Microbial endophytes: application towards sustainable agriculture and food security

Dwibedi, Vagish; Rath, Santosh Kumar; Joshi, Mahavir; Kaur, Rajinder; Kaur, Gurleen; Singh, Devinder; Kaur, Gagandeep; Kaur, Sukhminderjit

doi:10.1007/s00253-022-12078-8

Cited by 31 publications

(13 citation statements)

References 169 publications

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“…Our results suggest that inoculants based on non-rhizobial nodule endophytes could be useful and efficient tools to enhance legume adaptation and growth in metal contaminated and nutrient-poor soils. At least under stress conditions, endophytes could provide some advantages as PGPB compared to rhizospheric bacteria, in addition to their narrower relationship with the plant and the lack of competence with soil bacteria ( Adeleke and Babalola, 2021 ; Dwibedi et al, 2022 ). In that way, it looks necessary to investigate microbiomes of a wide diversity of nitrogen-fixing nodules to find useful inoculants to be applied in different environmental conditions ( Martínez-Hidalgo and Hirsch, 2017 ).…”

Section: Discussionmentioning

confidence: 99%

“…These bacteria were isolated from the rhizosphere of different legumes growing in estuarine soils with low levels of minerals and organic matter. It is well accepted that endophytes maintain a much closer relationship with the plant and have lower competition with soil microorganisms than rizospheric bacteria ( Adeleke and Babalola, 2021 ; Dwibedi et al, 2022 ). The present work is aimed to determine whether a consortium of endophytes isolated from nodules could enhance legume growth in degraded soils more efficiently than rhizosphere bacteria, introducing soil metal contamination as additional stress.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced legume growth and adaptation to degraded estuarine soils using Pseudomonas sp. nodule endophytes

et al. 2022

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The joint estuary of Tinto and Odiel rivers (SW Spain) is one of the most degraded and polluted areas in the world and its recovery is mandatory. Legumes and their associated bacteria are recommended sustainable tools to fight against soils degradation and loss of fertility due to their known positive impacts on soils. The aim of this work was to isolate and characterize plant growth promoting nodule endophytes (PGPNE) from inside nodules of Medicago spp. naturally growing in the estuary of the Tinto and Odiel Rivers and evaluate their ability to promote legume adaptation in degraded soils. The best rhizobia and non-rhizobia among 33 endophytes were selected based on their plant growth promoting properties and bacterial enzymatic activities. These strains, identified as Pseudomonas sp. N4, Pseudomonas sp. N8, Ensifer sp. N10 and Ensifer sp. N12, were used for in vitro studies using Medicago sativa plants. The effects of individual or combined inoculation on seed germination, plant growth and nodulation were studied, both on plates and pots containing nutrient-poor soils and moderately contaminated with metals/loids from the estuary. In general, inoculation with combinations of rhizobia and Pseudomonas increased plant biomass (up to 1.5-fold) and nodules number (up to 2-fold) compared to single inoculation with rhizobia, ameliorating the physiological state of the plants and helping to regulate plant stress mechanisms. The greatest benefits were observed in plants inoculated with the consortium containing the four strains. In addition, combined inoculation with Ensifer and Pseudomonas increased As and metals accumulation in plant roots, without significant differences in shoot metal accumulation. These results suggest that PGPNE are useful biotools to promote legume growth and phytostabilization potential in nutrient-poor and/or metals contaminated estuarine soils.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced legume growth and adaptation to degraded estuarine soils using Pseudomonas sp. nodule endophytes

et al. 2022

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“…Moreover, while endophytic PGPB are attracted to a specific plant’s root exudates [ 19 , 20 ] and enter the plant through the roots, many of these bacteria are motile and can travel through the plant to other tissues such as leaves and stems (where they are generally found in lower concentration than in the plant roots). In addition, various plant species and subspecies, plant organs and different stages of plant growth exude a different range of small organic molecules, and therefore, attract different bacteria [ 21 ]. Consequently, different tissues within the same plant may contain different groups of bacterial (and fungal) endophytes [ 22 ].…”

