Role of plant growth-promoting bacteria in sustainable agriculture

Pathania, Priyanka; Rajta, Ankita; Singh, Poonam; Bhatia, Ranjana

doi:10.1016/j.bcab.2020.101842

Cited by 83 publications

(38 citation statements)

References 127 publications

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“…The most commonly identified PSB belong to the genera of Pseudomonas, Rhizobium, Aspergillus, Bacillus, Staphyloccocus, Paenibacillus, and Penicillium (Suliasih and Widawati 2005;Hii et al 2020). Their distribution and diversity in the soil are influenced by factors such as soil type, total biomass, plant type, and nutrient accessibility (Tripathi et al 2012;Pathania et al 2020). Interestingly, Paenibacillus has the potential to not only able to solubilize phosphate but has nitrogen-fixation ability, antibacterial capacities, release siderophores, and producing indole acetic acid phytohormone (Grady et al 2016;Liu et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Isolation, identification, and characterization of phosphate solubilizing bacteria, Paenibacillus sp., from the soil of Danum Valley Tropical Rainforest, Sabah, Malaysia

et al. 2021

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While phosphorus (P) is a vital element for the plant to grow, only 0.1% of the phosphate soil is directly to be uptake by plants. Consequently, P fertilizer, which is mostly taken from unrenewable resources of phosphate rock, is practically added into the croplands. Nevertheless, as the demand for this fertilizer kept increasing, the availability of resources and environmental issues are currently raising wide concerns. Alternatively, soil phosphate solubilizing bacteria (PSB) is promising to be further developed as a biofertilizer to increase the availability of P elements for plants. This study aims to screen and characterize novel PSB from the tropical rainforest soil. The soil samples were collected from the Danum Valley tropical rainforest, Sabah. Phosphatase solubilizing bacteria were then screened using the NBRIP Agar selective media. The screening results yielded five colonies, designated as PSB1, PSB2, PSB3, PSB4, and PSB5, displaying halos, with an average diameter of 10mm. Further, 16s rRNA gene sequence analysis using BLASTn suggested that PSB1, PSB2, PSB3, PSB4, and PSB5 were designated as Bacillus sp. PSB01, Pseudomonas oryzyhabitans PSB02, Staphylococcus pasteuri PSB03, Paenibacillus sp. PSB04, and Staphylococcus pasteuri PSB05, respectively. Interestingly, the Paenibacillus group is a promising biofertilizer and is currently used in the global agriculture industry. Accordingly, Paenibacillus sp. PSB04 was then selected for further characterization using Gram staining and observed under scanning electron microscope (SEM). The Gram staining revealed that Paenibacillus sp. PSB04 is a Gram-negative bacterium with a rod shape, which is in good agreement with the SEM result. The specific phosphatase activity of the extracellular fraction of this bacterium was 7378.12 U mg-1 which is the highest activity compared to previous studies. This study provides an early insight into an excellent phosphate solubilizing bacterium for the agriculture industry obtained from Danum Valley.

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Section: Introductionmentioning

confidence: 99%

Isolation, identification, and characterization of phosphate solubilizing bacteria, Paenibacillus sp., from the soil of Danum Valley Tropical Rainforest, Sabah, Malaysia

et al. 2021

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“…No microorganisms were isolated from the fertilizer with action on soil (FS) formulated in liquid. In detail, no Trichoderma species were cultivated even if they were reported on the label confirming that some biostimulants available in the market are of poor quality due to the absence of microorganisms or to the choice of an inappropriate carrier (Pathania et al 2020 ). Moreover, the vitality of microorganisms could be affected by incorrect storage, handling and formulation (Singh and Nautiyal 2012 ; Pathania et al 2020 ).…”

Section: Resultsmentioning

confidence: 99%

Pathogenic potential of bacteria isolated from commercial biostimulants

et al. 2022

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Microbial-based products are a promising alternative to agrochemicals in sustainable agriculture. However, little is known about their impact on human health even if some of them, i.e., Bacillus and Paenibacillus species, have been increasingly implicated in different human diseases. In this study, 18 bacteria were isolated from 2 commercial biostimulants, and they were genotypically and phenotypically characterized to highlight specific virulence properties. Some isolated bacteria were identified as belonging to the genus Bacillus by BLAST and RDP analyses, a genus in-depth studied for plant growth-promoting ability. Moreover, 16S rRNA phylogenetic analysis showed that seven isolates grouped with Bacillus species while two and four clustered, respectively, with Neobacillus and Peribacillus. Unusually, bacterial strains belonging to Franconibacter and Stenotrophomonas were isolated from biostimulants. Although Bacillus species are generally considered nonpathogenic, most of the species have shown to swim, swarm, and produced biofilms, that can be related to bacterial virulence. The evaluation of toxins encoding genes revealed that five isolates had the potential ability to produce the enterotoxin T. In conclusion, the pathogenic potential of microorganisms included in commercial products should be deeply verified, in our opinion. The approach proposed in this study could help in this crucial step.

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“…On the other hand, PGPR is a very heterogeneous group of endophytic bacteria, which includes the phyla Proteobacteria, Firmicutes, Actinobacteria, and Bacteroidetes [ 26 ]. Among the innumerable genera, Aeromonas, Arthrobacter, Azospirillum, Azotobacter, Bacillus, Clostridium, Enterobacter, Gluconacetobacter, Klebsiella, Pseudomonas, Rhizobium , and Serratia are the most studied, mainly due to their wide diffusion [ 27 ]. PGPRs are found in the rhizosphere and are able to promote plant growth, with recent scientific evidence showing the importance of their role in enhancing soil productivity and tolerance to abiotic stress in plants [ 28 ].…”

Section: Plant Growth Promoting Microorganisms (Pgpms) and Their Biostimulant Activitymentioning

confidence: 99%

Microbial Biostimulants as Response to Modern Agriculture Needs: Composition, Role and Application of These Innovative Products

Castiglione

Mannino

Contartese³

et al. 2021

Plants

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An increasing need for a more sustainable agriculturally-productive system is required in order to preserve soil fertility and reduce soil biodiversity loss. Microbial biostimulants are innovative technologies able to ensure agricultural yield with high nutritional values, overcoming the negative effects derived from environmental changes. The aim of this review was to provide an overview on the research related to plant growth promoting microorganisms (PGPMs) used alone, in consortium, or in combination with organic matrices such as plant biostimulants (PBs). Moreover, the effectiveness and the role of microbial biostimulants as a biological tool to improve fruit quality and limit soil degradation is discussed. Finally, the increased use of these products requires the achievement of an accurate selection of beneficial microorganisms and consortia, and the ability to prepare for future agriculture challenges. Hence, the implementation of the microorganism positive list provided by EU (2019/1009), is desirable.

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Role of plant growth-promoting bacteria in sustainable agriculture

Cited by 83 publications

References 127 publications

Isolation, identification, and characterization of phosphate solubilizing bacteria, Paenibacillus sp., from the soil of Danum Valley Tropical Rainforest, Sabah, Malaysia

Isolation, identification, and characterization of phosphate solubilizing bacteria, Paenibacillus sp., from the soil of Danum Valley Tropical Rainforest, Sabah, Malaysia

Pathogenic potential of bacteria isolated from commercial biostimulants

Microbial Biostimulants as Response to Modern Agriculture Needs: Composition, Role and Application of These Innovative Products

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