Pragmatic role of microbial plant biostimulants in abiotic stress relief in crop plants

Ali, Sajid; Moon, Yong-Sun; Hamayun, Muhammad; Khan, Muhammad Aaqil; Bibi, Kalsoom; Lee, In‐Jung

doi:10.1080/17429145.2022.2091801

Cited by 70 publications

(27 citation statements)

References 77 publications

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“…In particular, the biological activity and growth-promoting effect of the studied Actinomycetes strains may be due to their ability to produce some bioactive metabolites, such as growth hormones, which enhance the tomato seedlings’ growth [ 26 , 27 , 28 , 29 ]. The application of microbial plant stimulants is considered an important strategy for sustainable agriculture systems for enhancing plant growth and increasing production, especially under abiotic stress [ 30 ].…”

Section: Discussionmentioning

confidence: 99%

Rhizospheric Actinomycetes Revealed Antifungal and Plant-Growth-Promoting Activities under Controlled Environment

Elshafie

Camele

2022

Plants

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Actinomycetes has large habitats and can be isolated from terrestrial soil, rhizospheres of plant roots, and marine sediments. Actinomycetes produce several bioactive secondary metabolites with antibacterial, antifungal, and antiviral properties. In this study, some Actinomycetes strains were isolated from the rhizosphere zone of four different plant species: rosemary, acacia, strawberry, and olive. The antagonistic activity of all isolates was screened in vitro against Escherichia coli and Bacillus megaterium. Isolates with the strongest bioactivity potential were selected and molecularly identified as Streptomyces sp., Streptomyces atratus, and Arthrobacter humicola. The growth-promoting activity of the selected Actinomycetes isolates was in vivo evaluated on tomato plants and for disease control against Sclerotinia sclerotiorum. The results demonstrated that all bacterized plants with the studied Actinomycetes isolates were able to promote the tomato seedlings’ growth, showing high values of ecophysiological parameters. In particular, the bacterized seedlings with Streptomyces sp. and A. humicola showed low disease incidence of S. sclerotiorum infection (0.3% and 0.2%, respectively), whereas those bacterized with S. atratus showed a moderate disease incidence (7.6%) compared with the positive control (36.8%). In addition, the ability of the studied Actinomycetes to produce extracellular hydrolytic enzymes was verified. The results showed that A. humicola was able to produce chitinase, glucanase, and protease, whereas Streptomyces sp. and S. atratus produced amylase and pectinase at high and moderate levels, respectively. This study highlights the value of the studied isolates in providing bioactive metabolites and extracellular hydrolytic enzymes, indicating their potential application as fungal-biocontrol agents.

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Section: Discussionmentioning

confidence: 99%

Rhizospheric Actinomycetes Revealed Antifungal and Plant-Growth-Promoting Activities under Controlled Environment

Elshafie

Camele

2022

Plants

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“…However, the increase in these flower's quality attributes of marigold was observed due to the sole and/or consortium inoculation with endophytic bacterial strains, which might be due to the ability of these bacteria to produce ACC-deaminase that reduces the ethylene level in plants and delay flower ripening (Moon and Ali, 2022). This ethylene reduction in plants by ACC-deaminase-producing bacteria is a critical property that enables interference with the physiological processes of the host plant (Eun et al, 2019;Ali et al, 2022). Various commercially available chemicals such as potassium permanganate, ultraviolet lamps, activated charcoal, and catalytic oxidizers inhibit the ethylene concentration in fruits and flowers to improve vase life (Ebrahimi et al, 2021).…”

Section: Endophytes Improve the Vase Life Of French Marigold Flowersmentioning

confidence: 99%

Plant-endophyte mediated improvement in physiological and bio-protective abilities of marigold (Tagetes patula)

Naveed

Hafeez²,

Rafique³

et al. 2022

Front. Plant Sci.