Section: Plant Bacterial Endophytesmentioning

confidence: 99%

Secondary Metabolites Produced by Plant Growth-Promoting Bacterial Endophytes

Narayanan

Glick

2022

Microorganisms

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There is an increasing interest in the use of beneficial microorganisms as alternatives to chemically synthesized or plant-derived molecules to produce therapeutic agents. Bacterial endophytes are plant-associated microorganisms that can colonize different parts of living plants without causing any diseases. Diverse endophytic bacteria possess the ability to synthesize a wide range of secondary metabolites with unique chemical structures that have been exploited for their anti-microbial, antiviral, anti-cancer, and anti-inflammatory properties. Additionally, production of these bioactive compounds can also benefit the host plant as they may play a significant role in a plant’s interaction with the environment for adaptation and defense. As a result of their significant impact as curative compounds or as precursors to produce new drugs, the biotechnological possibilities of secondary metabolites derived from endophytic bacteria are immense.

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“…The intended microorganisms are characterized by being beneficial to plants, e.g., plant growth-promoting bacteria which are employed as biofertilizers, biocontrol agents, and pollutant bioremediators [ 6 , 7 ]. Plant growth-promoting bacteria facilitate and enhance plant growth processes via direct and indirect mechanisms [ 8 ]. Direct stimulation involves nitrogen fixation, production of phytohormones such as auxins, cytokinins, and gibberellins, solubilization of nutrients such as phosphate, and siderophore production [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Brevibacillus DesertYSK and Rhizobium MAP7 stimulate the growth and pigmentation of Lactuca sativa L.

Mowafy

Khalifa

Elsayed

2023

Journal of Genetic Engineering and Biotechnology

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Background Applying microbial biostimulants during crop cultivation allows for higher sustainability levels. It reduces the need for fertilizers and environmental contaminants while enhancing plant quality. This study assessed 13 endophytic bacteria, 4 newly isolated, and 9 donated, for plant growth-promoting capabilities. Quantitative assessments of indole acetic acid (IAA), gibberellic acid (GA3), siderophores, ammonia, exopolysaccharides, volatile HCN, and phosphate solubilization, along with Bray–Curtis cluster analyses were performed. Results Upon the results we selected RhizobiumMAP7, Brevibacillus DesertYSK, Pseudomonas MAP8, BacillusMAP3, Brevibacillus MAP, and Bacillus DeltaYSK to evaluate their effects on Lactuca sativa growth and pigmentation in a 30-day greenhouse pot experiment. Both Brevibacillus DesertYSK and Rhizobium MAP7surpassed other strains in growth promotional effects. They doubled shoot length (12 and 12.3 cm, respectively, when compared with 7 cm for control after 30 days), and fresh weight (0.079 and 0.084 g, respectively, when compared with 0.045 g for control after 30 days), and increased root length by at least 3-fold when compared with control (4.5 and 3.5 cm, respectively, when compared with 1.2 cm for control after 30 days). Chlorophyll content also exhibited at least a 2-fold significant increase in response to bacterization compared with control. Conclusions This strain superiority was consistent with the in vitro assays data that showed strains capability as IAA and GA3producers. Also, strains were highly capable ammonia and siderophore producers and phosphate solubilizers, providing considerable hormone and nutrient levels for L. sativa plantsleading to improved growth parameters and appearance. These data support the notion that nodule-based bacteria are potential plant growth-promoting bacteria (PGPB) that may be used on a wider scale rather than just for legumes.

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Microbial endophytes: application towards sustainable agriculture and food security

Cited by 31 publications

References 169 publications

Enhanced legume growth and adaptation to degraded estuarine soils using Pseudomonas sp. nodule endophytes

Enhanced legume growth and adaptation to degraded estuarine soils using Pseudomonas sp. nodule endophytes

Secondary Metabolites Produced by Plant Growth-Promoting Bacterial Endophytes

Brevibacillus DesertYSK and Rhizobium MAP7 stimulate the growth and pigmentation of Lactuca sativa L.

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