vol 12 ◽  
Author(s):  
Dominique Comeau ◽  
Carole Balthazar ◽  
Amy Novinscak ◽  
Nadia Bouhamdani ◽  
David L. Joly ◽  
...  
Keyword(s):  
Plant Growth ◽  
Cannabis Sativa ◽  
Growth Promotion ◽  
Genomic Analysis ◽  
Plant Growth Promoting Rhizobacteria ◽  
Growth And Yield ◽  
Promoting Effect ◽  
Rhizosphere Microbiome ◽  
Growth Promoting ◽  
The Impact

Plant growth-promoting rhizobacteria (PGPR) deploy several mechanisms to improve plant health, growth and yield. The aim of this study was to evaluate the efficacy of two Pseudomonas spp. strains and three Bacillus spp. strains used as single treatments and in consortia to improve the yield of Cannabis sativa and characterize the impact of these treatments on the diversity, structure and functions of the rhizosphere microbiome. Herein, we demonstrate a significant C. sativa yield increase up to 70% when inoculated with three different Pseudomonas spp./Bacillus spp. consortia but not with single inoculation treatments. This growth-promoting effect was observed in two different commercial soil substrates commonly used to grow cannabis: Promix and Canna coco. Marker-based genomic analysis highlighted Bacillus spp. as the main modulator of the rhizosphere microbiome diversity and Pseudomonas spp. as being strongly associated with plant growth promotion. We describe an increase abundance of predicted PGPR metabolic pathways linked with growth-promoting interactions in C. sativa.

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 Impact of Soil Salinity on the Cowpea Nodule-Microbiome and the Isolation of Halotolerant PGPR Strains to Promote Plant Growth under Salinity Stress

2020 ◽  
Vol 4 (4) ◽  
pp. 364-374
Author(s):  
Salma Mukhtar ◽  
Ann M. Hirsch ◽  
Noor Khan ◽  
Kauser A. Malik ◽  
Ethan A. Humm ◽  
...  
Keyword(s):  
Plant Growth ◽  
Salinity Stress ◽  
Environmental Dna ◽  
Plant Growth Promoting Rhizobacteria ◽  
Soil Samples ◽  
Soil Microbial ◽  
Native Soil ◽  
Plant Growth Promoting ◽  
Trap Plants ◽  
Promote Plant Growth

Cowpea is one of the major legumes cultivated in arid and semiarid regions of the world. Four soil-microbial samples (SS-1 through SS-4) collected from semiarid soils in Punjab, Pakistan were planted with cowpea (Vigna unguiculata) crops, which were grown under salinity stress to analyze bacterial composition in the rhizosphere and within nodules using cultivation-dependent and -independent methods. Two varieties, 603 and the salt-tolerant CB 46, were each inoculated with or without the four different native soil samples or grown in medium either N-deficient (−N) or supplemented with N (+N). Plants inoculated with soil samples SS-2 and SS-4 grew better than plants inoculated with SS-1- and SS-3 and grew comparably with the +N controls. Environmental DNA (eDNA) was isolated from SS-1 and SS-4, and, by 16S ribosomal RNA sequencing, the soil microbiomes consisted mainly of Actinobacteria, Firmicutes, Proteobacteria, and other nonproteobacterial genera. However, analysis of eDNA isolated from cowpea nodules established by the trap plants showed that the nodule microbiome consisted almost exclusively of proteobacterial sequences, particularly species of Bradyrhizobium. Bacteria were isolated from both soils and nodules, and 34 of the 51 isolates tested positive for plant-growth-promoting rhizobacteria traits in plate assays. Many could serve as future inocula for crops in arid soils. The discrepancy between the types of bacteria isolated by culturing bacteria isolated from surface-sterilized cowpea nodules (proteobacteria and nonproteobacteria) versus those detected by sequencing DNA isolated from the nodules (proteobacteria) from cowpea nodules (proteobacteria and nonproteobacteria) versus those detected in the nodule microbiome (proteobacteria) needs further study.

scholarly journals Impact of plant growth-promoting rhizobacteria on yield and disease control of Nicotiana tabacum

2018 ◽  
Vol 70 (4) ◽  
pp. 717-725
Author(s):  
Sohail Khan ◽  
Fazli Subhan ◽  
Kashif Haleem ◽  
Muhammad Khattak ◽  
Ibrar Khan ◽  
...  
Keyword(s):  
Nicotiana Tabacum ◽  
Plant Growth ◽  
Plant Growth Promoting Rhizobacteria ◽  
Growth And Yield ◽  
Vitro Assay ◽  
Soil Microbial ◽  
Auxin Production ◽  
Plant Growth Promoting ◽  
Growth Promoting

An unexplored soil microbial community associated with the root system of Nicotiana tabacum was isolated to analyze its impact on growth and yield of the crop. A total of nine isolates out of 180 were biochemically screened and characterized as potential plant growth-promoting rhizobacteria due to the expression of growth-promoting traits. All isolates were positive for ammonia production, 8 were positive for phosphate solubilization but none for auxin production. The majority of the isolates were also found positive for hydrogen cyanide, siderophore and hydrolytic/degradative enzymes production, enabling them to restrict the growth of Fusarium oxysporum in an in vitro assay. Although all tested isolates enhanced tobacco growth significantly, Baj-ER-01 and CD-RS-03 were found to be the most promising in enhancing all aspects of growth. This study provides evidence for the enhancement of growth and yield of inoculated tobacco plants through an adequate supply of nutrients and/or controlling phytopathogens.

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.

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