Rhizospheric Microbiomes: Biodiversity, Mechanisms of Plant Growth Promotion, and Biotechnological Applications for Sustainable Agriculture

Kour, Divjot; Rana, Kusam Lata; Yadav, Neelam; Yadav, Ajar Nath; Kumar, Ashok; Meena, Vijay Singh; Singh, Balveer; Chauhan, Vinay; Dhaliwal, H. S.; Saxena, Anil Kumar

doi:10.1007/978-981-13-7553-8_2

Cited by 129 publications

(55 citation statements)

References 188 publications

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“…Most of the work oriented toward the search for metallotolerant PGPR bacteria are usually oriented toward specific bacterial genera, such as Bacillus [ 32 ], Azotobacter [ 33 ], or Pseudomonas [ 34 ], among others. Additionally, in almost all cases the origin of isolation is that of plants for agricultural use [ 35 , 36 , 37 ], maximizing the probability of selection of strains with potential biotechnological use due to the selective pressure of the heavy metal and the coevolution/coadaptation with the plant.…”

Section: Discussionmentioning

confidence: 99%

Bio-Mercury Remediation Suitability Index: A Novel Proposal That Compiles the PGPR Features of Bacterial Strains and Its Potential Use in Phytoremediation

Mora

Jiménez

González

et al. 2021

IJERPH

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Soil pollution from heavy metals, especially mercury, is an environmental problem for human health. Biological approaches offer interesting tools, which necessarily involve the selection of organisms capable of transforming the environment via bioremediation. To evaluate the potential use of microorganisms in phytorhizoremediation, bacterial strains were isolated from rhizospheric and bulk soil under conditions of chronic natural mercury, which were identified and characterized by studying the following: (i) their plant growth promoting rhizobacteria (PGPR) activities; and (ii) their maximum bactericide concentration of mercury. Information regarding auxin production, phosphate solubilization, siderophore synthesis and 1-aminocyclopropane-1-carboxylic acid deaminase (ACCd) capacity of the isolates was compiled in order to select the strains that fit potential biotechnological use. To achieve this objective, the present work proposes the Bio-Mercury Remediation Suitability Index (BMR-SI), which reflects the integral behavior of the strains for heavy metal polluted soil bioremediation. Only those strains that rigorously fulfilled all of the established criteria were selected for further assays.

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Section: Discussionmentioning

confidence: 99%

Bio-Mercury Remediation Suitability Index: A Novel Proposal That Compiles the PGPR Features of Bacterial Strains and Its Potential Use in Phytoremediation

Mora

Jiménez

González

et al. 2021

IJERPH

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show abstract

“…Most of the studies that have focused on the search for metallotolerant PGPR bacteria have generally been oriented toward specific bacterial genera, such as Bacillus [ 24 ], Azotobacter [ 25 ], or Pseudomonas [ 26 ], among others. The source of isolation is usually plants for agricultural use [ 27 , 28 , 29 ] since wild plants are rarely studied for isolation [ 19 ]. In the study herein, native plants from the Almadén mining district were used as a source of isolation, thereby maximizing the probability of selecting strains with potential biotechnological use due to the selective pressure of the heavy metal and the co-evolution/coadaptation with the plant.…”

Section: Discussionmentioning

confidence: 99%

Selection of Mercury-Resistant PGPR Strains Using the BMRSI for Bioremediation Purposes