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Endophytic bacteria improve the growth, physiology, and metabolite profile of plants. They are known as potential biocontrol agents of soil-borne diseases. This study evaluated the effects of endophytic bacterial strains on growth, vase life, biochemical attributes, and antioxidant and nematicidal activities of French marigold (Tagetes patula). French marigold seeds were sole and consortium inoculated with three promising endophytic bacterial strains, Burkholderia phytofirmans (PsJN), Enterobacter sp. (MN17), and Bacillus sp. (MN54). The vase life of French marigold was promoted by 66.6% in the individual application of PsJN and 100% in plants treated with consortium compared to the uninoculated control. The shoot and root fresh weights were also increased by 65.9 and 68.7%, with the combined application of all three strains. The total phenolics, flavonoid, and protein contents were higher in consortium treatment with an increase of up to 38.0, 55.9, and 65.9%, respectively, compared to the uninoculated control. Furthermore, combined application of endophytic bacterial strains promoted DPPH radical scavenging, mortality of plant-parasitic nematodes, and ferric reducing antioxidant power activities with increase of up to 278.0, 103.8, and 178.0%, respectively, compared to uninoculated control. An increase in antioxidant activities of ascorbate peroxidase (APX), catalase (CAT), glutathione peroxidase (GPX), and superoxide dismutase (SOD) were observed up to 77.3, 86.0, 91.6, and 102.9%, respectively by combined application of endophytic bacterial strains. So, given the economic importance of floriculture crops, endophytic bacterial isolates studied here have shown a great potential for improving the productivity of cultivated ornamental French marigold.

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“…The growth promotion of crop plants is regulated by endophytes by providing plant growth regulators, N fixation, phosphate solubilization, and ACC deaminase activity and improving tolerance against plant biotic and abiotic stresses ( Carvalho et al, 2014 ). The application of PGP rhizobacteria (PPGPR) with plant growth-promoting traits is wanted due to its pragmatic, sustainable, and ecofriendly characteristics ( Ali et al, 2022 ; Moon and Ali, 2022 ). In fact, a lot of ACC deaminase enzyme secreting PGPR was reported to improve crop plants’ growth and development under various abiotic stress conditions ( Moon and Ali, 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Unveiling chlorpyrifos mineralizing and tomato plant-growth activities of Enterobacter sp. strain HSTU-ASh6 using biochemical tests, field experiments, genomics, and in silico analyses

et al. 2022

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The chlorpyrifos-mineralizing rice root endophyte Enterobacter sp. HSTU-ASh6 strain was identified, which enormously enhanced the growth of tomato plant under epiphytic conditions. The strain solubilizes phosphate and grew in nitrogen-free Jensen’s medium. It secreted indole acetic acid (IAA; 4.8 mg/mL) and ACC deaminase (0.0076 μg/mL/h) and hydrolyzed chlorpyrifos phosphodiester bonds into 3,5,6-trichloro-2-pyridinol and diethyl methyl-monophosphate, which was confirmed by Gas Chromatography – Tandem Mass Spectrometry (GC–MS/MS) analysis. In vitro and in silico (ANI, DDH, housekeeping genes and whole genome phylogenetic tree, and genome comparison) analyses confirmed that the strain belonged to a new species of Enterobacter. The annotated genome of strain HSTU-ASh6 revealed a sets of nitrogen-fixing, siderophore, acdS, and IAA producing, stress tolerance, phosphate metabolizing, and pesticide-degrading genes. The 3D structure of 28 potential model proteins that can degrade pesticides was validated, and virtual screening using 105 different pesticides revealed that the proteins exhibit strong catalytic interaction with organophosphorus pesticides. Selected docked complexes such as α/β hydrolase–crotoxyphos, carboxylesterase–coumaphos, α/β hydrolase–cypermethrin, α/β hydrolase–diazinon, and amidohydrolase–chlorpyrifos meet their catalytic triads in visualization, which showed stability in molecular dynamics simulation up to 100 ns. The foliar application of Enterobacter sp. strain HSTU-ASh6 on tomato plants significantly improved their growth and development at vegetative and reproductive stages in fields, resulting in fresh weight and dry weight was 1.8–2.0-fold and 1.3–1.6-fold higher in where urea application was cut by 70%, respectively. Therefore, the newly discovered chlorpyrifos-degrading species Enterobacter sp. HSTU-ASh6 could be used as a smart biofertilizer component for sustainable tomato cultivation.

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Pragmatic role of microbial plant biostimulants in abiotic stress relief in crop plants

Cited by 70 publications

References 77 publications

Rhizospheric Actinomycetes Revealed Antifungal and Plant-Growth-Promoting Activities under Controlled Environment

Rhizospheric Actinomycetes Revealed Antifungal and Plant-Growth-Promoting Activities under Controlled Environment

Plant-endophyte mediated improvement in physiological and bio-protective abilities of marigold (Tagetes patula)

Unveiling chlorpyrifos mineralizing and tomato plant-growth activities of Enterobacter sp. strain HSTU-ASh6 using biochemical tests, field experiments, genomics, and in silico analyses

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