González

Mora

Probanza

et al. 2021

IJERPH

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Heavy metal pollution of soil, particularly by mercury (Hg), is a problem that can seriously affect the environment and human health. For this reason, it is necessary to take steps to remediate these environments, prevent potential adverse effects, and restore these areas for subsequent use in agriculture, industry, ranching, and forestry. The present study has selected 40 bacterial strains from rhizosphere and bulk soil that grow naturally in high Hg-contaminated soils from the Almadén mining district in Ciudad Real, Spain. With the objective of evaluating the potential use of these strains in phyto-rhizoremediation, an evaluation and statistical analysis of their PGPR (Plant-Growth-Promoting Rhizobacteria) activity at different levels of Hg was carried out as the first condition of selection for their potential use in bioremediation. In addition, a Hg MBC (Maximum Bactericidal Concentration) was performed with the aim of selecting the strains with high Hg tolerance. Finally, strains with potential biotechnological use have been proposed according to the Bio-Mercury Remediation Suitability Index (BMRSI) criteria, which consider indole-3-acetic acid (IAA) production, acid 1- aminocyclopropane-1-carboxylic deaminase (ACCd) activity, phosphates solubilization, and siderophore production measured in the presence of Hg, as well as its MBC to Hg. The strains selected for further in vivo and in situ processes must reach at least an MBC (Hg) > 100 μg/mL and BMRSI ≥ 6.5.

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“…The role of plant growth promotion microbes can be grouped into direct and indirect. Direct mechanisms include nitrogen xation, phosphate solubilization, bio lm production, and IAA production while indirect mechanisms include cell wall degrading enzyme production, ammonia production, HCN production and antibiosis 46 .…”

Section: Discussionmentioning

confidence: 99%

Characterization and Diversity of plant growth promoting Endophytic and Rhizosphere Bacteria isolated from theRhizosphere and tissues of Pepper and their effect on plant growth promotion and disease suppression of Phytophthora capsici

Admassie

Wold-Hawariat

Alemu

2021

Preprint

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Plant growth promoting rhizo and endophytic bacteria were isolated from different parts of pepper from south eastern Ethiopia. Plant growth promoting bacteria (PGP) are those that may be used to promote plant growth and suppress plant diseases. The objectives of this study were to identify and characterize PGPB indigenous to pepper rhizosphere and endophyte bacteria in Ethiopia, and to determine their capacity to suppress Phytophthora capsici in pepper. From a total of 60 isolates, 20 were selected based on their in vitro antagonism activity of phytopathogens and plant growth promoting traits. From the total 60 strains representing, 38 rhizosphere, and 22 endophytic bacteria were identified based on biochemical assays of semi-automated Vitec 2 compact and ten potential bacteria further identified by molecular methods. Results revealed that only one isolate of rhizosphere and three endophytic bacteria showed more than 50% suppression of test pathogens. The isolates were evaluated for their ability to solubilize phosphate, as well as for ammonia, indole acetic acid, hydrogen cyanide, and biofilm production. The selected isolates produced (0.2–93 µg mL− 1) of indole-3-acetic acid, without supplemented with tryptophan, while supplemented with tryptophan it produces (11.23–159 µg mL− 1). The activities of plant growth-promoting were assessed by measuring their effect on the number of lateral roots, root and shoot length of Arabidopsis plants, and germination percentage of pepper plants. Pepper plants grown from seeds that were treated with these PGPB strains showed significantly higher levels of germination, seedling vigor, and growth, compared to non-treated control plants. Since these PGPB inoculants showed multiple characters useful to the host plants, they may be used as an alternative in the production of new, safe, and effective seed treatments as bio-fungicides. Generally, this work exhibits the potential of bacterial isolates to control Phytophthora infection and promote plant growth.

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Rhizospheric Microbiomes: Biodiversity, Mechanisms of Plant Growth Promotion, and Biotechnological Applications for Sustainable Agriculture

Cited by 129 publications

References 188 publications

Bio-Mercury Remediation Suitability Index: A Novel Proposal That Compiles the PGPR Features of Bacterial Strains and Its Potential Use in Phytoremediation

Bio-Mercury Remediation Suitability Index: A Novel Proposal That Compiles the PGPR Features of Bacterial Strains and Its Potential Use in Phytoremediation

Selection of Mercury-Resistant PGPR Strains Using the BMRSI for Bioremediation Purposes

Characterization and Diversity of plant growth promoting Endophytic and Rhizosphere Bacteria isolated from theRhizosphere and tissues of Pepper and their effect on plant growth promotion and disease suppression of Phytophthora capsici

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